研究Al-15Si-2.6Cu-0.57Mg合金在烧结过程中液相量随烧结温度和烧结时间的变化,以及液相量对合金组织与性能的影响.结果表明,冷压坯以10℃/min升温至560℃烧结1h为最优实验参数.冷压坯以10℃/min升温至560℃时含有体积分数为13％的液相,此温度下保温40 min后液相量趋于稳定,随着烧结时间继续增长,液相更加均匀地分布在合金中,同时560℃下烧结1h后合金致密且抗拉强度最好.冷压坯升温过程中约在500℃开始出现θ相回溶,Q相在510℃开始回溶,至535℃完全消失,这些相的回溶使元素溶解度增加,降低固相向液相转变的起始温度,从而促进液相的转变和液相量的增加.
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