Analysis of hardness-tensile strength relationships for electroformed nanocrystalline materials

被引：92

作者：

Brooks, I. ^{[1
,2
]}

Lin, P. ^{[1
]}

Palumbo, G. ^{[1
]}

Hibbard, G. D. ^{[2
]}

Erb, U. ^{[2
]}

机构：

[1] Integran Technol Inc, Toronto, ON M9W 4Z6, Canada

[2] Univ Toronto, Dept Mat Sci & Engn, Toronto, ON M5S 3E4, Canada

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 491卷 / 1-2期

关键词：

nanocrystalline materials; electroplating; hardness test; tension test; ductility;

D O I：

10.1016/j.msea.2008.02.015

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Tensile and hardness data from 198 electrodeposited nanocrys alline Ni- and Co-based specimens of varying shape, composition, microstructure and quality were analyzed in order to reveal whether the established hardness-strength relationships in frequent use for conventional coarse-grained metals and alloys can be applied to these ultrafine-grained materials. It was concluded that the H-V = 3.sigma(UTS) expression is a reliable predictor of the relationship between hardness and strength for nanocrystalline electrodeposits, provided the material is ductile enough to sustain tensile deformation up to a discernible peak load and does not instead fracture before the onset of necking instability. On the other hand, the widely used relationship H-V = 3.sigma(Y) was found to be inapplicable to this class of materials owing to the fact that they do not deform in an ideally plastic manner and instead exhibit plastic deformation that is characteristic of strain hardening behaviour. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：412 / 419

页数：8