January 1, 2025Acta Physica SinicaOpen Access

Effect of trace Mg and heat treatment on microstructure and properties of Al-7Si alloy

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Heat treatment improves thermal conductivity and mechanical properties in Al-7Si using minor magnesium, indicating enhanced performance potential.

Heat treatment increased thermal conductivity of Al-7Si-0.4Mg alloy to 189 W/(m·K), improving performance in various applications.
Microhardness of Al-7Si-0.4Mg alloy reached 73.5 HV after treatment, representing a significant improvement of 62.6%.
Three-step heat treatment effectively spheroidized eutectic silicon and precipitated nanoscale strengthening phases, enhancing alloy properties.
Modifications achieved in this study could guide future designs for Al-Si alloys focused on high strength and conductivity.

Wang et al. (2025) studied this question.

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Heat treatment improves thermal conductivity and mechanical properties in Al-7Si using minor magnesium, indicating enhanced performance potential.