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<p>The D0<sub>22</sub> precipitate is an important strengthening phase of materials applying to turbines of the electric generators and aero-engines. This paper presents the study of ultra-early structure transition process of D0<sub>22</sub> Ni<sub>3</sub>V during its precipitation by building an atomic-scale phase-field model of A1 to D0<sub>22</sub>. Results reveal that the Ni<sub>3</sub>V undergoes three stages: nucleation, growth and ordering. Two kinds of variants are generated during the precipitation; the in situ cubic to tetragonal ordering transition of D0<sub>22</sub> roots in an initial matrix cell consisting of four face-centered cubic lattice instead of a cell containing two face-centered cubic lattice; planes of mature D0<sub>22</sub> have different ordering degrees and the calculated degree of order suggests that low aging temperature avails long-range order for the aimed superalloy.</p>

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The Ultra-Early Structure Transition of D022 Ni3V During the Precipitation: A Phase-Field Study

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Kun Wang,
  • Wenlai Ma,
  • Yumei Zhang,
  • Zhenghua Fu

摘要

The D022 precipitate is an important strengthening phase of materials applying to turbines of the electric generators and aero-engines. This paper presents the study of ultra-early structure transition process of D022 Ni3V during its precipitation by building an atomic-scale phase-field model of A1 to D022. Results reveal that the Ni3V undergoes three stages: nucleation, growth and ordering. Two kinds of variants are generated during the precipitation; the in situ cubic to tetragonal ordering transition of D022 roots in an initial matrix cell consisting of four face-centered cubic lattice instead of a cell containing two face-centered cubic lattice; planes of mature D022 have different ordering degrees and the calculated degree of order suggests that low aging temperature avails long-range order for the aimed superalloy.