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<p>This study looks at how varying rates of cooling and overheating affect the microstructure, mechanical properties, and corrosion resistance of a directionally solidified Al-17Si alloy. It examined how the primary silicon particles (PSPs) size, shape, and distribution changed. The investigation found that increasing cooling rates and overheating led to PSPs that were finer and more distributed more evenly. Higher cooling rates (15–20&#xa0;°C/min) resulted in PSPs throughout the sample, whereas lower rates (5–10&#xa0;°C/min) caused PSPs to gather in the uppermost layers. Mechanical tests showed that the hardness increased with cooling rate, peaking at 65.7 HB in the uppermost layers at a cooling rate of 20&#xa0;°C/min. The study also revealed that higher cooling rates increased wear resistance while lowering friction coefficients. Corrosion tests indicated that the alloy’s corrosion resistance improved with faster cooling rates. The study demonstrates that precise control of overheating and cooling rates can effectively optimize the microstructure and properties of the Al-17Si alloy for specific applications.</p>

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Optimization of Primary Silicon Morphology in Directionally Solidified Al-17Si Alloy Through Controlled Cooling Rates and Overheating: Implications for Wear and Corrosion Resistance

  • 期刊论文

  • 发表日期：

    2025年6月29日

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  • Selçuk Şirin

摘要

This study looks at how varying rates of cooling and overheating affect the microstructure, mechanical properties, and corrosion resistance of a directionally solidified Al-17Si alloy. It examined how the primary silicon particles (PSPs) size, shape, and distribution changed. The investigation found that increasing cooling rates and overheating led to PSPs that were finer and more distributed more evenly. Higher cooling rates (15–20 °C/min) resulted in PSPs throughout the sample, whereas lower rates (5–10 °C/min) caused PSPs to gather in the uppermost layers. Mechanical tests showed that the hardness increased with cooling rate, peaking at 65.7 HB in the uppermost layers at a cooling rate of 20 °C/min. The study also revealed that higher cooling rates increased wear resistance while lowering friction coefficients. Corrosion tests indicated that the alloy’s corrosion resistance improved with faster cooling rates. The study demonstrates that precise control of overheating and cooling rates can effectively optimize the microstructure and properties of the Al-17Si alloy for specific applications.