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)10-1775-06
7039铝合金高温的热变形行为
蔡一鸣1,李慧中2, 3,梁霄鹏2, 3,汤国建1

(1. 国防科技大学 航天与材料工程学院,长沙 410073;
2. 中南大学 材料科学与工程学院,长沙 410083;
3. 中南大学 有色金属材料科学与工程教育部重点实验室,长沙 410083
)

摘 要:

采用圆柱试样在Gleeble−1500材料热模拟实验机上对7039铝合金进行高温等温压缩实验,研究了该合金在变形温度为300~500 ℃,应变速率为0.01~10 /s条件下的流变变形行为。结果表明:变形温度和应变速率对合金流变应力的大小有显著影响,流变应力随变形温度的升高而降低,随应变速率的增加而升高;在应变速率 <10 /s条件下合金表现出动态回复特征,而应变速率 =10 /s时,合金发生了局部动态再结晶。7039铝合金的高温流变行为可用Zener­­-Hollomon参数描述。从流变应力、应变速率和变形温度的相关性,得出了该合金高温变形时的四个材料常数。

 

关键词: 7039铝合金;热压缩变形;流变应力;Zener¬¬-Hollomon参数;变形激活能

Thermal deformation behavior for 7039 aluminum alloy at elevated temperature
CAI Yi-ming1, LI Hui-zhong2, 3, LIANG Xiao-peng2, 3, TANG Guo-jian1

1. College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China;
2. School of Materials Science Engineering, Central South University, Changsha 410083, China;
3. Key Laboratory of Nonferrous Materials, Ministry of Education, Central South University, Changsha 410083, China

Abstract:The flow stress features of 7039 aluminum alloy were studied by isothermal compression of cylindrical specimen at 300−500 ℃ and strain rate of 0.01−10 /s with Gleeble−1500 simulated machine. The results show that the flow stress is controlled by strain rate and deformation temperature. The flow stress increases with strain rate increasing and decreases with deformation temperature increasing. The 7039 aluminum alloy shows the phenomenal of dynamic recovery at the strain rates less than 10 /s; the alloy shows the phenomenal of partial dynamic recrystallization at the strain rates higher than 10 /s. The flow stress of 7039 aluminum alloy during high temperature deformation can be represented by Zener¬¬-Hollomon parameter. Four material constants of the alloy during plastic deformation at high temperature are derived from the interdependencies of flow stress, strain rate and temperature.

 

Key words: 7039 aluminum alloy; hot compression deformation; flow stress; Zener¬¬-Hollomon parameter; thermal deformation activation energy

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

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

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