固溶处理对Al2O3/7075复合材料的组织及力学性能的影响

Effects of Solution Treatment on Microstructure and Mechanical Properties of Al2O3/7075 Composites

采用球磨预制块和高能超声等方法制备了Al2O3含量为2.0%的7075复合材料,通过SEM、EDS、拉伸及硬度测试等方法,研究了固溶处理对Al2O3/7075复合材料显微组织和力学性能的影响。结果表明,随着固溶温度和时间的增加,Al2O3/7075复合材料中第二相Mg(Zn,Cu,Al)2逐渐溶入基体中。与Al2O3/7075复合材料相比,经460℃×5h固溶处理的Al2O3/7075复合材料的硬度、抗拉强度和伸长率分别提高了37.2%、19.0%和46.2%。

Al2O3/7075 composites were prepared by ball milling precast block and high-energy ultrasound method,and effects of solid solution treatment on the microstructure and mechanical properties of Al2O3/7075 composites were investigated by SEM,EDS,hardness and tensile testing.The results reveal that Mg(Zn,Cu,Al)2 in the second phase of Al2O3/7075 composites is dissolved gradually into the matrix with the increase of solution temperature and time.Compared with those of Al2O3/7075 composites,the microhardness,tensile strength and elongation of Al2O3/7075 composite with solution treatment at 460℃ for 5 h are increased by 37.2%,19.0%and 46.2%,respectively.