(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室, 長(zhǎng)沙 410083)
摘 要: 通過(guò)金相顯微分析和TEM分析及力學(xué)性能測(cè)試， 研究了固溶后降溫過(guò)程中高溫預(yù)析出處理對(duì)7055鋁合金顯微組織和力學(xué)性能的影響。 結(jié)果表明： 高溫預(yù)析出可在晶界形成不連續(xù)的析出相； 465℃預(yù)析出在保證合金強(qiáng)度的同時(shí)， 抗應(yīng)力腐蝕性能得到提高， 并且隨著固溶后預(yù)析出時(shí)間的延長(zhǎng), 晶界上析出相更加粗大離散。
關(guān)鍵字: 7055鋁合金； 固溶； 預(yù)析出； 應(yīng)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
