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<p>In this work, the microstructure, mechanical property and corrosion behavior of Mg-8Gd-0.1Sn (wt.%) and Mg-8Gd-0.1Sn-0.15In (wt.%) samples were investigated. The results show that both Mg alloys exhibit bimodal grain structure, including the fine dynamically recrystallized (DRXed) grains and coarse un-recrystallized (un-DRXed) grains with strong fiber texture. The yield strength (YS) and ultimate tensile strength (UTS) of the tensile Mg-8Gd-0.1Sn alloy at room temperature are ~ 253&#xa0;MPa and ~ 282&#xa0;MPa, respectively, and the elongation (EL) is ~ 2.7%. With the addition of the In element, the DRXed grains proportion of Mg-Gd-Sn-In alloy decreases and the DRXed grain size is refined. The intensity of &lt; 10 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\overline{1}\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>1</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation> 0 &gt; // extrusion direction (ED) texture is enhanced, and the number density of the Mg-Gd-Sn phases is increased. The room temperature YS and UTS values of Mg-Gd-Sn-In sample are increased to ~ 279&#xa0;MPa and ~ 310&#xa0;MPa, respectively, and the EL is increased to ~ 3.7%. The corrosion rate decreases from 0.84&#xa0;mm/y in the Mg-Gd-Sn alloy to the 0.69&#xa0;mm/y in the Mg-Gd-Sn-In alloy. The improvement of corrosion resistance is related to the addition of In element, which makes the corrosion film denser and strengthens the corrosion barrier effect of precipitated phase. The relevant results can guide the design and fabrication of new corrosion resistant and high-strength Mg alloys.</p>

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Mechanical Property and Corrosion Resistance of the Newly Developed Mg-Gd-Sn-(In)-Based Alloys

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Xiangzhong Zhao,
  • Hucheng Pan,
  • Sheng Wang,
  • Zhen Pan,
  • Zhihao Zeng,
  • Zhilei Li,
  • Xiaonan Cui,
  • Shengxuan Xu,
  • Gaowu Qin

摘要

In this work, the microstructure, mechanical property and corrosion behavior of Mg-8Gd-0.1Sn (wt.%) and Mg-8Gd-0.1Sn-0.15In (wt.%) samples were investigated. The results show that both Mg alloys exhibit bimodal grain structure, including the fine dynamically recrystallized (DRXed) grains and coarse un-recrystallized (un-DRXed) grains with strong fiber texture. The yield strength (YS) and ultimate tensile strength (UTS) of the tensile Mg-8Gd-0.1Sn alloy at room temperature are ~ 253 MPa and ~ 282 MPa, respectively, and the elongation (EL) is ~ 2.7%. With the addition of the In element, the DRXed grains proportion of Mg-Gd-Sn-In alloy decreases and the DRXed grain size is refined. The intensity of < 10 \(\overline{1}\) 1 ¯ 0 > // extrusion direction (ED) texture is enhanced, and the number density of the Mg-Gd-Sn phases is increased. The room temperature YS and UTS values of Mg-Gd-Sn-In sample are increased to ~ 279 MPa and ~ 310 MPa, respectively, and the EL is increased to ~ 3.7%. The corrosion rate decreases from 0.84 mm/y in the Mg-Gd-Sn alloy to the 0.69 mm/y in the Mg-Gd-Sn-In alloy. The improvement of corrosion resistance is related to the addition of In element, which makes the corrosion film denser and strengthens the corrosion barrier effect of precipitated phase. The relevant results can guide the design and fabrication of new corrosion resistant and high-strength Mg alloys.