摘要
用维氏硬度计和慢应变速率拉伸 (SSRT)技术研究了 70 75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 :70 75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 70 75 T6铝合金的强度最大 ,但其SCC敏感性也最大。过时效T735 1及A180能显著提高合金的耐SCC性 ,SSRT拉伸断裂强度却下降约 2 0 %。多级时效 ,回归再时效 (RRA)不仅能降低 70 75铝合金的应力腐蚀敏感性 。
The stress corrosion cracking (SCC) behavior and the strength properties of 7075 aluminum alloy with various tempers have been studied using slow strain rate tension (SSRT) technique and a Vickers meter. The experimental results show that the hardness, the strength and the SCC susceptibility of 7075 aluminum alloy are greatly concerned with the ageing time and the ageing temperature. At a strain rate of 9.68×10 -7 s -1 , the strength of 7075 T6 aluminum alloy is maximal among one step ageing, but most susceptible to SCC. The over ageing such as T7351 and A180 can improve the SCC resistance and strength cracking SSRT, but cause a strength loss of approximate 20% during SSRT. The results also indicate that retrogression and re ageing (RRA) may increase the SCC resistance of the 7075 aluminum alloy without sacrificing its strength.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2002年第1期50-53,共4页
Transactions of Materials and Heat Treatment
基金
国家重点基础研究发展规划项目 (G1 9990 6490 9 3)
