汽车用5182铝合金板材的温拉伸流变行为  

Flow behavior of 5182 aluminum alloy for automotive body sheet during warn tensile deformation

作　　者：王孟君[1,2] 任杰[1] 黄电源[1] 姜海涛[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082

出　　处：《中国有色金属学报》2008年第11期1958-1963,共6页The Chinese Journal of Nonferrous Metals

基　　金：汽车车身先进设计制造国家重点实验室开放基金资助项目(2005-12)

摘　　要：在变形温度为323～573 K、应变速率为0.001～0.1/s条件下,采用Instron?8032电子拉伸实验机对汽车用5182铝合金板的流变行为进行研究,采用修正后的Fields-Backofen方程描述5182铝合金温拉伸时的流变行为,建立5182铝合金在温拉伸时的应力-应变本构模型。结果表明:在同一应变速率下,合金的流变应力随温度升高而降低;对于较高温度(448、523和573 K)、较低应变速率(ε=0.001/s),合金的流变应力出现明显的峰值应力,表现出动态再结晶特征;随着应变速率增加,合金的流变应力呈现稳态,表现出动态回复特征。The flow behavior of 5182 aluminum alloy for automotive body sheet at the strain rate ranging from 0.001 to 0.1 /s and temperature ranging from 323 to 573 K was studied on Instron-8032 tensile tester. A constitutive equation using up-dated Fields-Backofen equation was established to describe the flow behavior of 5182 aluminum alloy during warm tensile. The results show that at the same strain rate the flow stress reduces with increasing temperature. When the deforming temperatures are high （448, 523 and 573 K） and strain rate is low （0.001 /s）, the flow stress decreases after a peak value with increasing strain, showing continuous dynamic recrystallization. And with increasing strain rate, the steady state flow characteristics appear, showing dynamic recovery.

关 键 词：5182铝合金 温拉伸 流变应力 本构方程 

分 类 号：TG146.21[一般工业技术—材料科学与工程]