Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第11期    总第116期    2008年11月

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文章编号:1004-0609(2008)11-1958-06
汽车用5182铝合金板材的温拉伸流变行为
王孟君1, 2,任 杰1,黄电源1,姜海涛1

(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
)

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( =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。

 

关键词: 5182铝合金;温拉伸;流变应力;本构方程

Flow behavior of 5182 aluminum alloy for automotive body sheet during warn tensile deformation
WANG Meng-jun1, 2, REN Jie1, HUANG Dian-yuan1, JIANG Hai-tao1

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha 410082, China

Abstract: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.

 

Key words: 5182 aluminum alloy; warm tensile; flow stress; constitutive equation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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