(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；
2. 中南大學(xué) 有色金屬先進(jìn)結(jié)構(gòu)材料與制造協(xié)同創(chuàng)新中心，長(zhǎng)沙 410083；
3. 煙臺(tái)南山學(xué)院 工學(xué)院，煙臺(tái) 265713)
摘 要: 采用正交試驗(yàn)及其方差分析、最小顯著差數(shù)(LSD)法研究新型Al-Cu-Li-Ag-Mg-Zr-Ce合金的固溶和時(shí)效熱處理工藝，并采用電導(dǎo)率、SEM、EDX、TEM等測(cè)試手段對(duì)合金熱處理過程中組織結(jié)構(gòu)和性能進(jìn)行分析。結(jié)果表明：該合金在固溶(520 ℃，1.5 h，水冷)和時(shí)效(180 ℃，18 h，空冷)處理后，T6態(tài)顯微硬度比軋制態(tài)的提高100.8%，T87態(tài)強(qiáng)度值達(dá)到623 MPa。固溶過程中，大量Ce、Cu、Mg、Zr溶于基體起到固溶強(qiáng)化作用；時(shí)效時(shí)細(xì)小片狀強(qiáng)化相T1和薄盤狀θ′相均勻彌散在基體中析出，具有強(qiáng)烈沉淀強(qiáng)化效果。
關(guān)鍵字: Al-Cu-Li合金；熱處理；正交實(shí)驗(yàn)；力學(xué)性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation
Center Central South University, Changsha 410083, China;
3. School of Engineering, Yantai Nanshan University, Yantai 265713, China）
Abstract:Solid solution and aging treatment of novel Al-Cu-Li-Ag-Mg-Zr-Ce alloy was investigated by orthogonal experiment variance analysis and least significant difference (LSD) methods. Meanwhile, the microstructure characteristics and mechanical properties were explored by electrical conductivity (EC) test, scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDX) and transition electron microscopy (TEM). The results show that the micro-hardness of alloy under T6 condition are improved by 100.8% compared to that of rolling one, and the strength for alloy under T87 condition also reaches to 623 MPa after solid solution (520 ℃, 1.5 h, water quenched) and aging treatment (180 ℃, 18 h, air quenched). During solid solution, a lager amount of Ce、Cu、Mg and Zr atoms dissolve into the matrix, resulting in a strong solid solution strengthening. During the aging treatment, many fine needle-shaped T1 phase and plate-shaped θ′ phase precipitate in the matrix uniformly and dispersively, leading to an enormous precipitation strengthening.
Key words: Al-Cu-Li alloy; heat treatment; orthogonal experiment; mechanical property
