Strain hardening and softening in a nanocrystalline Ni-Fe alloy induced by severe plastic deformation

被引：46

作者：

Ni, S. ^{[1
]}

Wang, Y. B. ^{[1
]}

Liao, X. Z. ^{[1
]}

Alhajeri, S. N. ^{[2
]}

Li, H. Q. ^{[3
]}

Zhao, Y. H. ^{[4
]}

Lavernia, E. J. ^{[4
]}

Ringer, S. P. ^{[5
]}

Langdon, T. G. ^{[6
,7
]}

Zhu, Y. T. ^{[8
]}

机构：

[1] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia

[2] PAAET, Coll Technol Studies, Dept Mfg Engn, Shuwaikh 70654, Kuwait

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[4] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

[5] Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia

[6] Univ So Calif, Dept Aerosp & Mech Engn & Mat Sci, Los Angeles, CA 90089 USA

[7] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England

[8] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27659 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 09期

基金：

澳大利亚研究理事会; 美国国家科学基金会;

关键词：

Severe plastic deformation; Nanocrystalline materials; Strain softening; Strain hardening; Dislocation density; HIGH-PRESSURE TORSION; GRAIN-GROWTH; MECHANICAL-PROPERTIES; DISLOCATION; TWINS; EVOLUTION; ALUMINUM; METALS; COPPER; AL;

D O I：

10.1016/j.msea.2011.01.017

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The strain response of an electrochemically deposited nanocrystalline Ni-20 wt.% Fe alloy processed by high-pressure torsion (HPT) was investigated by monitoring changes in hardness. Strain hardening was observed in the very early stage of HPT, followed by strain softening before the onset of a second strain hardening stage. Structural investigations revealed that the two hardening stages were associated with an increase in dislocation density, whereas the strain softening stage was accompanied by a reduction in the dislocation and twin densities, thereby demonstrating the main dependence of hardness on the dislocation density in this material. Grain growth occurred during HPT and its role in the hardness evolution is also discussed. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：3398 / 3403

页数：6

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