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Study on {110} plane dislocation core structure and Peierls stress of B2 aldy
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O469

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China Postdoctoral Science Foundation

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    Abstract:

    Dislocation properties of {110} in Al-Dy intermetallic compound with B2 structure were studied by truncation approximation.The results show that the Burgess vector is <110>, the core width of the directional screw, edge and mixed dislocation should be greater than <100> irection. Their corresponding unstable stratification energy is present γus<110> < γus<001>. It can be seen that the unstable stratification energy is one of the important factors affecting the dislocation properties of intermetallic compounds with B2 structure. B2-AlDy slip system is <111>. For the dislocation of {110}, except for the dislocation with a dislocation Angle of 54.7°, the elastic strain energy of other dislocation angles is greater than the misfit energy, and their phases are always opposite in the same period.When the dislocation Angle is 54.7°, the misfit energy is greater than the elastic strain energy, and both of them are in phase in the same period. In general, for the {110} plane of B2-AlDy, <100>, <110> and <111> direction of dislocation, with the reduction of dislocation angle (except the <111> direction for the dislocation angle of 54.7°), the total energy and the corresponding stress increase in turn.

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[Li Shaorong. Study on {110} plane dislocation core structure and Peierls stress of B2 aldy[J]. Rare Metal Materials and Engineering,2021,50(3):867~875.]
DOI:10.12442/j. issn.1002-185X.20200744

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History
  • Received:September 23,2020
  • Revised:October 21,2020
  • Adopted:October 23,2020
  • Online: April 02,2021
  • Published: