用维氏硬度计和慢应变速率拉(SSRT)技术研究了7075铝合金以不同制度时效和回归处理后的强度和应力腐蚀断裂(SCC)行为.结果表明:7075铝合金的强度,硬度和SCC敏感性与时效温度和时间密切相关.对于单级时效,峰时效7075-T6铝合金的强度最大,但其SCC敏感性也最大.过时效T7351及A180能显著提高合金的耐SCC性,SSRT拉伸断裂强度却下降约20%.多级时效,回归再时效(RRA)不仅能降低7075铝合金的应力腐蚀敏感性,而且能保持较高的强度.
参考文献
| [1] | Uguz A;Martin J W .The effect of retrogression and reageing on the ductile fracture toughness of Al-Zn-Mg alloys containing different dispersoid phases[J].Journal of Materials Science,1995,30:5923-5926. |
| [2] | Tsai T C;Chang J C;Chuang T H .Stress corrosion cracking of superplastically formed 7475 aluminum alloy[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1996,28(10):2113-2121. |
| [3] | Fleck P;Calleros D;Madsen M.Retrogression and reaging of 7075 T6 aluminum alloy[A].Swizerland:2000 Trans Tech Publications,2000:649-654. |
| [4] | Cina B .[P].US Patent 3856584,1974. |
| [5] | TaliankerM;Cina B .Retrogression and reageing and the role of dislocations in the stress corrosion of 7000-type aluminum alloy[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1989,20:2087-2092. |
| [6] | Shantanu Maitra .Determination of stress corrosion cracking resistance of Al-Cu-Mg alloys by slow strain rate and alternate immersion testing[J].Corrosion,1981,37(02):98-103. |
| [7] | Braun R .Slow strain rate testing of aluminum alloy 7050 in different tempers using various synthetic environments[J].Corrosion,1997,53(06):467-474. |
| [8] | Altenpohl D.Aluminum Viewed from Within[M].Dusseldorf: Aluminium-Verlag GmbH,1982:79-91. |
| [9] | Tsai T C;Chuang T H .Role of grain size on the stress corrosion cracking of 7475 aluminum alloys[J].Materials Science and Engineering,1997,A225(02):135-144. |
| [10] | 刘继华,李获,郭宝兰,张佩芬.LC4高强铝合金的慢应变速率拉伸试验[J].材料科学与工艺,2001(01):37-41. |
| [11] | Tanguy D;Bayle B;Dif R.Hydrogen effects during SCC propagation of Al-5Mg in 30g/l NaCl solution[A].Swizerland:2000 Trans Tech Publications,2000:1479-1488. |
| [12] | Albrecht J;Thompson A W;Beenstein I M .The role of microstructure in hydrogen-assisted fracture of 7075 aluminum[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1979,10(11):1759-1766. |
| [13] | J.Liu;M.Kulak .A new paradigm in the design of aluminum alloys for aerospace applications[J].Materials Science Forum,2000(1):127-140. |
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