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A two-mode phase field crystal study of evolution of grain boundaries and dislocations involved in hexagonal to square phases transformation
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TG113

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Natural Science Foundation of China,National Key Basic Research Program of China

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    Abstract:

    A comprehensive understanding on interaction among grains, boundaries, strain and dislocations are beneficial for microstructure optimization and properties enhancement. A two-mode phase field crystal (PFC) method is employed to focus on hexagonal to square phases transformation. Hexagonal phases with a misorientation of 6° and tilt angle of 0 °, 15°, 30°, and 45° are checked. The hexagonal grains grow up, coalesce and form coherent grain boundaries with dislocation sets in two orientations. Square phases nucleate on these dislocation sets and their orientations are determined by these dislocation sets. These square grains of each case have two variants, which the misorientations are 30°, 30°, 10°, and 5° when tilt angles are 0 °, 15°, 30°, and 45°. Square grains of different orientation grow and ripen in different pace, the grains that locate on preferential orientation will dominate. Dislocation sets are generated to relieve strain concentration that rises from grain growth with coherent boundaries.

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[Wu Lu, Pan Rongjian, Zhang Wei, Chen Zheng, Zhang Jing. A two-mode phase field crystal study of evolution of grain boundaries and dislocations involved in hexagonal to square phases transformation[J]. Rare Metal Materials and Engineering,2020,49(12):4103~4111.]
DOI:10.12442/j. issn.1002-185X.20190956

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History
  • Received:November 14,2019
  • Revised:December 11,2020
  • Adopted:February 21,2020
  • Online: January 13,2021
  • Published: