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<p>The microstructure and mechanical properties of as-extruded (ER0) and two-pass rolled (ER2) Mg-4.87Y-1.54Zn-0.46Co-0.53Al (wt.%) alloys were comparatively investigated. Compared to the ER0 alloy, the ER2 alloy exhibited significant refinement and dispersion of the second phases along the rolling direction (RD). Concurrently, the ER2 alloy developed a strengthened basal texture and an increased dislocation density, a profusion of low-angle grain boundaries (LAGBs). The tensile tests revealed that the ER2 alloy exhibited the optimal balance of strength and ductility, with yield strength (<i>σ</i><sub>0.2</sub>), ultimate tensile strength (<i>σ</i><sub>b</sub>), and elongation to failure (<i>ε</i><sub>f</sub>) of 354.5&#xa0;MPa, 445.7&#xa0;MPa, and 20.3%, respectively. The ER2 alloy showed improvements of 14.4% in <i>σ</i><sub>0.2</sub> and 11.9% in <i>σ</i><sub>b</sub> over the ER0 alloy. The high tensile strengths of the ER2 alloy mainly originated from grain boundary strengthening, second-phase strengthening and texture strengthening. Its sustained plasticity is primarily ascribed to strain compatibility via LAGBs dislocation transmission, the activation of abundant non-basal slips, and the coordinated deformation of kinking LPSO phases.</p>

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Achieving Strength–Ductility Synergy of the Mg-Y-Zn-Co-Al Alloy via High-Density LAGBs and Multi-scale Precipitates

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Zhichao Wei,
  • Jing Jiang,
  • Guangli Bi,
  • Yuandong Li,
  • Tijun Chen

摘要

The microstructure and mechanical properties of as-extruded (ER0) and two-pass rolled (ER2) Mg-4.87Y-1.54Zn-0.46Co-0.53Al (wt.%) alloys were comparatively investigated. Compared to the ER0 alloy, the ER2 alloy exhibited significant refinement and dispersion of the second phases along the rolling direction (RD). Concurrently, the ER2 alloy developed a strengthened basal texture and an increased dislocation density, a profusion of low-angle grain boundaries (LAGBs). The tensile tests revealed that the ER2 alloy exhibited the optimal balance of strength and ductility, with yield strength (σ0.2), ultimate tensile strength (σb), and elongation to failure (εf) of 354.5 MPa, 445.7 MPa, and 20.3%, respectively. The ER2 alloy showed improvements of 14.4% in σ0.2 and 11.9% in σb over the ER0 alloy. The high tensile strengths of the ER2 alloy mainly originated from grain boundary strengthening, second-phase strengthening and texture strengthening. Its sustained plasticity is primarily ascribed to strain compatibility via LAGBs dislocation transmission, the activation of abundant non-basal slips, and the coordinated deformation of kinking LPSO phases.