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<p>Hybrid bimodal Mg alloy-based composites have been synthesized using a solidification process by adding SiC<sub>p</sub> and TiO<sub>2</sub> as reinforcing particles at 4 wt% each, with sizes of 20–40&#xa0;μm and 0.1–1&#xa0;μm, respectively. The microstructure shows a homogeneous distribution of particles containing dendrites consisting of α-Mg phase and eutectic β-Mg<sub>17</sub>Al<sub>12</sub> phase. The study explored the dry sliding wear behavior in the as-cast condition and after T6 heat treatment under loads of 5–20 N at a sliding speed of 0.175&#xa0;m/s. The wear rate increases linearly with the applied loads and maximum in the range of 0.0534–0.099 mm<sup>3</sup>/m for the as-cast samples due to <i>β</i>-eutectic phase precipitation. Better wear resistance was observed in solution-treated condition due to the formation of an oxide layer/mechanically mixed layer. The microstructures, morphology and SEM analysis of worn surface were found to be correlated with wear and friction results.</p>

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Effect of Heat Treatment on Microstructure and Wear Behavior of Bimodal Hybrid Mg Alloy-Based Composites

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Rahul Sharma,
  • Jayashree Baral

摘要

Hybrid bimodal Mg alloy-based composites have been synthesized using a solidification process by adding SiCp and TiO2 as reinforcing particles at 4 wt% each, with sizes of 20–40 μm and 0.1–1 μm, respectively. The microstructure shows a homogeneous distribution of particles containing dendrites consisting of α-Mg phase and eutectic β-Mg17Al12 phase. The study explored the dry sliding wear behavior in the as-cast condition and after T6 heat treatment under loads of 5–20 N at a sliding speed of 0.175 m/s. The wear rate increases linearly with the applied loads and maximum in the range of 0.0534–0.099 mm3/m for the as-cast samples due to β-eutectic phase precipitation. Better wear resistance was observed in solution-treated condition due to the formation of an oxide layer/mechanically mixed layer. The microstructures, morphology and SEM analysis of worn surface were found to be correlated with wear and friction results.