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：59

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

页码：11 / 21

页数：11

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