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以AlTi5B中间合金和磷盐为复合变质剂,通过金相分析和差热分析等方法研究了变质处理和熔化-凝固热循环对Al-17%Si合金显微组织、储热性能的影响.结果表明;经过磷盐和AlTi5B复合变质处理后的合金,原粗大块状、条状的初晶硅明显减小且棱角钝化,较大针状的共晶硅变为颗粒状;在480～620℃随循环次数增加初晶硅颗粒由小变大,潜热值下降.
AlTi5B master alloy and phosphorus salt were used as the compound modifier to study the effects of modification and melting-solidification heat cycles on the microstructure and heat storage performance of Al-17% Si alloy by means of metallographic analysis and differential thermal analysis. Results The results show that the primary coarse silicon and the strip primary silicon are obviously reduced and the corners are passivated after the phosphating and AlTi5B compound metamorphism treatment. The larger needle-shaped eutectic silicon becomes granular; in 480-620 ℃ with the increase in the number of primary silicon particles from small to large, the latent heat value decreased.