5083铝合金高温变形行为及加工图  

High-temperature deformation behavior and processing map of 5083 aluminum alloy

作　　者：戴青松[1] 刘栩 付平 张佳琪 邓运来[1,3] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]广西柳州银海铝业股份有限公司,广西柳州545006 [3]中南大学轻合金研究院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2017年第8期1988-1994,共7页Journal of Central South University:Science and Technology

基　　金：广西科学研究与技术开发计划课题(桂科重1598001-2)~~

摘　　要：采用Gleeble-3800热模拟机对5083铝合金进行高温等温压缩实验,研究该合金在变形温度为300~500℃、应变速率为0.0l^10.0 s-1条件下的流变行为,建立合金高温变形的本构方程和加工图,采用电子背散射衍射(EBSD)分析变形过程中合金的组织特征。研究结果表明:流变应力随变形温度升高而降低,随应变速率增大而升高;当变形温度为400~500℃时,合金发生动态再结晶;5083铝合金的高温流变行为可用Zener-Hollomon参数描述,该合金在真应变为0.6时的加工图中存在2个失稳区域,其优选的加工条件是变形温度为420~500℃,应变速率为0.01~0.10 s-1。The flow stress features of 5083 aluminum alloy were studied by the isothermal compression of cylindrical specimen in temperature of 300-500 ℃ and strain rate of 0.01-10.0 s^-1 with Gleeble-3800 simulated machine. The high temperature deformation constitutive equations and processing map were established, and furthermore, the microstructure characteristics were studied by electron back-scattered diffraction（EBSD） analysis. The results show that the flow stress increases with the increase of strain rate and decreases with the increase of deformation temperature. The dynamic recrystallization occurs at the strain rate of 10.0 s-1 and in temperature of 400-500 ℃. The flow stress of 5083 aluminum alloy can be represented by Zener-Hollomon parameter during high temperature deformation. There are two flow instability zones in the processing map when the true strain is 0.6, and the optimized deformation temperature and strain rate are 420-500 ℃ and 0.01-0.10 s^-1, respectively.

关 键 词：5083铝合金 热变形 本构方程 热加工图 

分 类 号：TG146.2[一般工业技术—材料科学与工程]