Processing maps and rate controlling mechanisms of hot deformation of electrolytic tough pitch copper in the temperature range 300-950°C
Processing maps and rate controlling mechanisms of hot deformation of electrolytic tough pitch copper in the temperature range 300-950°C
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DOI：
10.1016/j.msea.2004.08.049
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发表时间：
2005-01-25
期刊：
影响因子：
6.4
通讯作者：
Rao, KP
中科院分区：
文献类型：
--
作者：
Prasad, YVRK;Rao, KP
采用等温热压缩试验研究了电解铜(ETP)在300-950℃温度范围、应变速率0.001-100 s(-1)范围内的热变形行为。在不同的塑性应变下开发加工图，以表征热变形的动力学，同时应用标准动力学分析来评估速率控制机制。加工图显示了三个确定性域，代表 ETP 铜的动态再结晶 (DRX)，并发生在以下温度和应变率范围内：(1) 400-600℃ 和 0.001-0.01 s(-1)、(2) 650-950℃ 和 0.001-3 s(-1) 和 (3) 700-950℃ 和10-100 秒(-1)。虽然所有这些域随着塑性应变的增加而合并，但第一个域的功耗效率较低，第二个域出现在变形早期（应变为 0.1），第三个域出现在较大应变（>0.2）时。加工图上的结果与动力学分析获得的结果具有很好的相关性，并且在这些 DRX 域中估计的表观活化能值分别为 159、198 和 91 KJ/mol，这表明位错核扩散、晶格自扩散和晶界自扩散是速率控制机制。在所有三个 DRX 域中，平均晶粒直径随齐纳-霍洛蒙参数线性变化。 (C) 2004 Elsevier B.V. 保留所有权利。
The hot deformation behavior of electrolytic touch pitch (ETP) copper has been studied in the temperature range 300-950degreesC and strain rate range 0.001-100 s(-1) using isothermal hot compression tests. Processing maps are developed at different plastic strains with a view to characterize the dynamics of hot deformation while the standard kinetic analysis has been applied to evaluate the rate controlling mechanisms. The processing maps have exhibited three deterministic domains representing dynamic recrystallization (DRX) of ETP copper and occuring in the following temperature and strain rate ranges: (1) 400-600degreesC and 0.001-0.01 s(-1), (2) 650-950degreesC and 0.001-3 s(-1) and (3) 700-950degreesC and 10-100 s(-1). While all these domains merge with increasing plastic strain, the first domain has a lower efficiency of power dissipation, the second domain appears early in deformation (strain of 0.1) and the third domain occurs at larger strains (>0.2). The results on processing maps have correlated well with those obtained from kinetic analysis and the apparent activation energy values estimated in these DRX domains are 159, 198 and 91 KJ/mol, respectively, which suggest that dislocation core diffusion, lattice self-diffusion and grain boundary self-diffusion are the rate controlling mechanisms. In all the three DRX domains, the average grain diameter varies linearly with the Zener-Hollomon parameter. (C) 2004 Elsevier B.V. All rights reserved.