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The first principles study on mechanical propertiesof He doped grain boundary of Al

Lin Li-Bin He Jie Chen Jun Wang Xiao-Zhong

The first principles study on mechanical propertiesof He doped grain boundary of Al

Lin Li-Bin, He Jie, Chen Jun, Wang Xiao-Zhong
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  • Received Date:  31 March 2010
  • Accepted Date:  18 October 2010
  • Published Online:  15 July 2011

The first principles study on mechanical propertiesof He doped grain boundary of Al

  • 1. (1)Department of Physics and Key Laboratory for Radiation Physics and Technologyof Ministry of Education, Sichuan University, Chengdu 610064, China; (2)Institute of Applied Physics and Computational Mathematics, Beijing 100083, China; (3)Institute of Applied Physics and Computational Mathematics, Beijing 100083, China;Department of Physics and Key Laboratory for Radiation Physics and Technologyof Ministry of Education, Sichuan University, Chengdu 610064, China

Abstract: According to the first principles methods, we theoretically study the mechanical properties of He doped AlΣ3 grain boundary (GB). Our results show that He has the lowest formation energy 2.942 eV in GB and low segregation energy 0.085 eV from bulk to GB. Under the extending tensile, the clean GB has a theoretical strength of 8.95 GPa, and the crack appears first from the GB. While, after the He doping, the tensile strength reduces to 7.14 GPa, and one flat effect is present in the curve of strain-stress. By analyzing the variation of the bond-length and the charge distribution, we believe that He-induced reduction of tensile strength is probably ascribed to the weaker interaction between He and Al atoms as well as the weakening Al-Al bonds, owing to the charge screening by full-shell electron structure of He.

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