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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 ,而且能保持较高的强度
The strength and stress corrosion cracking (SCC) behavior of 70 75 aluminum alloy after aging and regressive treatment under different regimes were studied by Vickers hardness tester and slow strain rate tensile test (SSRT). The results show that the strength, hardness and SCC sensitivity of 70 75 aluminum alloy are closely related to aging temperature and time. For single-stage aging, the peak-aged 70 75 T6 aluminum alloy has the highest strength but also has the highest SCC sensitivity. Oven T735 1 and A180 can significantly improve the SCC resistance of alloys, but the tensile strength at break of SSRT decreases by about 20%. Multi-stage aging, regression re-aging (RRA) can not only reduce the stress corrosion susceptibility of 70 75 aluminum alloy, but also maintain high strength