Kinetics and dynamics of hot deformation of OFHC copper in extended temperature and strain rate ranges

被引:9
作者
Prasad, YVRK [1 ]
Rao, KP [1 ]
机构
[1] City Univ Hong Kong, Dept Mfg Engn & Engn Management, Kowloon, Hong Kong, Peoples R China
来源
ZEITSCHRIFT FUR METALLKUNDE | 2005年 / 96卷 / 01期
关键词
OFHC copper; hot deformation; processing maps; kinetic analysis; dynamic recrystallization;
D O I
10.3139/146.018074
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The hot-deformation behavior of oxygen-free high-conductivity (OFHC) copper has been studied in the temperature range 300-950degreesC and strain rate range 0.001-100s(-1) using hot-compression tests. The dynamics of the behavior is studied with the help of processing maps, and the-rate controlling processes are evaluated using the standard kinetic rate equation. The processing maps exhibited two domains: (1) in the temperature range 600-900degreesC and strain rate range 0.01-10 s(-1), (2) in the range 750-950degreesC and 30-100 s-1. From kinetic analysis of the flow stress data, apparent activation energy values of 159 kJ/mole and 75 kJ/mole have been estimated in the above two domains, respectively. These values suggest that dislocation core self-diffusion and grain boundary self-diffusion are the rate-controlling mechanisms. In both these domains, the average grain diameter varies linearly with the Zener-Hollomon parameter.
引用
收藏
页码:71 / 77
页数:7
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