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    Abstract:

    The influence of Ni-Al interatomic potential from the first-nearest neighbor to the fourth-nearest neighbor on the precipitation process of L10 pre-precipitation phase in Ni75Al14Cr11 alloy was investigated by the Microscopic Phase-Field method. As the third-nearest Ni-Al interatomic potential increases or the fourth-nearest interatomic potential decreases, L10 pre-precipitation phase and L12 phase appears in advance; besides, the volume fraction of L10 pre-precipitated phase decreases while the final volume fraction of L12 phase almost remains unchanged. Whereas the opposite, L10 pre-precipitation phase and L12 phase appears later; besides, the volume fraction of both phases increases. Compared with the above two, the first-nearest interatomic potential has the less impact and the second-nearest Ni-Al interatomic potential has the least impact on the precipitation process of L10 pre-precipitation phase and L12 phase. Further research shows that Ni-Al interatomic potential does not affect the precipitation mechanism of the alloy and will affect the precipitation time, speed, volume fraction and precipitation morphology of L10 pre-precipitation phase and L12 equilibrium phase, thus affecting the structure and properties of Ni75Al14Cr11 superalloy, which has guiding significance for alloy optimization design.

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[dongweiping, Wang Bin, Gong Ningning, Chen Zheng. Phase-field simulation for influence of Ni-Al interatomic potential on L10 pre-precipitation phase of Ni75Al14Cr11 alloy[J]. Rare Metal Materials and Engineering,2020,49(1):169~176.]
DOI:10.12442/j. issn.1002-185X.20181177

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History
  • Received:November 23,2018
  • Revised:December 24,2018
  • Adopted:January 10,2019
  • Online: February 16,2020