(中南大學 粉末冶金國家重點實驗室, 長沙 410083)
摘 要: 通過金相顯微分析和TEM分析及力學性能測試， 研究了固溶后降溫過程中高溫預析出處理對7055鋁合金顯微組織和力學性能的影響。 結果表明： 高溫預析出可在晶界形成不連續(xù)的析出相； 465℃預析出在保證合金強度的同時， 抗應力腐蝕性能得到提高， 并且隨著固溶后預析出時間的延長, 晶界上析出相更加粗大離散。
關鍵字: 7055鋁合金； 固溶； 預析出； 應力腐蝕
microstructure and mechanical
property of 7055 alloy
LIU Hong-wei, LI Song
（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
