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<p>The over-modified primary Mg<sub>2</sub>Si is completely eliminated in the Al-14Mg<sub>2</sub>Si-0.2Sr alloy by the sub-rapid solidification method, and only eutectic Mg<sub>2</sub>Si with an irregular morphology is formed. Under high cooling rate condition, the adsorption of Sr atoms enhances the inhibitory effect on the nucleation of primary Mg<sub>2</sub>Si, thereby redirecting the majority of the Mg and Si atoms to form eutectic Mg<sub>2</sub>Si. Mg/Si localized segregation within the melt causes subsequent difference in eutectic Mg<sub>2</sub>Si growth rate, leading to an irregular eutectic morphology. The particle size of Mg<sub>2</sub>Si is a major factor influencing the strength of the Al-14Mg<sub>2</sub>Si alloy, primarily through its effect on the fracture stress (σ<sub>c</sub>). The Al-14Mg<sub>2</sub>Si-0.2Sr alloy prepared by the SRS method exhibits a high UTS of ~261 MPa owing to the presence of the refined irregular eutectic Mg<sub>2</sub>Si. The morphology of Mg<sub>2</sub>Si influences the dislocation slip and dislocation tangles in the Al-14Mg<sub>2</sub>Si alloy, thereby altering the ductility of the alloy. This work employs an effective strategy to eliminate primary Mg<sub>2</sub>Si over-modification, a key development in fabricating Al-Mg<sub>2</sub>Si alloys with superior mechanical properties.</p>

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Eliminating of Over-Modified Primary Mg2Si in Al-14Mg2Si-0.2Sr Alloy via High Cooling Rate

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Hong-Chen Yu,
  • Rui Guo,
  • Xiu Ji,
  • Gui-Long Wang,
  • Yan Huang,
  • Dan-Yang Wei,
  • Yue-Jiao Du

摘要

The over-modified primary Mg2Si is completely eliminated in the Al-14Mg2Si-0.2Sr alloy by the sub-rapid solidification method, and only eutectic Mg2Si with an irregular morphology is formed. Under high cooling rate condition, the adsorption of Sr atoms enhances the inhibitory effect on the nucleation of primary Mg2Si, thereby redirecting the majority of the Mg and Si atoms to form eutectic Mg2Si. Mg/Si localized segregation within the melt causes subsequent difference in eutectic Mg2Si growth rate, leading to an irregular eutectic morphology. The particle size of Mg2Si is a major factor influencing the strength of the Al-14Mg2Si alloy, primarily through its effect on the fracture stress (σc). The Al-14Mg2Si-0.2Sr alloy prepared by the SRS method exhibits a high UTS of ~261 MPa owing to the presence of the refined irregular eutectic Mg2Si. The morphology of Mg2Si influences the dislocation slip and dislocation tangles in the Al-14Mg2Si alloy, thereby altering the ductility of the alloy. This work employs an effective strategy to eliminate primary Mg2Si over-modification, a key development in fabricating Al-Mg2Si alloys with superior mechanical properties.