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以Al-20Si合金为基体,加入质量分数为2%的还原铁粉原位反应得到Al-Si-Fe/Al-20Si复合材料,研究了稀土Y含量为0.01%、0.1%、0.2%、0.3%对复合材料铸态和热处理后组织及性能的影响。结果表明:复合材料中的增强相为Al-Si-Fe金属间化合物,当Y含量为0.1%时对复合材料的变质效果最佳,富铁相成由细针状转变为鱼骨状且分布均匀,抗拉强度和伸长率与变质后基体相比分别提高了19.4%和20%,再经过550℃固溶处理和120℃时效处理后富铁相转变为短棒状或块状,与铸态相比抗拉强度和伸长率分别提高了8.4%和30%。
The Al-Si-Fe / Al-20Si composites were obtained by in-situ reaction of Al-20Si alloy with reduced iron powder with the mass fraction of 2%. The content of rare earth Y was 0.01%, 0.1%, 0.2% Effect of% on the microstructure and properties of composites after as - cast and heat treatment. The results show that the reinforcing phase in the composites is Al-Si-Fe intermetallic compound. When the content of Y is 0.1%, the modification effect of the composites is the best, and the phase of Fe-rich phase transforms from fine needle to fishbone Uniformity, tensile strength and elongation increased by 19.4% and 20% respectively compared with the matrix after metamorphism. After the solution treatment at 550 ℃ and the aging treatment at 120 ℃, the iron-rich phase turned into a short bar or block, Compared to the tensile strength and elongation increased by 8.4% and 30%.