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Abstract <p>The effects of Mg additions on the microstructure and mechanical properties of Al–<i>x</i>Mg–2.2Si alloys are investigated in this work. The microstructure reveals that the volume fraction of Al–Mg<sub>2</sub>Si eutectic phase increases and then decreases with the increase of Mg addition. The optimized concentration of Mg addition is 7 wt %, with the yield strength (YS) of 215 MPa and the ultimate tensile strength (UTS) of 243&#xa0;MPa. However, the mechanical properties of alloy decreases when Mg is elevated to 8 wt.%, due to the reduction in the volume fraction of Al–Mg<sub>2</sub>Si eutectic phase in the microstructure. The improvement of mechanical properties is attributed to the synergistic strengthening effect of Mg atoms and Mg<sub>2</sub>Si precipitations. The mechanism of fracture turns from brittle fracture to mixed mode of brittle and intergranular fracture with the amount of Mg addition increases from 6 to 8 wt %.</p>

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Effect of High Mg Addition on Microstructure and Mechanical Properties of Al–xMg–2.2Si Alloys

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Xu Guo,
  • Qing bo Zhou,
  • Ying jun Zhang,
  • Guo rong Zhou,
  • Jin feng Leng

摘要

Abstract

The effects of Mg additions on the microstructure and mechanical properties of Al–xMg–2.2Si alloys are investigated in this work. The microstructure reveals that the volume fraction of Al–Mg2Si eutectic phase increases and then decreases with the increase of Mg addition. The optimized concentration of Mg addition is 7 wt %, with the yield strength (YS) of 215 MPa and the ultimate tensile strength (UTS) of 243 MPa. However, the mechanical properties of alloy decreases when Mg is elevated to 8 wt.%, due to the reduction in the volume fraction of Al–Mg2Si eutectic phase in the microstructure. The improvement of mechanical properties is attributed to the synergistic strengthening effect of Mg atoms and Mg2Si precipitations. The mechanism of fracture turns from brittle fracture to mixed mode of brittle and intergranular fracture with the amount of Mg addition increases from 6 to 8 wt %.