高温预析出对7A52合金应力腐蚀性能的影响  

Effect of high-temperature pre-precipitation on stress corrosion cracking of 7A52 alloy

作　　者：陈康华[1] 黄兰萍[1] 郑强[1] 胡化文[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2005年第3期441-445,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50471057);国家武器装备预先研究资助项目(41312020205)

摘　　要：通过对7A52合金时效状态的强度、硬度、电阻率和应力腐蚀性能的测试, 对比分析了高温预析出对7A52合金T4和T61时效状态应力腐蚀和强度性能的影响。结果表明: 高温预析出可以提高 7A52 T4 和 7A52 T61合金的抗应力腐蚀性能, 同时其强度和延伸率有所增加; 高温预析出处理的 7A52 T61 合金拉伸强度达 500MPa, 延伸率13.0%, KISCC达到10.2 MPa·m1/2。The influence of high-temperature pre-precipitation treatment on tensile property, hardness, electrical resistivities and stress corrosion cracking (SCC) of 7A52-T4 and 7A52-T61 alloys were systematically investigated. The results show that high-temperature pre-precipitation treatment can obviously enhance the resistance to stress corrosion cracking and mildly increase the strength and elongation of 7A52-T61 and 7A52-T4 alloys. After high-temperature pre-precipitation treatment, the tensile strength, elongation and K_(ISCC) of the 7A52-T61 alloys with high-temperature pre-precipitation treatment are 500MPa, 13.0% and 10.2MPa·m^(1/2), respectively.

关 键 词：Al-Zn—Mg系 铝合金 应力腐蚀 预析出 时效 

分 类 号：TG249.9[金属学及工艺—铸造]