本文選題：Al-Zn-Mg-Zr合金　切入點(diǎn)：雙級(jí)時(shí)效　出處：《中南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2015年11期

【摘要】：通過慢應(yīng)變速率拉伸實(shí)驗(yàn)(SSR_T)、晶間腐蝕試驗(yàn)、剝落腐蝕實(shí)驗(yàn)、室溫力學(xué)性能測(cè)試、電導(dǎo)率測(cè)試、維氏硬度測(cè)量和透射電子顯微分析等手段對(duì)2.5 mm厚Al-5.4Zn-2.0Mg-0.25Sc-0.1Zr合金板材在雙級(jí)時(shí)效下的抗應(yīng)力腐蝕性能(SCC)、抗晶間腐蝕性能(IGC)、抗剝落腐蝕性能(EC)、力學(xué)性能、電學(xué)性能、顯微組織結(jié)構(gòu)及其演變規(guī)律進(jìn)行研究。研究結(jié)果表明:合金較適宜的雙級(jí)時(shí)效工藝為120℃/6 h+140℃/20 h,在此工藝條件下合金的抗拉強(qiáng)度R_m、屈服強(qiáng)度R_p、伸長率A和電導(dǎo)率γ分別為553 MPa,534 MPa,12.0%和22.3 MS/m,雙級(jí)時(shí)效后合金晶內(nèi)為彌散分布的亞穩(wěn)定強(qiáng)化相η′-MgZn_2,晶界出現(xiàn)粗大不連續(xù)分布的平衡相η-MgZn_2,還伴有明顯寬化的無沉淀析出帶。與單級(jí)峰值時(shí)效(120℃/24 h)相比,合金晶間腐蝕傾向減小,具有良好的抗剝落腐蝕性能,剝蝕等級(jí)為中等剝落腐蝕(EB)級(jí),具有良好的抗應(yīng)力腐蝕性能。
[Abstract]:Through the slow strain rate tensile test (SSRS), the intergranular corrosion test, the exfoliation corrosion test, the mechanical property test at room temperature, the electrical conductivity test, Vickers hardness measurement and transmission electron microscopy (TEM) were used to study the stress corrosion resistance (SCC), intergranular corrosion resistance (IGC), exfoliation corrosion resistance (ECC), mechanical properties and electrical properties of 2.5mm thick Al-5.4Zn-2.0Mg-0.25Sc-0.1Zr alloy plates under two-stage aging. The microstructure and evolution of the alloy were studied. The results showed that the suitable two-stage aging process was 120 鈩，

本文編號(hào)：1668671