(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) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 利用硬度檢測(cè)和透射電鏡觀察研究含θ″析出相的Al-Cu合金在不同加工溫度下多向壓縮(MAC)變形后的組織。結(jié)果表明：溫度大于60 ℃的加工能顯著提高合金的加工性能；經(jīng)60 ℃和70 ℃加工獲得的亞晶組織穩(wěn)定；而經(jīng)100 ℃加工過程形成的細(xì)小亞晶出現(xiàn)合并長(zhǎng)大現(xiàn)象。MAC加工15道次獲得的組織分布極其不均勻，這種不均勻性與MAC變形方式密切相關(guān)；當(dāng)加工道次提高到35次時(shí)，細(xì)晶組織基本分布均勻。對(duì)比分析表明試樣經(jīng)60 ℃MAC加工35道次后的組織狀態(tài)最為理想。
關(guān)鍵字: Al-Cu合金；多向壓縮變形；亞晶；剪切帶
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:Al-Cu alloy containing θ″ precipitated phase was processed by multi-axial compression (MAC) deformation at various temperatures. The organization evolution was investigated by transmission electron microscopy and vickers hardness tester. The results show that the processing properties of the alloy can be significantly improved with processing temperature rising to 60 ℃. The subgrains obtained during processing at 60 and 70 ℃ are stable, and grow up as the temperature rising to 100 ℃. The uneven distribution of the microstructures of Al-Cu alloy processed by MAC with 15 passes is associated with the deformation pattern of MAC. This can be resolved through the increase of steps to 35 passes. Comparing microstructures of the different processing states, which shows that the microstructures processed during 60 ℃ with 35 passes is optimal.
Key words: Al-Cu alloy; multi-axial compression deformation; subgrain; shear band
