稀土La对Al2O3/Cu复合材料组织与性能的影响

利用机械合金化法结合放电等离子烧结制备Al2O3/Cu铜基复合材料,采用XRD、SEM、硬度、抗拉强度和电导率等测试研究La含量对Al2O3/Cu复合粉末和烧结材料组织及性能的影响。结果表明:添加0.05%的稀土La有利于机械合金化过程中Cu晶粒的细化和Al2O3颗粒的弥散分布,从而提高烧结材料的显微硬度和抗拉强度。烧结材料的导电率随着La含量的增加先升后降,当La的质量分数为0.10%时,Al2O3/Cu复合材料的导电率提高11.3%IACS。

Effect of Rare Earth La on Microstructures and Properties of Al2O3/Cu Composites

Dispersion strengthened copper-base composites Al2O3/Cu were fabricated by mechanical alloying and spark-plasma sintering. The effect of the content of rare earth La on the microstructure and properties of Al2O3/Cu composite powder and the sintered materials were studied. The results show that 0.05%La addition to the Al2O3/Cu composite powder accelerates grain refinement and alumina particle dispersion in the mechanical alloying process, so as to improve the microhardness and tensile strength of the composites. The conductivity of the composite increases and then decreases with the increase of the content of La, and the conductivity increases by 11.3%IACS when the La content is 0.10%.