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<p>This study systematically investigates the evolution of precipitates and twins, as well as their interaction mechanisms, in Mg-Y-Nd-Gd-Zr alloys during dynamic compression. The results indicate that the ultimate compressive strength (UCS) of the alloy subjected to solution treatment at 450&#xa0;°C for 12&#xa0;h is AVIC Heavy Machinery Co., Ltd 210&#xa0;MPa, whereas the UCS of the alloy aged at 250&#xa0;°C for 20&#xa0;h reaches 374&#xa0;MPa, representing a 78% enhancement. As the volume fraction of precipitates increases, a gradual reduction in twin volume fraction is observed, accompanied by a transition in twin type from {10 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\overline{1 }\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> 1}-{10 <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\overline{1 }\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> 2} double twins to {10 <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\overline{1 }\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> 2} tensile twins. Smaller precipitates reorient with twin formation and are engulfed by twins, while larger precipitates impede twin nucleation and growth through dislocation pinning, thereby increasing material strength.</p>

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Effects of Precipitates on Twin Formation and Mechanical Properties of Mg-Y-Nd-Gd-Zr Alloys under Dynamic Compression

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Yu Tang,
  • Mei Luo,
  • Zailin Yang,
  • Wei Li,
  • Haijun Wang,
  • Shuai Zhang,
  • Xing Ran

摘要

This study systematically investigates the evolution of precipitates and twins, as well as their interaction mechanisms, in Mg-Y-Nd-Gd-Zr alloys during dynamic compression. The results indicate that the ultimate compressive strength (UCS) of the alloy subjected to solution treatment at 450 °C for 12 h is AVIC Heavy Machinery Co., Ltd 210 MPa, whereas the UCS of the alloy aged at 250 °C for 20 h reaches 374 MPa, representing a 78% enhancement. As the volume fraction of precipitates increases, a gradual reduction in twin volume fraction is observed, accompanied by a transition in twin type from {10 \(\overline{1 }\) 1 ¯ 1}-{10 \(\overline{1 }\) 1 ¯ 2} double twins to {10 \(\overline{1 }\) 1 ¯ 2} tensile twins. Smaller precipitates reorient with twin formation and are engulfed by twins, while larger precipitates impede twin nucleation and growth through dislocation pinning, thereby increasing material strength.