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<p>The incompatible deformation of multilayered metallic materials frequently restricts their mechanical performance consistency. This inherent issue is particularly pronounced in body-centered cubic and hexagonal close-packed structured materials, which exhibit poor plasticity, thereby further exacerbating anisotropic behavior. In this study, the growth of dissimilar interfaces in titanium alloys was systematically regulated, and&#xa0;it was discovered that hierarchical interfaces play a dominant role in mechanical anisotropy. The dissimilar interfaces in (α + β) Ti-6Al-4V and metastable β TB8 alloys were adjusted through diffusion bonding at customized temperatures and with specific interlayers to clarify discrepancies in hetero-microstructure evolution and mechanical performance. A nonlocal spectral crystal plasticity method was employed to quantitatively evaluate deformation mechanisms across the interfacial zone. Both experimental and simulation results reveal that heterogeneity across dissimilar interfaces, including variations in chemical composition, grain size, and phase morphology due to atomic interdiffusion and α/β transformations, significantly affects mechanical anisotropy. This work provides insights into regulating interfacial kinetics and optimizing the mechanical properties of dissimilar titanium alloys in additive manufacturing and extrusion sintering processes.</p> Graphical abstract <p></p>

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Integrated computational and experimental analysis on the incompatible plastic deformation of heterostructured Ti-based joints

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Ren-Hao Wu,
  • Hyojin Park,
  • Chen-Xin Gao,
  • Sujung Son,
  • Hao-Wei Liu,
  • Shi Woo Lee,
  • Zaigham Saeed Toor,
  • Tian-Le Li,
  • Hyoung Seop Kim

摘要

The incompatible deformation of multilayered metallic materials frequently restricts their mechanical performance consistency. This inherent issue is particularly pronounced in body-centered cubic and hexagonal close-packed structured materials, which exhibit poor plasticity, thereby further exacerbating anisotropic behavior. In this study, the growth of dissimilar interfaces in titanium alloys was systematically regulated, and it was discovered that hierarchical interfaces play a dominant role in mechanical anisotropy. The dissimilar interfaces in (α + β) Ti-6Al-4V and metastable β TB8 alloys were adjusted through diffusion bonding at customized temperatures and with specific interlayers to clarify discrepancies in hetero-microstructure evolution and mechanical performance. A nonlocal spectral crystal plasticity method was employed to quantitatively evaluate deformation mechanisms across the interfacial zone. Both experimental and simulation results reveal that heterogeneity across dissimilar interfaces, including variations in chemical composition, grain size, and phase morphology due to atomic interdiffusion and α/β transformations, significantly affects mechanical anisotropy. This work provides insights into regulating interfacial kinetics and optimizing the mechanical properties of dissimilar titanium alloys in additive manufacturing and extrusion sintering processes.

Graphical abstract