高温预析出对Al-Zn-Mg-Cu铝合金显微组织和力学性能的影响  

Effect of high temperature pre-precipitation on microstructure and mechanical property of Al-Zn-Mg-Cu aluminum alloys

作　　者：张茁[1] 陈康华[1] 刘红卫[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《粉末冶金材料科学与工程》2003年第4期351-357,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划项目(G1999064900);教育部高等学校骨干教师资助计划资助(教育司[2000]65)

摘　　要：通过光学显微镜和IEM观察和力学性能测试,分析了固溶后高温预析出处理对Al-Zn-Mg-Cu铝合金显微组织及力学性能的影响。结果表明:高温预析出可在晶界形成不连续的析出相,465℃预析出在保证合金硬度的同时,使抗应力腐蚀性能提高,随着预析出温度的降低合金的电导率和抗应力腐蚀开裂性能均得到提高。The effect of high temperature pre-precipitation after solution treatment on the state of precipitation at the grain boundary was investigated by optical microscope and TEM. The results show that pre-precipitation at 465 ℃ can form the discrete precipitation at the grain boundary which can enhance the stress corrosion resistance of alloys, at the same time can maintain high mechanical property of the alloys. With the decrease of pre-precipitation temperature, both the stress corrosion cracking resistance and electrical conductivity can be enhanced.

关 键 词：7055铝合金 预析出 应力腐蚀 固溶 

分 类 号：TG249.9[金属学及工艺—铸造]