Short-circuit diffusion in an ultrafine-grained copper-zirconium alloy produced by equal channel angular pressing

被引:126
作者
Amouyal, Y.
Divinski, S. V.
Estrin, Y.
Rabkin, E. [1 ]
机构
[1] Technion Israel Inst Technol, Dept Mat Engn, IL-32000 Haifa, Israel
[2] Univ Munster, Inst Mat Phys, D-48149 Munster, Germany
[3] Monash Univ, Dept Mat Engn, ARC Ctr Excellence Design Light Metals, Clayton, Vic 3800, Australia
[4] CSIRO, Div Mfg & Mat Technol, Clayton, Vic 3168, Australia
基金
以色列科学基金会;
关键词
equal channel angular pressing (ECAP); grain boundaries (GBs); short-circuit diffusion; grain boundary diffusion; copper alloys;
D O I
10.1016/j.actamat.2007.07.026
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Many unusual properties of ultrafine grain materials obtained by equal channel angular pressing (ECAP) are commonly attributed to non-equilibrium grain boundaries. Such grain boundaries are expected to exhibit higher values of energy, higher amplitude of strain fields, a larger free volume and a higher diffusivity than their relaxed counterparts. In the present study, the diffusivity of Ni-63 radiotracer in ECAP-processed Cu-0.17 wt.% Zr alloy was measured in the low-temperature range of 150-350 degrees C under conditions at which no bulk diffusion occurs. The microstructure observations after annealing indicate that alloying with Zr is essential for stabilizing the ECAP-processed alloys against grain growth and recrystallization. In all samples studied the experimentally measured diffusion profiles exhibited two distinct slopes, which are associated with "slow" and "fast" short-circuit diffusion paths. The diffusivity of "slow" diffusion paths in the ECAP-processed samples coincides with the diffusivity via relaxed grain boundaries in the coarse grain Cu measured by the same radiotracer method at similar temperatures. We associate the "fast" diffusion paths observed in this study with the non-equilibrium grain boundaries produced by ECAP. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:5968 / 5979
页数:12
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