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<p>The study on the mechanical performance of lamellar structures of dissimilar titanium alloys at high temperatures is limited. In this work, lamellar structures of dissimilar titanium alloys were produced by the accumulated roll process and used to study the mechanical properties and damage behaviors. The lamellar structures achieved an excellent ultimate tensile strength (UTS) of 1182&#xa0;MPa and a total elongation (TE) of 13.4% at 500 °C, and a UTS of 653&#xa0;MPa and a TE of 129% at 600 °C, respectively. The Ti–15Mo–2.7Nb–3Al–0.2Si alloy layers, with a high density of dislocations and fine α precipitates, act as hard zones, undertaking high stress and restricting plastic strain. The gradient dimple size from the surface to the center affects the uneven distribution of stress and strain in the dissimilar layers. Notably, the formation of heterogeneous dimples across the joints can release the stress concentration and absorb energy, contributing to excellent ductility.</p> Graphical Abstract <p></p>

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Making Lamellar Structures of Dissimilar Titanium Alloys Ductile by Strain Partitioning and Heterogeneous Dimples

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Guochao Li,
  • Xin Chen,
  • Sujung Son,
  • Do Won Lee,
  • Jiaji Wang,
  • Shi Woo Lee,
  • Tianle Li

摘要

The study on the mechanical performance of lamellar structures of dissimilar titanium alloys at high temperatures is limited. In this work, lamellar structures of dissimilar titanium alloys were produced by the accumulated roll process and used to study the mechanical properties and damage behaviors. The lamellar structures achieved an excellent ultimate tensile strength (UTS) of 1182 MPa and a total elongation (TE) of 13.4% at 500 °C, and a UTS of 653 MPa and a TE of 129% at 600 °C, respectively. The Ti–15Mo–2.7Nb–3Al–0.2Si alloy layers, with a high density of dislocations and fine α precipitates, act as hard zones, undertaking high stress and restricting plastic strain. The gradient dimple size from the surface to the center affects the uneven distribution of stress and strain in the dissimilar layers. Notably, the formation of heterogeneous dimples across the joints can release the stress concentration and absorb energy, contributing to excellent ductility.

Graphical Abstract