Mechanical properties of single crystal tungsten microwhiskers characterized by nanoindentation

被引：55

作者：

Huang, H. ^{[1
]}

Wu, Y. Q. ^{[1
]}

Wang, S. L. ^{[2
]}

He, Y. H. ^{[2
]}

Zou, J. ^{[1
,3
]}

Huang, B. Y. ^{[2
]}

Liu, C. T. ^{[4
]}

机构：

[1] Univ Queensland, Sch Engn, Brisbane, Qld 4072, Australia

[2] Cent S Univ, Sch Phys Sci & Technol, State Key Lab Powder Met, Changsha 410083, Peoples R China

[3] Univ Queensland, Ctr Microscopy & Microanal, Brisbane, Qld 4072, Australia

[4] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 523卷 / 1-2期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

Tungsten; Microwhisker; Hardness; Elastic modulus; Nanoindentation; DEFORMATION; STRENGTH;

D O I：

10.1016/j.msea.2009.05.060

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The nanoindentation results in this work showed that the one-dimensional single crystal tungsten microwhiskers; fabricated by vapor deposition possess unique yielding behavior. The average hardness of the microwhiskers measured on their (1 1 1) surfaces was 8.44 GPa, significantly higher than that of the bulk tungsten ranged from 3.4 to 5.8 GPa. The hardness increase was attributed to the lacking of dislocation avalanche in the 1D single crystal tungsten that was often observed in the nanoindentation of the bulk tungsten. However, the values of elastic modulus of the microwhiskers; measured on the (1 11) surfaces were considerably scattered, whose average value is much lower than the reported value of 410 GPa for the bulk tungsten. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：193 / 198

页数：6

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