高频磁场下原位合成Al3(Ti0.5Zr0.5)p/6005A复合材料的显微组织与性能

摘要

Al3 (Ti0.5 Zr0.5 )p/6005A composites were in-situ synthesized under high-frequency magnetic field by direct melt reaction using K2TiF6, K2ZrF6 and Na3A1F6 as reactants. By means of scanning electron microscopy, Xray diffraction and tensile testing machine, the microstructure and properties of the composites were investigated.The results show that the in-situ synthesized particles under magnetic field were fine Al3 (Ti0. 5 Zr0. 5 )p particles,whose average size was 1-3μm and dispersively distributed in Al substrate. At magnetic frequency of 2 MHz, the yield strength, tensile strength of the composites were 279. 4 and 305. 8 MPa, which increased by 7. 1％ and 8.7％compared with that of the substrate. And the elongation was 9. 5％, which decreased by 10. 1％. The fracture characteristics of the composites transformed from ductile fracture of the substrate to mixing fracture.%以K2TiF6、K2ZrF6与Na3AlF6为反应物,在高频磁场下,采用熔体反应法原位合成了A13(Ti(0.5)Zr(0.5))p/6005A复合材料;通过扫描电镜、X射线衍射仪、拉伸试验机等对复合材料的组织与性能进行了研究.结果表明:磁场下原位生成了细小的Al3(Ti(0.5)Zr(0.5))颗粒,平均尺寸为1-3μm,且弥散分布于基体中;在磁场频率为2MHz时复合材料的屈服强度、抗拉强度分别为279.4,305.8MPa,较基体的提高了7.1%和8.7%,伸长率为9.5%,较基体的下降了10.1%;复合材料的断裂特征由基体的韧性断裂转变为混合型断裂.