Designation: B94 − 13
Standard Specification for
Magnesium-Alloy Die Castings1 This standard is issued under the fixed designation B94; the number immediately following the designation indicates the year of original adoption adopt ion or, in the case of revis revision, ion, the year of last revision. A number in parentheses parentheses indicates indicates the year of last reapproval. reapproval. A super superscrip scriptt epsilon (´) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.
1. Sco Scope* pe* 1.1 This specification specification covers magnesium-allo magnesium-alloy y die casting castings. s. Current alloy compositions are specified under the designations shown in Table in Table 1. 1. 2 1.2 The values stated in inch-pound inch-pound units are standard. The SI values in parentheses are provided for information only. 1.3 This standar standard d doe doess not purport purport to add addre ress ss all of the safet sa fetyy co conc ncer erns ns,, if an anyy, as asso socia ciate ted d wi with th its us use. e. It is th thee responsibility of the user of this standard to establish appro priate safety and health practices and determine the applicability of regulatory limitations prior to use. 2. Referenc Referenced ed Documents Documents 2.1 The following following documents documents of the issue in effect effect on date of ord order er acce accepta ptance nce form a par partt of thi thiss spe specific cificatio ation n to the extent refer referenced enced herein herein:: 3
2.2 ASTM Standards: B93/B93M Spe B93/B93M Specifi cificati cation on for Mag Magnes nesium ium Allo Alloys ys in Ing Ingot ot Form for Sand Castings, Permanent Mold Castings, and Die Castings B557 Test B557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products B660 Pra B660 Practic ctices es for Pac Packag kaging ing/Pa /Packin cking g of Alu Alumin minum um and Magnesium Products B951 Practice B951 Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast Wrought B953 B953 Pra Practic cticee for Sam Samplin pling gand Magnes Mag nesium ium and Mag Magnes nesium ium Alloys for Spectrochemical Analysis B954 Test B954 Test Method for Analysis of Magnesium and Magnesium Alloys by Atomic Emission Spectrometry
1
This specification is under the jurisdiction of ASTM Committee B07 Committee B07 on Light Metals and Alloys and is the direct responsibilit Metals responsibility y of Subc Subcommitt ommittee ee B07.04 on Magnesium Alloy Cast and Wrought Products. Curren Cur rentt edi editio tion n app approv roved ed May 1, 201 2013. 3. Pub Publis lished hed Jun Junee 201 2013. 3. Ori Origin ginall ally y approv app roved ed in 193 1934. 4. Las Lastt pre previo vious us edi editio tion n app approv roved ed in 200 2007 7 as B94 – 07. 07. DOI DOI:: 10.1520/B0094-13. 2 SAE specifications No. 501 and 501A conform to the requirements for Alloy AZ91A and AZ91B respectively. 3 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at
[email protected]. For Annual Book of ASTM Standards volume information, refer to the standard’s Document Summary page on the ASTM website.
E23 Test Methods for Notched Bar Impact Testing of MeE23 tallic Materials E29 Pra E29 Practic cticee for Usi Using ng Sig Signifi nifican cantt Dig Digits its in Test Data to Determine Conformance with Specifications E88 Practice E88 Practice for Samplin Sampling g Nonf Nonferrou errouss Metals and Alloys in Cast Form for Determination of Chemical Composition E505 Referen E505 Reference ce Radiog Radiographs raphs for Inspe Inspection ction of Aluminum and Magnesium Die Castings E527 Pr E527 Prac actic ticee fo forr Nu Numb mber erin ing g Me Metal talss an and d Al Allo loys ys in th thee Unified Numbering System (UNS) 2.3 American Die Casting Institute:3 “E” Series Product Standards 2.4 Federal Standards:4 FED-STD-123 Marking FED-STD-123 Marking for Shipment (Civil Agencies) SAE AMS-STD-184 Identification Marking of Aluminum, Magnesium and Titanium 2.5 Military Standard:4 MIL-STD-129 Marking MIL-STD-129 Marking for Shipment and Storage 3. Terminology 3.1 Definitions: 3.1.1 die casting— a metal object produced by the introduction of molten metal under substantial pressure into a metal die and characterized by a high degree of fidelity to the die cavity. 4. Order Ordering ing Information Information 4.1 Order Orderss for die castings shall include include the following basic information: 4.1.1 This specification specification number number and date, 4.1.2 Quant Quantity ity and delivery schedule, schedule, as requir required, ed, 4.1.3 Part name and number, number, 4.1.4 4.1 .4 All Alloy oy (Table (Table 1), 1), and 4.1.5 4.1 .5 Drawing Drawing of die cas casting ting,, whe when n req requir uired, ed, giv giving ing all necessary dimensions and showing latest revisions and allowances for machining, if any. Location of ejector pin marks or parting par ting lines shall be at the opt option ion of the pro produc ducer er,, unl unless ess specifically designated on the drawing.
4
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B94 − 13 TABLE 1 Chemical RequirementsA,B ,C ,D Alloy B
Designation
Composition, % UNS
Aluminum
Manganese Ma
Rare Earth
Strontium
Zinc
Copper, max
Iron, max
AS41A
M10410
3.5-5.0
0.20-0.50
. .. ..
...
0.12
0.06
...
AS41B
M10412
3.5-5.0
0.35-0.7E
...
...
0.12
0.02
0.0035E
AM50A AM60A AM60B AZ91A
M10500 M10600 M10602 M11910
4.4-5.4 5.5-6.5 5.5-6.5 8.3-9.7
0.26-0.6E 0.13-0.6 0.24-0.6E 0.13-0.50
... ... ... . .. ..
... ... ... ...
0.010 0.35 0.010 0.10
AZ91B
M11912
8.3-9.7
0.13-0.50
. .. ..
...
AZ91D
M11916
8.3-9.7
...
...
AJ52AF AJ62AF AS21A AS21BF
M17520 M17620 M10210 M10212
4.5-5.5 5.5-6.6 1.8-2.5 1.8-2.5
0.150.50E 0.24-0.6E 0.24-0.6E 0.18-0.7 0.05-0.15
... ... ... 0.060.25
1.7-2.3 2.0-2.8 ... ...
0.22 0.22 0.22 0.351.0 0.351.0 0.351.0 0.22 0.22 0.20 0.25
Silicon
Nickel
Other Metallic Impurities, max, each
Magnesium
0.03
...
remainder
0.002
0.02
remainder
0.004E 0. ... 0.005E 0. ...
0.501.5 0.501.5 0.10 0.50 0.10 0.50
0.002 0.03 0.002 0.03
0.02 ... 0.02 ...
remainder remainder remainder remainder
0.35
...
0.50
0.03
...
remainder
0.030
0.005E
0.10
0.002
0.02
remainder
0.010 0.010 0.01 0.008
0.004E 0.004E 0.005 0.0035
0.10 0.10 0.7-1.2 0.7-1.2 0.
0.001 0.001 0.001 0.001
0.01 0.01 0.01 0.01
remainder remainder remainder remainder
A
Analysis shall regularly be made only for the elements specifically mentioned in this table. If, however, the presence of other elements is suspected or indicated in the course of routine analysis, further analysis shall be made to determine that these other elements are not in excess of 0.3 %. B The following applies to all specified limits in this table: For purposes of acceptance and rejection an observed value or a calculated value obtained from analysis should be rounded to the nearest unit in the last right-hand place of figures used in expressing the specified limit in accordance with the rounding procedure prescribed in Section 3 of Practice E29 Practice E29.. C Where single units are shown, these indicate the maximu maximum m amount amounts s permi permitted. tted. D ASTM alloy design designations ations were establ established ished in accord accordance ance with Practi Practice ce B951 B951,, UNS design designations ations were establ established ished in accord accordance ance with Practi Practice ce E527 E527.. E In alloys AS41B,AM50A, AJ52A,AM60B, AJ62A, and AZ91D, if either the minimum minimum manganese manganese limit or the maximum iron limit is not met, then the iron/manganese iron/manganese ratio shall not exceed 0.010, 0.015, 0.015, 0.021, 0.021, and 0.032, respectively. F Alloys AJ52A, AJ62A, AJ62A, and AS21B are patented compos compositions itions for elevat elevated ed temper temperature ature applications. applications. Interested parties are invite invited d to submit information information regard regarding ing the identification of alternatives to these compositions to ASTM International. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. standa rd. Users of this standard are expressly advised advised that determ determinatio ination n of the validity of any such patent rights, and the risk of infrin infringement gement of such rights rights,, are entire entirely ly their own responsibility.
Additional ional tests, options, options, and specia speciall inspection requirerequire4.2 Addit ments as provided below should be justified only on the basis of need. These shall be specified in the contract or purchase order, as additional procedures and extended delivery time may be invol involved. ved. 4.2.1 Chemica Chemicall analysis analysis (7.1.1 7.1.1), ), 4.2.2 Quality assurance assurance (Section (Section 6), 4.2.3 Special proof tests or mechan mechanical ical properties properties (Section 8), 4.2.4 Genera Generall quality options for internal soundness soundness or for finish (Sectio (Section n 10 10), ), 4.2.5 Sourc Sourcee inspection (Section (Section 11 11), ), 4.2.6 Certifica Certification tion (Section (Section 12 12)), 4.2.7 Markin Marking g for identification identification (Section (Section 14 14), ), and 4.2.8 Special packaging packaging (Section (Section 15 15). ). 5. Mate Material rialss 5.1 The magnesium magnesium alloys used for the manufacture manufacture of die castin cas tings gs sh shall all be su such ch th that at th thee di diee ca casti sting ngss pr prod oduc uced ed wi will ll confor con form m to the che chemica micall com compos positio ition n req requir uireme ements nts of thi thiss specific spe cificatio ation. n. Ing Ingot ot in acc accord ordanc ancee with Spe Specifi cificati cation on B93/ B93M may be used but is not restricted to this source. B93M
sible for the per sible perfor forman mance ce of all ins inspec pectio tion n and test req requir uireements specified herein. Except as otherwise specified in the contract or order, the producer or supplier may use his own or any other suitable facilities for the performance of the inspection and test requirements specified herein, unless disapproved by the purchaser. The purchaser shall have the right to perform any of the inspections and tests set forth in this specification. Quality assurance standards shall be agreed upon between the producer or supplier and purchaser at the time a contract or order is placed. 6.2 Lot Definit inspection lot sha shall ll be defi defined ned as Definition— ion— An inspection follows: 6.2.1 An inspection inspection lot shall consist consist of the production production from each ea ch di diee or compou compound nd di diee on each machin machinee fo forr ea each ch 24 h during the first week of normal operation and the production for each 48 h thereafter of normal operation. Any significant change cha nge in the mac machin hine, e, com compos positio ition, n, die die,, or con continu tinuity ity of operation shall be considered as the start of a new lot. Die casti ca sting ngss in insp spect ected ed by th this is met metho hod d sh shal alll be so ma mark rked ed or handled han dled during during the fini finishi shing ng ope operat ration ionss as not to los losee the their ir identity.
6. Quali Quality ty Assurance Assurance 6.1 Responsibil When en sp speci ecifie fied d in th thee Responsibility ity for Inspe Inspection— ction— Wh contract or purchase order, the producer or supplier is respon-
6.2.2 Each die casting of a rando randomly mly selected sample shall be examined to determ determine ine conformance conformance to the requir requirements ements with respect to general quality, dimensions, and identification
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B94 − 13
marki king ng.. Th Thee pr prod oduc ucer er or su supp pplie lierr may us usee a sy syste stem m of mar statistical quality control for such examinations. 7. Chem Chemical ical Compositi Composition on 7.1 Limits— The The die cast casting ing shall con confor form m to the requirerequirements men ts as to che chemica micall com compos positio ition n pre prescr scribed ibed in Table Table 1. Conformance shall be determined by the producer by analyzing samples taken at the time castings are made. If the producer has determined the chemical composition of the metal during the course of manufacture, he shall not be required to sample and analyze the finished product. 7.1.1 When a detailed chemical chemical analysis is required required with a shipment, it shall be called for in the contract or purchase order. 7.1.2 If the prod producer’ ucer’ss or suppl supplier’s ier’s method of composition composition control is acceptable, sampling for chemical analysis may be waived at the discretion of the purchaser. 7.2 Number of Samples— When When required, samples for determination of chemical composition shall be taken to represent the following: 7.2.1 A sample sample shall be taken from each of two repre representasentative castings selected from each lot defined in Section 6.2.1 6.2.1.. 7.3 Methods Samples les fro from m die cas casting tingss for Methods of Samp Sampling— ling— Samp deter de termi mina natio tion n of ch chemi emical cal co comp mpos ositi ition on sh shall all be tak taken en in accordance with one of the following methods: 7.3.1 Samples for chemical chemical analysis shall shall be taken from the material mate rial by dri drillin lling, g, saw sawing ing,, mill milling ing,, tur turnin ning, g, or clip clippin ping g a representative piece or pieces to obtain a weight of prepared sample not less than 75 g. Sampling shall be in accordance with Practice B953 Practice B953.. 7.3.2 By agreem agreement, ent, an appro appropriate priate spectrographic spectrographic sample may be prepared at time of manufacture. 7.3.3 7.3 .3 The met method hod of sam samplin pling g cast pro produc ducts ts for spectrospectrochemical and other methods of analysis shall be suitable for the form for m of mat materia eriall bei being ng anal analyze yzed d and the typ typee of ana analyt lytical ical method used. 7.4 Method Method of Ana Analysi lysis— s— The dete determi rminat nation ion of che chemica micall comp co mpos osit itio ion n sh shal alll be ma made de in ac acco cord rdan ance ce wi with th su suita itabl blee chemical, spectrochemical (Test Method B954 Method B954), ), or other methods. In case of dispute, the results secured by Test Methods B954 shall B954 shall be the basis of acceptance. 8. Mechanical Properties Properties and Tests Tests 8.1 Unles Unlesss specified in the contract or purchase order or specifically guaranteed by the manufacturer, acceptance of die cast casting ingss und under er the these se spe specific cificatio ations ns sha shall ll not dep depend end on mechanical properties determined by tension or impact tests. Tables X1.1 and X1.2 show X1.2 show typica typicall mechan mechanical ical prop properties erties and charact cha racteri eristic stics. s. Whe When n ten tensio sion n or imp impact act test testss are mad made, e, the tension test specimen shown in Fig. 13 of Methods B557 B557,, and the impact test specimen shown in Fig. 6 of Test Methods E23 Methods E23 shall be used. 8.2 Whe When n spe specifie cified d in the contract contract or pur purcha chase se ord order er,, die castings shall withstand proof tests without failure as defined by ag agre reem emen entt be betw twee een n th thee pu purc rcha hase serr an and d th thee pr prod oduc ucer er or supplier.
9. Permissible Variations Variations in Dimensions 9.1 Permis Permissible sible variations variations in dimensions dimensions shall be within the limits specified on the drawings or in the contract or purchase order. 9.1.1 Any dimensions dimensions for which a tolerance is not specified shall be in accord with ADCI Product Standard Series E1 to E16 “E” E16 “E” Series Product Standards inclusive. Standards inclusive. 9.2 Dim Dimens ension ional al tol tolera erance nce dev deviati iations ons wai waived ved by the pur pur-chaser shall be confirmed in writing to the producer or supplier. 10. Gene General ral Quality Quality 10.1 Internal Soundness— When When specified, the soundness of die castings shall confo conform rm to stand standards ards or requi requirement rementss agreed upon between the producer or supplier and the purchaser. The number num ber and extent of imp imperf erfecti ections ons shall not exc exceed eed tho those se specified by the purchaser. The standards or requirements may consistt of radiographs consis radiographs in accord accordance ance with Referen Reference ce Radiographs E505 graphs E505,, photographs, or sectioned die castings. 10.2 10. 2 Imp Imperf erfecti ections ons inh inhere erent nt in die cas casting tingss sha shall ll not be cause for rejection cause rejection pro provid vided ed it is dem demons onstrat trated ed tha thatt the die castings are in accordance with the requirements and standards agreed upon. 10.3 Workmanship— Die D ie ca cast stin ings gs sh shal alll be of un unif ifor orm m quality, free from injurious discontinuities that will adversely affect their serviceability. 10.4 Finish— When W hen spe specifi cified ed in the con contrac tractt or pur purcha chase se orde or derr th thee asas-cas castt su surf rfac acee fin finis ish h re requ quir ired ed sh shall all co conf nfor orm m to standards agreed upon between the purchaser and the producer or supplier, or as prescribed in ADCI Product Standard E18 “E” Series Product Standards. Standards. 10.5 Pressure Tightness— When When specified in the contract or purcha pur chase se ord order er the pre pressu ssure re tig tightn htness ess of die cas casting tingss sha shall ll conform to standards agreed upon between the purchaser and the pro produc ducer er or sup suppli plier er,, or as pre prescr scribe ibed d in ADCI Pro Produc ductt Standard E17 “E” E17 “E” Series Product Standards. Standards . 11. Source Inspection Inspection 11.1 If the purch 11.1 purchaser aser desires that his repre representativ sentativee inspe inspect ct or witness the inspection and testing of the product prior to shipment, such agreement shall be made by the purchaser and producer or supplier as part of the contract or purchase order. 11.2 Whe 11.2 When n suc such h ins inspec pectio tion n or wit witnes nesss of ins inspec pection tion and testing is agreed upon, the producer or supplier shall afford the purchaser’ purch aser’ss repres representativ entativee all reaso reasonable nable facilities to satisf satisfy y him that the product meets the requirements of this specification. Inspection and tests shall be conducted so there is no unnecessary unnec essary interference interference with the prod producer’ ucer’ss opera operations. tions. 12. Reje Rejectio ction n and Rete Retest st 12.1 12 .1 Wh When en on onee or mo more re sam sampl ples es,, de depe pend ndin ing g on th thee ap ap-proved sampling proved sampling plan plan,, fai faill to meet the req requir uiremen ements ts of this specification, the represented lot is subject to rejection except as otherwise provided in 12.2 12.2.. 12.2 12. 2 Lot Lotss reje rejected cted for fai failur luree to meet the req requir uireme ements nts of this specification may be resubmitted for test provided:
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B94 − 13
12.2.1 1 The producer producer has remov removed ed the nonco nonconfor nforming ming mate12.2. rial or the producer has reworked the rejected lot as necessary to correct the deficiencies. 12.3 Indiv Individual idual castings that show injurious injurious imperf imperfection ectionss during subsequent manufacturing operations may be rejected. The producer or suppl supplier ier shall be responsible responsible only for replac replaceement of the rejected castings to the purchaser. As much of the rejected original material as possible shall be returned to the producer or supplier. 13. Cert Certifica ification tion 13.1 The producer producer or supplier shall, when called for in the contract or purchase order, furnish to the purchaser a certificate of inspection stating that each lot has been sampled, tested, and inspected in accordance with this specification, and has been found to meet the requirements specified. 14. Pro Product duct Marking Marking 14.1 Whe 14.1 When n spe specifie cified d in the contract contract or pur purcha chase se ord order er,, all castings shall be properly marked for identification with the part number, name or brand of the producer, as agreed upon. Government applications shall be marked in accordance with SAE AMS-STD-184.
normal handling and transportation. Each package shall contain only one type of item unless otherwise agreed upon. The type of packaging and gross weight of containers shall, unless otherwise agreed upon, be at the producer’s discretion, provided they are such as to ensure acceptance by common or other carriers for safe transportation at the lowest rate to the delivery point. 15.2 Marking— Each Each shi shippi pping ng con contain tainer er sha shall ll be leg legibl ibly y marked with the purchase order number, gross and net weights, and the supplier’s name or trademark. Marking for shipment shall be in accordance with FED-STD-123 for civil agencies and MIL-STD-129 for Military agencies. 15.3 Preservation— Material Material intended for prolonged storage in unheated locations shall be adequately packed and protected to avo avoid id dete deterio riorati ration on and dam damage age.. Whe When n spe specifie cified d in the contra con tract ct or pu purch rchase ase or order der,, mat materi erial al sha shall ll be pr prese eserv rved, ed, packaged, and packed in accordance with the requirements of Practices B660 B660.. The applicable levels shall be as specified in the contract or order. 16. Keyw Keywords ords 16.1 casting character characteristics; istics; composition composition;; high pressure pressure die
15. Pack Packagin aging, g, Marking, and Storage 15.1 Packaging— Unless Unless otherwise specified, the die castings shall be packaged to provide adequate protection during
cast alloy; magnesium; mechanical prop properties; erties; performance performance characteristics
APPENDIXES (Nonmandatory Information) X1. MECHANICA MECHANICAL L PROPERTIES PROPERTIES AND CHARACTERISTICS
X1.1 Table X1.1 shows X1.1 shows certain casting and other outstanding characteristics which are usually considered in selecting a magnesium magnes ium die casting alloy for a specifi specificc application. A No. No. 1 rating is the highest. X1.2 The use of separately X1.2 separately die-cast die-cast test bar barss was omitted omitted from this specifi specification cation revision because they are considered unreliable. Different machines and dies continue to be necessary for die castings and test bars. Comparison between static breakd bre akdown own or pro proof of test and the mech mechanic anical al pro proper perties ties of separately die-cast test bars revealed that test bars made in a different machine in a different die had no correlation with the die casting, other than a common chemical composition. For this reason, it is considered that the only practical method is to havee mec hav mechan hanical ical pro proper perty ty con contro troll bas based ed on pro proof of tes testing ting of whole die casting castings. s. For information information only only,, typica typicall separ separately ately die-cast diecast spe specime cimen n ten tensile sile pro proper perties ties are pre presen sented ted in Table X1.2.. These properties are of tension specimens of the form X1.2 and dimensions shown in Fig. 13 in Methods B557 Methods B557 and and Fig. 6 of Test Methods E23 Methods E23,, when cast in a die in regular production routine and conforming to the chemical composition specified in Tabl Tablee 1. In th thee te tens nsio ion n te test stin ing g of ma magn gnes esiu ium m al allo loy y specimens, the rate of stressing up to the yield strength shall
not exceed 100 ksi (700 MPa)/min. Exceedingly slow rates of testi tes ting ng ma may y re resu sult lt in cr creep eep an and d he henc ncee ar aree to be av avoi oide ded. d. Beyond the yield strength, the rate of straining shall not exceed 0.25 in./in. · min, measured on the gage length of the specimen. It should be thoroughly understood that the figures in the table represent die-cast test specimens and not specimens cut from commercial commer cial die-ca die-cast st parts. X1.3 Alloy AM60A AM60A has has a specifi specificc gravity of about 1.78. It is suggested for use for those applications requiring a combination of good elongation, elongation, yield strength, and tensile strength. strength. X1.4 Alloy AS41A AS41A has has a specifi specificc gravity of about 1.78. The alloy allo y pos posses sesses ses goo good d roo room m tem temper peratu ature re elon elongat gation ion,, yie yield ld streng str ength, th, and ten tensile sile str streng ength. th. At temp tempera eratur tures es up to abo about ut 350° F (175° C) it has a much increased creep resistance over Alloys AZ91A, AZ91A, AZ91B, and AM60A. Maximum resistance to creep is obtained at the lower aluminum content. X1.5 Alloy Alloyss AZ91A and AZ91B AZ91B have a specifi specificc gravi gravity ty of about 1.81. The copper and nickel contents in AZ91A should be kept low to minimize corrosion. The corrosion resistance of Alloy AZ91B is decreased by the higher copper content and die castings made from this alloy should be used under a known
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B94 − 13 TABLE X1.1 Die Casting and Other Characteristics
Alloy UNS
ASTM
M10500
AM50A
M10600
AM60A
M10410
AS41A
M10412
AS41B
M11910
AZ91A
M11912
AZ91B
M11916
AZ91D
M10602
AM60B
M10502
AJ52A
M10604
AJ62A
M10200
AS21A
M10202
AS21B
Approximate Melting Range, °F (°C)
Resistance to Cold DefectsA
Pressure Tightness
Resistance to Hot CrackingB
MachiningC
ElectroplatingD
Surface TreatmentE
Strength at Elevated Temperatures F
1025–1145 (551–618) 1005–1140 (540–615) 1050–1150 (565–620) 1050–1150 (565–620) 875–1105 (470–595) 875–1105 (470–595) 875–1105 (470–595) 1005–1140 (540–615) 957-1144 (514-618) 957-1135 (514-613) 815-1170 (435-632) 815-1170 (435-632)
3G
1G
2G
1G
2G
1G
3G
3G
1G
2G
1G
2G
1G
3
4G
1G
1G
1G
2G
1G
2
4G
1G
1G
1G
2G
1G
2
2
2
2
1
2
2
4
2
2
2
1
2
2
4
2
2
2
1
2
2
4
3G
1G
2G
1G
2G
1G
3
4G
1G
3G
1G
...
...
1
3G
1G
2G
1G
...
...
1
2
1G
1G
1G
2G
1G
2
2
1G
1G
1G
2G
1G
2
A
The ability of alloy to resist formation of cold defects; For example, cold shuts, cold cracks, non-fill “woody” areas, swirls, etc. Ability Abilit y of alloy to withstand stresses from contraction contraction while cooling through the hot-sh hot-short ort or brittl brittle e temper temperature ature range. C Composite rating based on ease of cutting, chip characteristics, quality of finish and tool life. D Ability of the die casting to take and hold an electroplate applied by present standard methods. E Ability of castings to be cleaned in standard pickle solutions and to be conditioned for best paint adhesion. F Rating based on resistance to creep at elevated temperatures. G Rating based upon limited experience, given guidance only. B
TABLE X1.2 Typical Properties of Magnesium Alloy Die-Cast Test Specimens A Property/UNS Alloy
Tensile strength, ksi (MPa) Tensile yield strength, ksi (MPa) Compression yield strength, ksi (MPa) Elongation in 2 in. (50 mm), percent Impact, ft·lbB (J) Shear strengthC , ksi (MPa) Fatigue strengthD , ksi (MPa) Brinell hardness Rockwell hardness, F scale
M100500AM50A
M10600AM60A M10602AM60B
M10410AS41A M10412AS41B
M11910-AZ91A M11912-AZ91B M11916-AZ91D
M10502AJ52A
M10604AJ62A
M10200AS21A
M1010202AS21B
29 (200) 16 (110) ... ... 10 ... ... ... ... ... ... 58 ...
32 (220) 19 (130) ... ... 8 ... ... ... ... ... ... 62 ...
31 ((2 210) 20 (140) (1 ... ... 6 ... ... ... ... ... ... ... ...
34 (230) 23 (160) 23 (160) 3 2 (3) 20 (140) 14 (100) 63 75
32 (221) 20 (141) 13 (90) 7 5 (7.4) ... ... 9 (60) 60 ...
34 (232) 20 (141) 15 (105) 7 10 (13.3) ... ... 12 (80) 61 ...
33 (230) 17 (120) 15 (106) 12 3.7 (5) ... ... ... ... 55 ...
34 (231) 18 (122) 15 (106) 13 3.7 (5) ... ... ... ... 55 ...
A
ksi = 1000 psi. For explanation of SI unit MPa see Appendix X2. X2. Unnotched. C Double-shear tests converted to single-shear values. D 5 × 108 cycles. B
range ge of atmo atmosph spheric eric condition conditionss for which the their ir life can be ran considered satisfactory. X1.6 Alloys AS41B, AS41B, AM60B, AM60B, and AZ91D AZ91D are high purity versions versio ns of AS41A AS41A,, AM60 AM60A, A, and AZ91B. As a result result they have improved resistance to salt-water (aqueous NaCl) corrosion.
X1.7 All X1.7 Alloy oy AM50A AM50A is a hig high h pur purity ity allo alloy y with corrosio corrosion n resistance similar to AM60B, but with improved ductility due to the reduced level of aluminum content. X1.8 X1. 8 All Alloys oys AJ5 AJ52A 2A and AJ6 AJ62A 2A are allo alloy y com compos positio itions ns based on aluminum and strontium additions for improved creep
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B94 − 13
resista istance nce and ten tensile sile pro proper perties ties at elev elevate ated d temp temperat erature uress res relativee to AS alloys. the corro relativ corrosion sion resistance resistance of these alloys is compet com petitiv itivee wit with h the hig high h pur purity ity allo alloys ys abo above. ve. The AJ62A AJ62A composition compo sition has improv improved ed castabi castability lity with slightly reduce reduced d creep resistance relative to AJ52A.
X1.9 Alloys AS21A AS21A and AS21B have improved creep resistance and tensile properties relative to the AS41A and AS41B alloys. Both alloys possess good castability and ductility. The AS21 AS 21B B al allo loy y is a mo modi difie fied d co comp mpos ositi ition on wi with th sa salt lt wa wate terr corrosion resistance equivalent to the high purity alloys.
X2. METRIC EQUIVALENTS EQUIVALENTS 2
X2.1 The SI unit for strength strength properties properties (MPa) is in accor accor-dance with the International System of Units (SI). The derived SI unit for force is the newton (N), which is defined as that force which when applied to a body having a mass of one kilogra kilo gram m giv gives es it an acc acceler eleratio ation n of one metre per second second squared squar ed (N = kg·m/s2). Th Thee de deri rive ved d SI un unit it fo forr pr pres essu sure re or
stress is the newton per square metre (N/m ), which has been named the pascal (Pa) by the General Conference on Weights and Measures. Since 1 ksi = 6 894 757 Pa the metric equivalents are expressed as megapascal (MPa), which is same as MN/m2 and N/mm2.
SUMMARY OF CHANGES
Committee B07 has identified the locations of selected changes to this standard that have been incorporated since the last issue (B94 – 07. (Approved May 1, 2013). (1) Replaced withdrawn Test Methods E35 with Practice B953 Practice B953 and Test Method B954 Method B954..
(2) Replaced cancelled FED-STD-184 with superceding SAE AMS-STD-184.
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