(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)對(duì)7A52合金時(shí)效狀態(tài)的強(qiáng)度、 硬度、 電阻率和應(yīng)力腐蝕性能的測(cè)試， 對(duì)比分析了高溫預(yù)析出對(duì)7A52合金T4和T61時(shí)效狀態(tài)應(yīng)力腐蝕和強(qiáng)度性能的影響。 結(jié)果表明： 高溫預(yù)析出可以提高7A52-T4和7A52-T61合金的抗應(yīng)力腐蝕性能， 同時(shí)其強(qiáng)度和延伸率有所增加； 高溫預(yù)析出處理的7A52-T61合金拉伸強(qiáng)度達(dá)500 MPa， 延伸率13.0%， KISCC達(dá)到10.2MPa·m1/2。
關(guān)鍵字: Al-Zn-Mg系； 鋁合金； 應(yīng)力腐蝕； 預(yù)析出； 時(shí)效
（ State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract: 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 KISCC of the 7A52-T61 alloys with high-temperature pre-precipitation treatment are 500 MPa, 13.0% and 10.2 MPa·m1/2, respectively.
Key words: Al-Zn-Mg series; aluminum alloy; stress corrosion; pre-precipitation; ageing
