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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40min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。
The effects of liquid phase amount, sintering temperature and sintering time on the microstructure and properties of Al-15Si-2.6Cu-0.57Mg alloy during sintering were investigated. The results show that the cold compaction at 10 ℃ / min to 560 ℃ sintering 1h as the best experimental parameters. The cold compacts with the temperature of 10 ℃ / min heated to 560 ℃ when the volume fraction of 13% of the liquid phase, the temperature at 40min after the liquid phase tends to be stable, with the sintering time continues to grow, the liquid phase more evenly distributed in In the alloy, the alloy is dense and the tensile strength is the best when sintered at 560 ℃ for 1h. During the process of cold compaction, θ-phase remelting began to occur at about 500 ° C. The Q-phase began to dissolve at 510 ° C and disappeared completely to 535 ° C. The dissolution of these phases increased the elemental solubility and decreased the phase transition from solid phase to liquid phase The starting temperature, thereby promoting the liquid phase transition and the liquid phase increase.