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张文,高选乔,胡忠武,李来平,程军,张平祥.钨单晶纳米压痕尺寸效应研究[J].稀有金属材料与工程(英文),2017,46(12):3626~3632.[Zhang Wen,Gao Xuanqiao,Hu Zhongwu,Li Laiping,Cheng Jun,Zhang Pingxiang.Study on Nanoindentation Size Effect of Tungsten Single Crystal[J].Rare Metal Materials and Engineering,2017,46(12):3626~3632.]
Study on Nanoindentation Size Effect of Tungsten Single Crystal
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Received:August 07, 2017  Revised:September 15, 2017
DOI:
Key words: Tungsten single crystal  Nanoindentation  Elastic modulus  Indentation size effect
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Author NameAffiliationE-mail
Zhang Wen Northwestern Polytechnical University,Xi’an zhangw@mail.nwpu.edu.cn 
Gao Xuanqiao Northwest Institute for Nonferrous Metal Research,Xi’an  
Hu Zhongwu Northwest Institute for Nonferrous Metal Research,Xi’an  
Li Laiping Northwest Institute for Nonferrous Metal Research,Xi’an  
Cheng Jun Northwest Institute for Nonferrous Metal Research,Xi’an  
Zhang Pingxiang Northwestern Polytechnical University,Xi’an  
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Abstract:
      The load-displacement curves, elastic modulus, indent morphology, nanohardness and elastic recovery of high purity tungsten single crystal were investigated by nanoindentation and scanning probe microscopy. W (111) crystal plane undergoes elastic deformation and plastic deformation during the loading-unloading process, and the load-displacement curve does not show discontinuity, which demonstrates that cracks and brittle fracture are not formed in the indents. Moreover, the pile-up behavior around indents reveals that tungsten single crystal has the low work hardening tend. The nanohardness and elastic modulus of tungsten single crystal were measured by continuous stiffness measurement (CSM), and a size effect on the nanohardness and elastic modulus of tungsten single crystal was observed, which decrease with the increase of indentation depth. The Nix-Gao model was employed to analyze the nanoindentation mechanical characteristics of tungsten single crystals, and the characteristic length(h*), the intrinsic hardness in the limit of infinite depth(H0) and size effect index(m) were calculated to be 1490nm, 6.79GPa and 0.18 respectively, which indicates that tungsten single crystal has a significant size effect when the indentation depth is below about 1490nm, and the size effect becomes more insignificant when indentation depth is above 1490nm.When the impression is deeper than 2450nm, the nanoindentation size effect on the hardness will disappear.