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10期    总第115期    2008年10月

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文章编号:1004-0609(2008)10-1769-06
6082铝合金热变形的本构模型
李雪松,陈 军,张鸿冰

(上海交通大学 国家模具CAD工程研究中心,上海 200030)

摘 要:

利用Gleeble−1500热模拟机,研究6082铝合金在变形温度为300~500 ℃以及应变速率为0.01~10 /s下高温单道次压缩过程的热变形流变应力行为。结果表明:6082铝合金高温单道次压缩下的热变形经历了从应变硬化阶段过渡到稳态变形阶段的过程,其软化机制主要为动态回复。该合金流变应力的大小受变形温度、应变速率的强烈影响,它随变形温度升高而降低,随应变速率提高而增大,说明该合金是一个正应变速率敏感的材料。该合金高温流变应力σ可采用Zener-Hollomon参数的函数来描述,函数表达式中参数Aαn的值分别为3.97×1011 s−1、0.01 MPa−1、9.16;其热变形激活能Q为143.89 kJ/mol。

 

关键字: 6082铝合金;热压缩变形;本构模型

Constitutive model for hot deformation of 6082 aluminum alloy
LI Xue-song, CHEN Jun, ZHANG Hong-bing

National Die & Mold CAD Engineering Research Center, Shanghai Jiao Tong University, Shanghai 200030, China

Abstract: The flow stress behavior of 6082 aluminum alloy was studied by single-pass high temperature compression experiment on Gleeble−1500 thermal-mechanical simulator, over a range of temperature of 300−500 ℃ and a range of strain rate of 0.01−10 /s. The results demonstrate that the hot deformation behavior of 6082 aluminum alloy exhibits strain-hardening to a steady-state, and the softening mechanism was mainly controlled by dynamic recovery (DRV). The value of flow stress is significantly affected by deformation temperature and strain rate, which decreases as temperature becomes higher and as strain rate becomes lower, indicating that 6082 aluminum alloy is a positive strain rate sensitive material. The flow stress of this alloy can be represented by Zener-Hollomon parameter function , and values of related parameters A, α and n, are 3.97×1011 s−1, 0.01 MPa−1 and 9.16, respectively. Its activation energy for hot deformation Q is 143.89 kJ/mol.

 

Key words: 6082 aluminum alloy; hot compression; constitutive model

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

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

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