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<p>This study presents a comprehensive investigation of the effects of 1.8 wt.% Al addition on the microstructural evolution and mechanical behavior of Mg-1.0Sn-0.5Ca (wt.%) alloys. The findings reveal that Al alloying promotes the generation of a higher volume fraction of secondary phases (CaMgSn: 1.29% → CaMgSn + Al<sub>2</sub>Ca: 2.55%). This increase is attributed to a broadening of the solidification interval available for secondary phase formation, as validated by Pandat-based Scheil-Gulliver solidification pathway simulations. Notably, Al addition also induces a fundamental texture transformation, evolving from an ED-tilted bimodal texture (TX10 alloy) to a weakened, symmetrical and almost circular texture (TXA102 alloy), mainly originating from the PSN mechanism via coarse CaMgSn phase and the more vigorous activation of prismatic slip (confirmed by first-principles calculations). Mechanical characterization demonstrates that Al-containing TXA102 alloy achieves exceptional consistency in yield strength across tensile orientations, contrasting sharply with the pronounced anisotropy observed in the TX10 alloy. The relative VPSC simulations further elucidate the textural variation governing tensile direction-dependent deformation mechanism selection</p>

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Al Addition Induced Mechanical Enhancement and Anisotropy Reduction in Mg-Sn-Ca Alloy: Actual Experiments Coupled with VPSC Simulation and First-Principles Calculations

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Dan Zhu,
  • Yanfu Chai,
  • Yuchen Dou,
  • Dabiao Xia,
  • Qinghang Wang

摘要

This study presents a comprehensive investigation of the effects of 1.8 wt.% Al addition on the microstructural evolution and mechanical behavior of Mg-1.0Sn-0.5Ca (wt.%) alloys. The findings reveal that Al alloying promotes the generation of a higher volume fraction of secondary phases (CaMgSn: 1.29% → CaMgSn + Al2Ca: 2.55%). This increase is attributed to a broadening of the solidification interval available for secondary phase formation, as validated by Pandat-based Scheil-Gulliver solidification pathway simulations. Notably, Al addition also induces a fundamental texture transformation, evolving from an ED-tilted bimodal texture (TX10 alloy) to a weakened, symmetrical and almost circular texture (TXA102 alloy), mainly originating from the PSN mechanism via coarse CaMgSn phase and the more vigorous activation of prismatic slip (confirmed by first-principles calculations). Mechanical characterization demonstrates that Al-containing TXA102 alloy achieves exceptional consistency in yield strength across tensile orientations, contrasting sharply with the pronounced anisotropy observed in the TX10 alloy. The relative VPSC simulations further elucidate the textural variation governing tensile direction-dependent deformation mechanism selection