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Residual elastic stress–strain field and geometrically necessary dislocation density distribution around nano-indentation in TA15 titanium alloy

He, Dong ; Zhu, Jing-Chuan ; Lai, Zhong-Hong ; Liu, Yong ; Yang, Xia-Wei ; Nong, Zhi-Sheng

Transactions of Nonferrous Metals Society of China, January 2013, Vol.23(1), pp.7-13 [Peer Reviewed Journal]

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  • Title:
    Residual elastic stress–strain field and geometrically necessary dislocation density distribution around nano-indentation in TA15 titanium alloy
  • Author: He, Dong ; Zhu, Jing-Chuan ; Lai, Zhong-Hong ; Liu, Yong ; Yang, Xia-Wei ; Nong, Zhi-Sheng
  • Description: 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 cross-correlation 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 phase 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 〈 〉 type and prismatic-GND density.
  • Is Part Of: Transactions of Nonferrous Metals Society of China, January 2013, Vol.23(1), pp.7-13
  • Identifier: ISSN: 1003-6326 ; DOI: 10.1016/S1003-6326(13)62422-X
  • Subjects: Nano-Hardness ; Stress–Strain Fields ; Geometrically Necessary Dislocation ; Nanoindentation ; Electron Backscatter Diffraction ; Ta15 Titanium Alloy ; Engineering
  • Language: English

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