(1. 太原科技大學(xué) 材料科學(xué)與工程學(xué)院，太原 030024；
2. 太原科技大學(xué) 應(yīng)用科學(xué)學(xué)院，太原 030024)
摘 要: 采用熱力模擬實(shí)驗(yàn)和電子背散射衍射(EBSD)等測(cè)試方法，研究溫度為350、420 ℃和應(yīng)變速率為0.1 s-1條件下新型Al-Zn-Mg-Cu 超高強(qiáng)鋁合金軸對(duì)稱熱壓縮變形以及400 ℃、1 h 退火微觀組織和織構(gòu)的演變。結(jié)果表明：在350 ℃條件下進(jìn)行80%的壓縮變形過(guò)程中微觀組織的演變機(jī)理是動(dòng)態(tài)回復(fù)和大應(yīng)變幾何動(dòng)態(tài)再結(jié)晶；主要織構(gòu)是沿著α 取向線分布的黃銅織構(gòu){110}<112>和少量的Goss{110}<001>織構(gòu)；退火過(guò)程中發(fā)生靜態(tài)回復(fù)和程度較小的靜態(tài)再結(jié)晶，出現(xiàn)旋轉(zhuǎn)立方織構(gòu){100}<011>，黃銅織構(gòu)Brass {110}<112>沿著α 取向線向Goss 織構(gòu){110}<001>轉(zhuǎn)變；420 ℃進(jìn)行80%壓縮變形的微觀晶粒組織較均勻，細(xì)小的再結(jié)晶晶粒分布在變形劇烈的晶界或三角晶界處，織構(gòu)類型為旋轉(zhuǎn)立方織構(gòu){100}<011>；退火過(guò)程中發(fā)生亞動(dòng)態(tài)再結(jié)晶和晶粒長(zhǎng)大，該過(guò)程中旋轉(zhuǎn)立方織構(gòu){100}<011>減弱，并出現(xiàn)黃銅織構(gòu){110}<112>。
關(guān)鍵字: Al-Zn-Mg-Cu 超高強(qiáng)鋁合金；軸對(duì)稱熱壓縮；動(dòng)態(tài)回復(fù)；動(dòng)態(tài)再結(jié)晶；微觀組織；織構(gòu)
（1.School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;
2. School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China）
Abstract:The microstructure and texture evolution of new Al-Zn-Mg-Cu ultra-strength aluminum alloy during axisymmetric hot compression at temperatures of 350,420 ℃ and strain rate 0.1 s-1 and annealing at 400 ℃ for 1 h processes were studied by thermo-mechanical modeling experiments and EBSD testing method. The results show that the microstructure evolution mechanism during hot compression up to 80% reduction at 350 ℃ is dynamic recovery and large strain geometric dynamic recrystallization. Brass {110}<112> along the α-fiber and a little Goss {110}<001> dominate mainly during the deformation process. During the annealing process,static recovery and static recrystallization with small recrystallized fraction occur. Rotated cube {100}<011> appears and Brass {110}<112> transforms to Goss {110}<001> along α-fiber. When the reduction is up to 80% at 420 ℃,the refined homogeneous recrystallized grains locate at severe deformed grain boundaries or the triangle grain boundaries. Rotated cube {100}<011> appears during the deformation process. During the annealing process,meta dynamic recrystallization and grain growth dominate. Rotated cube {100}<011> decreases and Brass {110}<112> appears.
Key words: Al-Zn-Mg-Cu ultra-strength aluminum alloy; axisymmetric hot compression; dynamic recovery; dynamic recrystallization; microstructure; texture
