一种Al-Zn-Mg-Cu铝合金的热压缩变形行为及微观组织演变  

Hot compression deformation behavior and microstructure evolution of an Al-Zn-Mg-Cu aluminum alloy

作　　者：郑许[1] 彭斐 朱玉涛[1] 谭自盟 韦修勋 陈愿情[1] 何克准[1] 陈彪 Zheng Xu;Peng Fei;Zhu Yutao;Tan Zimeng;Wei Xiuxun;Chen Yuanqing;He Kezhun;Chen Biao(Guangxi Nannan Aluminum Processing Co.,Ltd.,Nanning 530031,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]广西南南铝加工有限公司,广西南宁530031 [2]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《轻金属》2022年第2期40-46,共7页Light Metals

基　　金：南宁市优秀青年科技创新创业人才培训项目(RC20200101);南宁市创新创业领军人才“邕江计划”项目(2019015);南宁市培养新世纪学术和技术带头人项目(2020002)。

摘　　要：采用Gleeble-1500热模拟机进行热压缩试验,研究了一种Al-Zn-Mg-Cu系7X75铝合金在变形温度300~460℃、应变速率在0.1~8.0 s^(-1)的热变形行为,建立了合金的本构方程,并结合EBSD和TEM对微观组织进行了表征。结果表明:合金的流变应力随着变形温度的升高和应变速率的降低而降低,低应变速率下合金的变形机制为动态回复,在高应变速率下变形机制为动态再结晶;当变形温度为390~410℃、应变速率为1.0~4.0 s^(-1)为最佳热加工区间,合金的主要变形机制为动态再结晶。The hot deformation behavior of Al-Zn-Mg-Cu series 7X75 aluminum alloy during hot compression tests in the temperature range of 300~460℃and the strain rate range of 0.1~8.0 s^(-1) was studied on a Gleeble-1500 thermal mechanical simulator.The constitutive equation of the aluminum alloy was established,and the microstructure was characterized by combining EBSD and TEM.The results indicated that the flow stress of the aluminum alloy decreased with the increase of deformation temperature and the decrease of strain rate.The deformation mechanism of the alloy is dynamic reversion at a low strain rate,which is dynamic recrystallization at a high strain rate.The optimal hot working region is at the deformation temperature of 390~410℃and the strain rate of 1.0~4.0 s^(-1).The main deformation mechanism of the alloy is dynamic recrystallization.

关 键 词：AL-ZN-MG-CU铝合金 热压缩 本构方程 微观组织 再结晶 

分 类 号：TG146.21[一般工业技术—材料科学与工程]