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<p>Heterostructured materials have emerged as a promising strategy to overcome the strength–ductility trade-off dilemma by synergistically enhancing both strength and ductility. Here, we design a novel heterogeneous 2195 alloy composed of alternating fibrous deformed grain layers and fine recrystallized equiaxed grain layers obtained by hot extrusion. After the T6 treatment, the yield strength of this specimen is 574.8&#xa0;MPa. The ultimate tensile strength reaches 633.4&#xa0;MPa, which is 38&#xa0;MPa higher than that of the sample with a fibrous structure. The elongation is 8.3%, which is 34% higher than that of the sample with a recrystallized equiaxed structure. The excellent mechanical properties arise from the combined effects of texture-induced Schmid factor variations, hetero-deformation induced (HDI) strengthening, and effective dislocation pinning by nanoscale precipitates. HDI strain hardening contributes to the prevention of premature fracture. This research is likely to provide novel perspectives on the fabrication of Al–Li alloys that possess remarkable strength–ductility synergy.</p> Graphical Abstract <p></p>

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Development of Heterostructured 2195 Alloy for Superior Strength–Ductility Synergy Through Hot Extrusion

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Jin Zhang,
  • Jiajun Ding,
  • Zhen Jiang,
  • Dongfeng Shi

摘要

Heterostructured materials have emerged as a promising strategy to overcome the strength–ductility trade-off dilemma by synergistically enhancing both strength and ductility. Here, we design a novel heterogeneous 2195 alloy composed of alternating fibrous deformed grain layers and fine recrystallized equiaxed grain layers obtained by hot extrusion. After the T6 treatment, the yield strength of this specimen is 574.8 MPa. The ultimate tensile strength reaches 633.4 MPa, which is 38 MPa higher than that of the sample with a fibrous structure. The elongation is 8.3%, which is 34% higher than that of the sample with a recrystallized equiaxed structure. The excellent mechanical properties arise from the combined effects of texture-induced Schmid factor variations, hetero-deformation induced (HDI) strengthening, and effective dislocation pinning by nanoscale precipitates. HDI strain hardening contributes to the prevention of premature fracture. This research is likely to provide novel perspectives on the fabrication of Al–Li alloys that possess remarkable strength–ductility synergy.

Graphical Abstract