1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED SEPTEMBER 1980 BS 2L 128:1970 (Superseding BS L 128) Specification for Ingots and castings of magnesium-zinc- cerium-zirconium alloy (Precipitation treated) (Zn 4.5, rare earth metals 1.2, Zr 0.7) UDC 629.7:669.721.55855296-4-14BS2L128:1970 This British St
2、andard, having been approved by the Aerospace Industry Standards Committee, was published under the authorityof the Executive Boardof the Institution on 26March1970 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/27 Draft for comment 69/20612 ISB
3、N 0 580 05968 5 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This doc
4、ument comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publica
5、tion Amd. No. Date CommentsBS2L128:1970 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Chemical composition 1 3 Heat treatment 1 4 Mechanical properties 2 5 Protection against corrosion 2ii blankBS2L128:1970 BSI 01-2000 1 1 Inspection and testing procedure The ingots and castings
6、 shall be inspected and tested in accordance with the relevant requirements of BSL101 as follows: 2 Chemical composition 2.1 Ingots. The chemical composition of the ingots shall be: 2.2 Castings. The chemical composition of the castings shall be: 3 Heat treatment 3.1 The castings and test samples sh
7、all be heat-treated together as follows: 1) Heat at a temperature not exceeding375 C for not less than2 hours. 2) Cool in air or quench in oil or water, at the option of the manufacturer. Ingots Sections 1 and 2 Castings not subject to cut-up testing Sections 1 and 3 Castings subject to cut-up testi
8、ng Sections 1 and 4 Element Per cent min. max. Rare earth metals 1.0 1.7 Zinc 3.5 5.0 Zirconium 0.1 1.0 Manganese 0.15 Copper 0.03 Silicon 0.01 Iron 0.01 Nickel 0.005 Magnesium The remainder Element Per cent min. max. Rare earth metals 0.8 1.7 Zinc 3.5 5.0 Zirconium 0.4 1.0 Manganese 0.15 Copper 0.0
9、3 Silicon 0.01 Iron 0.01 Nickel 0.005 Magnesium The remainderBS2L128:1970 2 BSI 01-2000 4 Mechanical properties NOTEThe tensile test values specified for test pieces machined from separately cast test samples may not be realized in certain portions of castings. The mechanical properties obtained fro
10、m separately cast test samples, selected and prepared in accordance with the relevant requirements of BS L101, shall be not less than the following values: 5 Protection against corrosion The material shall be protected before despatch by one of the methods given in Ministry of Technology aircraft pr
11、ocess specification D.T.D. 911. The method to be used shall be selected by the purchaser in accordance with the recommendations of DGQA Technical Memorandum M.6 and shall be stated on the order. Test sample 0.2% proof stress Tensile strength Elongation MN/m 2 MN/m 2 % Sand cast 135 200 3 Chill cast
12、135 215 4 NOTE1 MN/m 2= 0.102kgf/mm 2=0.1hbar = 0.065tonf/in 2 . Information on SI units is given in BS350, “Conversion factors and tables”, and PD5686, “The use of SI units”.blankBS 2L 128:1970 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national b
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