1、BRITISH STANDARD AEROSPACE SERIES BS 2L 126: 1970 (Superseding BSL126) Specification for Ingots and castings of magnesium-cerium- zinc-zirconium alloy (Precipitation treated) (Rare earth metals 3.0, Zn 2.3, Zr 0.6) UDC 629.7:669.721.58555296-4-14BS2L126:1970 This British Standard, having been approv
2、ed by the AerospaceIndustry Standards Committee, was published underthe authority of the Executive Board of the Institutionon 26March1970 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/27 Draft for comment 69/20612 ISBN 0 580 05948 0 A British S
3、tandard 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 document comprises a front cov
4、er, an inside front cover, pages i and ii, page 1 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 publication Amd. No. Date CommentsBS2L126
5、:1970 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Chemical composition 1 3 Heat treatment 1 4 Mechanical properties 1 5 Protection against corrosion 1ii blankBS2L126:1970 BSI 01-2000 1 1 Inspection and testing procedure The ingots and castings shall be inspected and tested in
6、accordance with the relevant requirements of BS L101as 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 shall be heat-treated together as fo
7、llows: 1) Heat at a temperature not less than170 C nor more than200 C for not less than10hours, or when the order so stipulates, heat at a temperature not less than200 C nor more than250 C for not less than6hours nor more than24hours. 2) Cool in air or quench in oil or water, at the option of the ma
8、nufacturer. 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 from separately cast test samples, selected and prepared in accordance with the
9、 relevant requirements of BSL101, 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 process specification D.T.D. 911. The method to be used shall be selected by th
10、e purchaser in accordance with the recommendation of DGQA Technical Memorandum M.6 and shall be stated on the order. Ingots Sections 1 and 2 Castings not subject to cut-up testing Sections 1 and 3 Castings subject to cut-up testing Sections 1 and 4 Element Per cent min. max. Rare earth metals 2.5 4.
11、0 Zinc 0.8 3.0 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 2.5 4.0 Zinc 0.8 3.0 Zirconium 0.4 1.0 Manganese 0.15 Copper 0.03 Silicon 0.01 Iron 0.01 Nickel 0.005 Magnesium The remainder Test samp
12、le 0.2% proof stress Tensile strength Elongation MN/m 2 MN/m 2 % Sand cast 95 140 3 Chill cast 100 155 3 NOTE1 MN/m 2= 0.102 kgf/mm 2= 0.1 hbar = 0.065 tonf/in 2 . Information on SI units is given in BS 350, “Conversion factors and tables”, and PD 5686, “The use of SI units”.BS 2L 126: 1970 BSI 389
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