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1、BRITISH STANDARD AEROSPACE SERIES BS L 160: 1976 Incorporating Amendment No. 1 Specification for Bars and extruded sections of aluminium- zinc-magnesium- copper-chromium alloy (Solution treated and artificially aged to an overaged condition) (Zn 5.6, Mg 2.5, Cu 1.6, Cr 0.22) UDC 629.7:669.7155721326
2、 42 BS L 160:1976 This British Standard, having been prepared under the direction of the Aerospace Industry Standards Committee, was published under the authority of the Executive Board on 28 May 1976 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference A
3、CE/24 Draft for comment 72/36415 DC ISBN 0 580 08979 7 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
4、 obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 3 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
5、cover. Amendments issued since publication Amd. No.Date of issueComments 5583July 1987Indicated by a sideline in the margin BS L 160:1976 BSI 02-2000i Contents Page 1Inspection and testing procedure1 2Quality of material1 3Chemical composition1 4Condition1 5Heat treatment1 6Mechanical properties1 7R
6、esistance to stress corrosion cracking2 Appendix A Test for resistance to stress corrosion cracking3 Figure 1 Test pieces for stress corrosion test3 ii blank BS L 160:1976 BSI 02-20001 NOTEOther forms of material of similar composition and in the same heat treatment condition are covered by the foll
7、owing British Standards: BS L 161, Hand and die forgings. BS L 162, Cold compressed hand forgings. The latest issues of these standards should be used. 1 Inspection and testing procedure This British Standard shall be used in conjunction with the relevant sections of the latest issue of BS L 100 as
8、follows: 2 Quality of material The material shall be made from aluminium and alloying constituents, with or without approved scrap at the discretion of the manufacturer. 3 Chemical composition The chemical composition of the material shall be: 4 Condition Unless otherwise agreed and stated on the or
9、der, the material shall be supplied solution treated, controlled stretched and subsequently artificially aged to an overaged condition. NOTEThis condition is equivalent to the AECMA temper designation T.7351. 5 Heat treatment The material shall be heat treated as follows: a) solution treat by heatin
10、g at a temperature of 465 5 C and quenching in water at a temperature not exceeding 40 C; b) artificially age by heating at a temperature of 110 5 C for 6 h to 24 h, followed, with or without cooling, by further heating at a temperature of 177 5 C for 5 h to 12 h, followed by air cooling. 6 Mechanic
11、al properties 6.1 Tensile test. The mechanical properties obtained, in the longitudinal direction, from test pieces selected and prepared in accordance with the relevant requirements of BS L 100 shall be not less than the following values: Bars for machining and extruded sections sections 1 and 5 Ba
12、rs for machining and extruded sections for highly stressed structures sections 1 and 6 Element % min.max. Silicon0.40 Iron0.50 Copper1.22.0 Manganese0.30 Magnesium2.12.9 Chromium0.180.28 Zinc5.16.1 Titanium0.20 Titanium plus zirconiuma0.25 Others:a each0.05 total0.15 AluminiumRemainder a Subject to
13、the discretion of the Quality Assurance Authority, determination of these elements need be made on a small proportion only of the samples analysed. Sectional thickness 0.2 % proof stress Tensile strength Elongation on gauge length of 50 mm5.65So mm MPa (= N/mm2) MPa (= N/mm2) % OverUp to and includi
14、ng 1040047078 10204204858 20504154858 50754104758 751003804507 1001503654257 NOTEInformation on SI units is given in BS 3763 “The International System of units (SI)” and BS 350 “Conversion factors and tables”. BS L 160:1976 2 BSI 02-2000 7 Resistance to stress corrosion cracking 7.1 Electrical condu
15、ctivity 7.1.1 The electrical conductivity of the tensile test piece and of each piece of material in each batch shall be determined by a method approved by the Quality Assurance Authority. The material shall be acceptable only if a) the conductivity is not less than 23 MS/m, or b) the conductivity i
16、s less than 23 MS/m but not less than 22 MS/m and the 0.2 % proof stress is not more than 85 MPa greater than the appropriate minimum specified in 6.1. 7.1.2 If the conductivity is less than 23 MS/m and not less than 22 MS/m but the proof stress requirement of 7.1.1 b) is not met, the material shall
17、 be retested in accordance with one of the following procedures. a) The batch shall be re-heat treated in accordance with clause 5 and retested, and the material shall comply with the requirements of 6.1 and 7.1.1. b) The batch shall be given such a period of additional artificial ageing at the high
18、er temperature that, when retested, the material shall comply with the requirements of 6.1 and 7.1.1. c) A sample taken from the batch shall be re-solution treated, by heating at a temperature of 465 5 C for not less than 30 min and quenching in cold water, and the conductivity shall be determined w
19、ithin 15 min. The conductivity of this sample shall be at least 3.5 MS/m below that of the original fully heat treated sample. 7.2 Stress corrosion test. Material in the fully heat treated condition shall be capable of being subjected to the test described in Appendix A without failure. This shall b
20、e demonstrated by testing at a frequency to be determined by the Quality Assurance Authority. BS L 160:1976 BSI 02-20003 Appendix A Test for resistance to stress corrosion cracking A.1 Test piece Cut a test piece, in the transverse direction where the section size permits, from a test sample selecte
21、d in accordance with the requirements of BS L 100, section 5 or section 6 as appropriate, and machined, subsequent to heat treatment, to the dimensions shown in Figure 1(a) or Figure 1(b). A.2 Preparation of test piece Prepare the test piece, prior to loading, as follows: a) degrease by washing in a
22、cetone; b) rinse in distilled water and dry. A.3 Test solution Use a solution of 3.5 0.5 % sodium chloride (AR grade) in distilled or deionized water having a pH value within the range 6.4 to 7.2 and maintained at a temperature of 24 1 C. Check the solution each working day to determine the amount o
23、f water lost due to evaporation and add distilled or deionized water as necessary to bring the salt concentration to 3.5 0.5 %. Prepare a fresh solution weekly. Maintain the pH value within the required range by adding dilute hydrochloric acid or dilute sodium hydroxide as necessary. A.4 Procedure A
24、.4.1 Load the test piece to 75 % of the appropriate minimum 0.2 % proof stress specified in 6.1 and hold at a constant strain in a suitable fixture. A.4.2 Immerse the loaded test piece in the test solution for 10 1 min. A.4.3 Remove from the test solution and suspend in air for 50 1 min. A.4.4 Repea
25、t the cycle in A.4.2 and A.4.3 for 30 days. NOTEEnds symmetrical. (a) Tensile test piece Dt 20 25 30 1.5 2.0 2.5 (b) C-ring test piece All dimensions are in millimetres. Figure 1 Test pieces for stress corrosion test BS L 160: 1976 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Insti
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