选取Bi、Sn、Cu、Zn、Ni、Si等元素分别加入Mg基体中,熔炼得到7种Mg基二元和三元高温相变储热共晶合金.运用固溶体准化学模型及其2种简化形式对Mg基共晶合金的熔化相变焓进行计算,并通过DSC实测值对预测值进行验证.结果表明,7种Mg基共晶合金的实测熔点在450~600 ℃范围内,实测熔化相变焓200 kJ/kg左右.由简化模型得到的预测值同实测值匹配度较高,能够用于Mg基多元共晶合金熔化相变焓的预测.此外,提高熔化熵值高的元素比例并增加组元数,可以提高共晶合金体系的熔化相变焓.
By adding elements of Bi, Sn, Cu, Zn, Ni and Si into Mg matrix, respectively, seven kinds of binary and ternary Mg-based eutectic alloys were prepared for high temperature latent heat thermal storage.The solution model and its two reduced forms were used to calculate the latent heat of melting and the calculated values were verified by comparing the DSC values.The results show that the melting points of Mg-based eutectic alloys fall into the range from 450 to 600 ℃ and the latent heat of melting is approximately 200 kJ/kg.The calculated values from model agree well with the measured results.It is believed that model is convenient and effective for estimating the latent heat of melting of Mg-based multi-component eutectic alloys.Besides, the latent heat can be greatly improved by increasing the proportion of element with high melting entropy and increasing the component of eutectic alloy.
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