Microstructural evolution and mechanical characteristics in nanocrystalline nickel with a bimodal grain-size distribution

被引：61

作者：

Prasad, M. J. N. V. ^{[1
]}

Suwas, S. ^{[1
]}

Chokshi, A. H. ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, Karnataka, India

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 503卷 / 1-2期

关键词：

Nano; Nickel; Texture; Grain growth; Strength; Ductility; SUPERPLASTICITY; DEFORMATION; BEHAVIOR; METALS; SULFUR; ALLOY;

D O I：

10.1016/j.msea.2008.01.099

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

An attractive microstructural possibility for enhancing the ductility of high-strength nanocrystals is to develop a bimodal grain-size distribution, in which the fine grains provide strength, and the coarser grains enable strain hardening. Annealing of nanocrystalline Ni over a range of temperatures and times led to microstructures with varying volume fractions of coarse grains and a change in texture. Tensile tests revealed a drastic reduction in ductility with increasing volume fraction of coarse grains. The reduction in ductility may be related to the segregation of sulphur to grain boundaries. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：86 / 91

页数：6

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