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<p>The microstructure and mechanical properties of as-cast and heat-treated Mg-6.5Gd-5.6Y-0.1Nd-0.01Ce−0.4Zr-xAg (x = 0, 1.0, 1.5, and 2.0 wt.%) alloys were studied. The results show that as the Ag content increases, the grain size of the alloys first decreases and then increases. The grain size is smallest when the Ag content is 1.5%. The eutectic phases of Mg3Gd and Mg24Y<sub>5</sub> are observed in the 0Ag- and Ag-containing alloys, and a new phase of Ag2Gd is observed after the addition of Ag. Compared with the 0Ag alloy, the Ag-containing alloy exhibits a more apparent age-hardening response during aging treatment. In addition, high-density and fine β′ precipitates and γ″ precipitates are observed in the Ag-containing alloys after aging treatment, whereas only β′ precipitates are observed in the 0Ag alloy; moreover, with the addition of Ag, the β′ precipitates are refined and have a higher density. The mechanical properties at room temperature gradually increase with the addition of Ag, and when the Ag content reaches 2%, the alloy has the best tensile properties. The yield strength, ultimate tensile strength, and elongation are 263.5 MPa, 303.2 MPa, and 1.15%, respectively. Compared with those of the 0Ag alloy, the yield strength and tensile strength increase by 46.3 and 55.6 MPa, respectively.</p>

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Effect of Ag on the Microstructure and Mechanical Properties of Mg-6.5Gd-5.6Y-0.1Nd-0.01Ce−0.4Zr Alloy

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Shuang Guo,
  • Xizao Wang,
  • Tianjiao Luo,
  • Yingju Li,
  • Xiaohui Feng,
  • Qiuyan Huang,
  • Ce Zheng,
  • Cheng Zhu,
  • Yuansheng Yang,
  • Weirong Li,
  • Feng Li

摘要

The microstructure and mechanical properties of as-cast and heat-treated Mg-6.5Gd-5.6Y-0.1Nd-0.01Ce−0.4Zr-xAg (x = 0, 1.0, 1.5, and 2.0 wt.%) alloys were studied. The results show that as the Ag content increases, the grain size of the alloys first decreases and then increases. The grain size is smallest when the Ag content is 1.5%. The eutectic phases of Mg3Gd and Mg24Y5 are observed in the 0Ag- and Ag-containing alloys, and a new phase of Ag2Gd is observed after the addition of Ag. Compared with the 0Ag alloy, the Ag-containing alloy exhibits a more apparent age-hardening response during aging treatment. In addition, high-density and fine β′ precipitates and γ″ precipitates are observed in the Ag-containing alloys after aging treatment, whereas only β′ precipitates are observed in the 0Ag alloy; moreover, with the addition of Ag, the β′ precipitates are refined and have a higher density. The mechanical properties at room temperature gradually increase with the addition of Ag, and when the Ag content reaches 2%, the alloy has the best tensile properties. The yield strength, ultimate tensile strength, and elongation are 263.5 MPa, 303.2 MPa, and 1.15%, respectively. Compared with those of the 0Ag alloy, the yield strength and tensile strength increase by 46.3 and 55.6 MPa, respectively.