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Abstract <p>To study the effect of a rare-earth element on the microstructure and mechanical properties of aluminum alloys, Al–Mg–Zn alloys with different Sc content were prepared, and microstructure, tensile strength, and microhardness of the alloys were studied. Results show that the alloys change from coarse strip-like grains to fine and uniform equiaxed grains with Sc content from 0 to 0.6 wt %, and grain size is reduced from 131.1 to 43.4 μm. Eutectic Al<sub>3</sub>Sc particles form alongside with the MgZn<sub>2</sub> phase in the Al–2.5Mg–6Zn–0.45Sc and Al–2.5Mg–6Zn–0.6Sc alloys; primary Al<sub>3</sub>Sc phases form in an Al–2.5Mg–6Zn–0.6Sc. Microhardness of the alloys increases with increasing of Sc content and reaches maximum of 153.1 HV for the case of Al–2.5Mg–6Zn–0.6Sc, which is 16.2% higher than that of Al–2.5Mg–6Zn. Tensile strength increases with increasing of Sc and reaches maximum of 353.0&#xa0;MPa for Al–2.5Mg–6Zn–0.6Sc, which is 9.5% higher than that of Al–2.5Mg–6Zn. Strength improvement of alloys results in grain refinement strengthening, secondary phase strengthening, and solid-solution strengthening by addition of Sc. Elongation of Al–2.5Mg–6Zn alloys first increases, then decreases with increasing of Sc content, then elongation of Al–2.5Mg–6Zn–0.3Sc reaches maximum of 13.6%. An increase in elongation of the alloys is the result of grain refinement effect, and a decrease of elongation is the result of the increase in the coarse Al<sub>3</sub>Sc phase formed in the alloys.</p>

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Effect of Rare-Earth Element Sc on Microstructure and Mechanical Properties of Al–Mg–Zn Alloys

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Xu Qin,
  • Yang Kaifang,
  • Zheng Zeyuan,
  • Bi Xiaoqin,
  • Fu Ying

摘要

Abstract

To study the effect of a rare-earth element on the microstructure and mechanical properties of aluminum alloys, Al–Mg–Zn alloys with different Sc content were prepared, and microstructure, tensile strength, and microhardness of the alloys were studied. Results show that the alloys change from coarse strip-like grains to fine and uniform equiaxed grains with Sc content from 0 to 0.6 wt %, and grain size is reduced from 131.1 to 43.4 μm. Eutectic Al3Sc particles form alongside with the MgZn2 phase in the Al–2.5Mg–6Zn–0.45Sc and Al–2.5Mg–6Zn–0.6Sc alloys; primary Al3Sc phases form in an Al–2.5Mg–6Zn–0.6Sc. Microhardness of the alloys increases with increasing of Sc content and reaches maximum of 153.1 HV for the case of Al–2.5Mg–6Zn–0.6Sc, which is 16.2% higher than that of Al–2.5Mg–6Zn. Tensile strength increases with increasing of Sc and reaches maximum of 353.0 MPa for Al–2.5Mg–6Zn–0.6Sc, which is 9.5% higher than that of Al–2.5Mg–6Zn. Strength improvement of alloys results in grain refinement strengthening, secondary phase strengthening, and solid-solution strengthening by addition of Sc. Elongation of Al–2.5Mg–6Zn alloys first increases, then decreases with increasing of Sc content, then elongation of Al–2.5Mg–6Zn–0.3Sc reaches maximum of 13.6%. An increase in elongation of the alloys is the result of grain refinement effect, and a decrease of elongation is the result of the increase in the coarse Al3Sc phase formed in the alloys.