Computer simulation of the initial precipitation processes of γ′ and θ phases

Yuhong Zhao, Zheng Chen, Yongxin Wang, Liying Tang, Yanli Lu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A kinetic model for ternary systems was developed based on the microscopic diffusion form of the phase-field equations describing the precipitation process in binary alloys. The model was used for atomic simulation of the initial precipitation mechanisms of γ′ and θ ordered phases in Ni75Al11V14 and calculation of the order parameters of γ′(Ni3Al) phase. The results show: the γ′ ordered phase precipitated from the disordered matrix by a nonclassical nucleation mechanism accompanied by spinodal decomposition, and an initially formed nonstoichiometric ordered phase later transformed into the stoichiometric one; clusters of V atoms appeared at the γ′ phase boundary resulting in the formation of a nonstoichiometric θ ordered phase; the degree of ordering of the O domain decreases with distance from the γ′-phase boundary. There exists two types of DO22 ordered domains: horizontal and vertical, depending on their adjacent γ′ phase boundary.

Original languageEnglish
Pages (from-to)701-705
Number of pages5
JournalXiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume33
Issue number7
StatePublished - Jul 2004

Keywords

  • Computer analysis
  • Precipitation mechanism
  • Ternary alloy
  • Two ordered phases

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