Effect of heat treatment on diffusion, internal friction, microstructure and mechanical properties of ultra-fine-grained nickel severely deformed by equal-channel angular pressing

被引：56
|
作者：
Divinski, Sergiy V. [1 ]
Reglitz, Gerrit [1 ]
Golovin, Igor S. [2 ]
Peterlechner, Martin [1 ]
Lapovok, Rimma [3 ]
Estrin, Yuri [3 ,4 ]
Wilde, Gerhard [1 ]
机构：
[1] Univ Munster, Inst Mat Phys, D-48149 Munster, Germany
[2] Natl Univ Sci & Technol MISiS, Dept Phys Met Nonferrous Met, Moscow 119049, Russia
[3] Monash Univ, Dept Mat Engn, Ctr Adv Hybrid Mat, Clayton, Vic 3168, Australia
[4] Natl Univ Sci & Technol MISiS, Lab Hybrid Nanostruct Mat, Moscow 119049, Russia
来源：
ACTA MATERIALIA | 2015年 / 82卷
关键词：
SPD; ECAP; Grain boundary diffusion; Microhardness; Internal friction; SEVERE PLASTIC-DEFORMATION; BOUNDARY DIFFUSION; SELF-DIFFUSION; NANOSTRUCTURED METALS; COPPER; NI; ECAP; CU; RECRYSTALLIZATION; DISLOCATIONS;
D O I：
10.1016/j.actamat.2014.08.064
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Severe plastic deformation via equal-channel angular pressing was shown to induce characteristic ultra-fast diffusion paths in Ni (Divinski et al., 2011). The effect of heat treatment on these paths, which were found to be represented by deformation-modified general high-angle grain boundaries (GBs), is investigated by accurate radiotracer self-diffusion measurements applying the Ni-63 isotope. Redistribution of free volume and segregation of residual impurities caused by the heat treatment triggers relaxation of the diffusion paths. A correlation between the GB diffusion kinetics, internal friction, microstructure evolution and microhardness changes is established and analyzed in detail. A phenomenological model of diffusion enhancement in deformation-modified GBs is proposed. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：11 / 21
页数：11
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