(中南大学 粉末冶金国家重点实验室, 长沙 410083)
摘 要: 通过金相显微分析和TEM分析及力学性能测试， 研究了固溶后降温过程中高温预析出处理对7055铝合金显微组织和力学性能的影响。 结果表明： 高温预析出可在晶界形成不连续的析出相； 465℃预析出在保证合金强度的同时， 抗应力腐蚀性能得到提高， 并且随着固溶后预析出时间的延长, 晶界上析出相更加粗大离散。
关键字: 7055铝合金； 固溶； 预析出； 应力腐蚀
microstructure and mechanical
property of 7055 alloy
（State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083 , China）
Abstract:The effect of high temperature pre-precipitation following solution treatment on grain boundary precipitation and mechanical/corrosion properties of 7055 alloy was investigated. The pre-precipitation at 465℃ results in discrete precipitation on the grain boundary, which enhances the stress corrosion resistance of alloy with the same mechanical property. With prolonged pre-precipitation following solution, the mechanical properties of 7055 alloy remains unchanged with more coarse precipitate on the grain boundary.
Key words: 7055 alloys; solution; pre-precipitation; stress corrosion
