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Effect of Hybrid Reinforcement and Semisolid Production on Functional Properties of AZ31 Alloy Composites
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DOI：10.1007/s40962-026-02082-3.png)
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Abstract
En 中文
The magnesium alloy composites have unique characteristics, which are obtained by mixing a hybrid reinforcement through liquid-state processing. This technique is more economical and efficient compared to solid-state processing. However, agglomeration, uneven particle size, and porosity influence the composite properties and reduce the composite’s quality. This research adopts a semisolid stir casting production technique with argon atmosphere during the fabrication of the magnesium alloy (AZ31) composites. The effect of hybrid reinforcements such as 1 wt% boron nitride (50 nm) and 2-6 wt% silicon carbide (SiC) nanoparticles on microstructure, grain size, density–porosity, mechanical properties, and thermal conductivity of the AZ31 alloy and its composites is investigated. The microstructural studies show that the reinforcements are evenly distributed in the base matrix with reduced grain size. The X-ray diffraction analysis confirms the crystalline phases of the composite. However, the semisolid stir casting process and argon atmosphere resist air entrapment and oxide formation, resulting in reduced porosity. The AZ31 + 1 wt% BN + 6 wt% SiC shows an optimum microhardness of 86.5 HV, enhanced ultimate tensile strength of 267 MPa, increased fracture toughness of 28.1 MPam0.5, a higher thermal conductivity of 118 W/mK, and provides a better thermal stability compared to other composites. According to its findings, the AZ31 + 1 wt% BN + 6 wt% SiC hybrid nanocomposite meets the requirements of the lightweight structural application.
Keywords:
hybrid composite
microstructure
mechanical properties
semisolid stir casting production
thermal conductivity
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