均匀化处理的6063铝合金的热压缩变形行为及组织演变  

Hot Compression Deformation Behaviors and Microstructure Evolution of 6063 Aluminum Alloy Treated by Homogenization

作　　者：余珠华 张大童[1] 张文[1] 邱诚[1] YU Zhuhua, ZHANG Datong, ZHANG Wen, QIU Cheng(National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, Chin)

机构地区：[1]华南理工大学国家金属材料近净成形工程技术研究中心

出　　处：《热加工工艺》2018年第5期58-61,67,共5页Hot Working Technology

基　　金：广东省科技计划项目(2015B090926004)

摘　　要：为了考察6063铝合金在较高应变速率下的变形行为,采用Gleeble-3500热模拟试验机对合金在变形温度390～510℃和应变速率1～20 s^（-1）进行热压缩试验。结果表明：流动应力随着变形温度的升高而降低,随着应变速率的增大而升高。在应变速率为1～10 s^（-1）时,流动应力随着应变增加逐渐进入稳态流动阶段;在应变速率为20 s^（-1）时,流动应力达到峰值后随应变量增加而下降。通过热加工图获得适宜的热变形工艺参数为：变形温度460～490℃,应变速率2～6.3 s^（-1）。合金在失稳区发生局部流动和剪切变形,在安全加工区域组织更均匀。随着温度升高和应变速率下降,位错密度减小,合金发生动态再结晶。In order to investigate the deformation behavior of 6063 aluminum alloy at higher strain rate, the thermal compression test of the alloy at deformation temperature of 390-510℃ and strain rate of 1-20 s ^-1 was done by using Gleeble-3500 thermal simulator. The results show that the flow stress decreases with the increase of deformation temperature, and increases with the increase of strain rate. When the strain rate is 1-10 s^-1, the flow stress gradually gets into the steady flow stage with the increase of strain; when the strain rate is 20s^-1, after the flow stress reaches the peak, it decreases with the increase of strain. The appropriate thermal deformation technological parameters obtained by hot processing map are deformation temperature of 460-490℃ and the strain rate of 2-6.3 s^-1. Local flow and shear deformation of the alloy occur in the instability zone, while the microstructure in the safe area is more homogenous. With the increase of temperature and the decrease of strain rate, the dislocation density decreases and the dynamic recrystallization in the alloy occurs.

关 键 词：6063铝合金 热压缩变形 热加工图 微观组织 

分 类 号：TG301[金属学及工艺—金属压力加工] TG379