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<p>The microstructure-property is essential important and complicated to be explored in metals. A novel multi-variant γ phase with nano-lamella incorporating multi-interface microstructure brings the special strength-ductility in Ti–Al alloys, the formation and selection of multi-variant interfaces are attractive questions. The phase-field simulations reveal the interface priority selection in the nucleation of γ variant with three kinds of interface, twin boundary (TB), pseudo-twin boundary (PTB) and ordered domain boundary (ODB), the low ratio of TB at nucleation stage transforms to the large ratio at growth stage, the interface elastic strain energy drives the γ variant selection. The findings reveal the role of interface elastic strain in facilitating the preferential development of specific γ variant, correlating an increase in TB with the escalation of elastic strain energy.</p> Graphical abstract <p></p>

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Interface and strain energy driven variant selection in lamellar Ti–Al alloys

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月13日

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  • Zan Zhang,
  • Jicheng Zhuo,
  • Kunning Niu,
  • Haiwei Zhang,
  • Peng Sang,
  • Shenglong Wang,
  • Yongsheng Li

摘要

The microstructure-property is essential important and complicated to be explored in metals. A novel multi-variant γ phase with nano-lamella incorporating multi-interface microstructure brings the special strength-ductility in Ti–Al alloys, the formation and selection of multi-variant interfaces are attractive questions. The phase-field simulations reveal the interface priority selection in the nucleation of γ variant with three kinds of interface, twin boundary (TB), pseudo-twin boundary (PTB) and ordered domain boundary (ODB), the low ratio of TB at nucleation stage transforms to the large ratio at growth stage, the interface elastic strain energy drives the γ variant selection. The findings reveal the role of interface elastic strain in facilitating the preferential development of specific γ variant, correlating an increase in TB with the escalation of elastic strain energy.

Graphical abstract