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<p>Effects of aging treatment on microstructure, tensile properties, impact toughness and three-point bending properties of as-extruded Mg-6Gd-1Y-0.5Zr alloy were investigated. The significant precipitation strengthening effect was involved after aging treatment at 175&#xa0;°C, primarily attributed to the β′ phase. The alloy aged at 175&#xa0;°C for 270&#xa0;h exhibited the best combination of tensile properties, with yield strength of 252&#xa0;MPa, ultimate tensile strength of 354&#xa0;MPa and elongation to rupture of 11.7%. The fracture mode of the alloy changed from plastic to quasi-cleavage with the prolonged aging time. The as-aged alloy exhibited the declined impact toughness with the prolonged aging time, while the as-extruded state showed the highest value of 32.0&#xa0;J·cm<sup>−2</sup>. Notably, the impact toughness at room temperature showed a stronger correlation with elongation to rupture rather than strength. The alloy aged at 175&#xa0;°C for 360&#xa0;h showed the highest bending fracture strength of 666&#xa0;MPa. After bending, the inner zone exhibited the formation of {<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(10\overline{1}{\text{2}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>10</mn> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mtext>2</mtext> </mrow> </math></EquationSource> </InlineEquation>} tensile twins, with a lesser occurrence in the middle and outer zones. As the precipitates in the alloy increased, both the number and the area fraction of twins near the fracture surface decreased.</p>

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Effect of Aging Treatment on Microstructure, Mechanical Properties and Fracture Failure Behavior of As-Extruded Mg-Gd-Y-Zr Alloy

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Qi Wu,
  • Xueqi Jiang,
  • Jihua Chen,
  • Weijun Xia,
  • Hongge Yan,
  • Bin Su,
  • Zhihao Xu

摘要

Effects of aging treatment on microstructure, tensile properties, impact toughness and three-point bending properties of as-extruded Mg-6Gd-1Y-0.5Zr alloy were investigated. The significant precipitation strengthening effect was involved after aging treatment at 175 °C, primarily attributed to the β′ phase. The alloy aged at 175 °C for 270 h exhibited the best combination of tensile properties, with yield strength of 252 MPa, ultimate tensile strength of 354 MPa and elongation to rupture of 11.7%. The fracture mode of the alloy changed from plastic to quasi-cleavage with the prolonged aging time. The as-aged alloy exhibited the declined impact toughness with the prolonged aging time, while the as-extruded state showed the highest value of 32.0 J·cm−2. Notably, the impact toughness at room temperature showed a stronger correlation with elongation to rupture rather than strength. The alloy aged at 175 °C for 360 h showed the highest bending fracture strength of 666 MPa. After bending, the inner zone exhibited the formation of { \(10\overline{1}{\text{2}}\) 10 1 ¯ 2 } tensile twins, with a lesser occurrence in the middle and outer zones. As the precipitates in the alloy increased, both the number and the area fraction of twins near the fracture surface decreased.