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Abstract <p>This study investigates the effect of P addition on the morphology, size, and radial distribution of <i>in situ</i> formed Mg<sub>2</sub>Si particles in centrifugally cast Al–15 wt% Mg<sub>2</sub>Si cylindrical composites. Microstructural analyses were performed on three cast cylinders with different P contents (0, 0.4, and 0.7 wt%) along the radial direction. The results reveal that P significantly refines the primary Mg<sub>2</sub>Si particles <i>via</i> heterogeneous nucleation on <i>in situ</i> formed AlP compounds, reducing their average size in the inner radial layers from ~ 50&#xa0;μm (P-free) to ~ 27&#xa0;μm and ~ 23&#xa0;μm for the 0.4% and 0.7% P composites, respectively. According to Stokes’ law, this refinement moderates inward segregation, resulting in a more gradual functionally graded radial distribution compared to the abrupt segregation profile in the P-free composites. Furthermore, P modifies the morphology of both the primary and eutectic Mg<sub>2</sub>Si particles, transforming them from hopper/lamellar shapes into truncated octahedral (primary) and fine lamellar (eutectic) forms.</p> Graphical abstract <p></p>

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Modification of morphology/functionally graded distribution of Mg2Si particles by addition of phosphorus in centrifugal casting of Al–15 wt% Mg2Si composite

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Ebrahim Aghazadeh,
  • Ahad Samadi

摘要

Abstract

This study investigates the effect of P addition on the morphology, size, and radial distribution of in situ formed Mg2Si particles in centrifugally cast Al–15 wt% Mg2Si cylindrical composites. Microstructural analyses were performed on three cast cylinders with different P contents (0, 0.4, and 0.7 wt%) along the radial direction. The results reveal that P significantly refines the primary Mg2Si particles via heterogeneous nucleation on in situ formed AlP compounds, reducing their average size in the inner radial layers from ~ 50 μm (P-free) to ~ 27 μm and ~ 23 μm for the 0.4% and 0.7% P composites, respectively. According to Stokes’ law, this refinement moderates inward segregation, resulting in a more gradual functionally graded radial distribution compared to the abrupt segregation profile in the P-free composites. Furthermore, P modifies the morphology of both the primary and eutectic Mg2Si particles, transforming them from hopper/lamellar shapes into truncated octahedral (primary) and fine lamellar (eutectic) forms.

Graphical abstract