TA15钛合金中纳米压痕附近残余应力应变场及几何必须位错密度的分布（英文）

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Bibliographic Details
Published in中国有色金属学报：英文版 no. 1; pp. 7 - 13
Main Author 何东 朱景川 来忠红 刘勇 杨夏炜 农智升
Format Journal Article
LanguageEnglish
Published 2013
Subjects
TA15钛合金
几何必须位错
应力应变场
电子背散射衍射
纳米压痕
纳米硬度
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Bibliography:Dong HE,Jing-chuan ZHU,Zhong-hong LAI,Yong LIU,Xia-wei YANG,Zhi-sheng NONG School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China
43-1239/TG
nano-hardness; stress strain fields; geometrically necessary dislocation; nanoindentation; electron backscatter diffraction; TA15 titanium alloy
Nanoindentation and high resolution electron backscatter diffraction（EBSD） were combined to examine the elastic modulus and hardness of α and β phases,anisotropy in residual elastic stress strain fields and distributions of geometrically necessary dislocation（GND） density around the indentations within TA15 titanium alloy.The nano-indention tests were conducted on α and β phases,respectively.The residual stress strain fields surrounding the indentation were calculated through crosscorrelation method from recorded patterns.The GND density distribution around the indentation was calculated based on the strain gradient theories to reveal the micro-mechanism of plastic deformation.The results indicate that the elastic modulus and hardness for α p hase are 129.05 GPas and 6.44 GPa,while for β phase,their values are 109.80 GPa and 4.29 GPa,respectively.The residual Mises stress distribution around the indentation is relatively heterogeneous and significantly influenced by neighboring soft β phase.The region with low residual stress around the indentation is accompanied with markedly high a type and prismatic-GND density.
ISSN:1003-6326