(TiB_2+SiC_p)/ZL101复合材料组份优化及其力学性能

为了确定(TiB2+SiCp)/ZL101复合材料的最佳成分,通过采用正交实验分析方法,研究复合材料的制备工艺,测试了复合材料的力学性能,并对该材料进行了显微金相分析和透射电子显微分析.结果表明,复合材料经过热处理后,抗拉强度、布氏硬度分别较基体合金ZL101提高了21.4%、49.3%;热膨胀系数较基体合金降低了14.1%;热处理后,复合材料中的共晶硅以粒状形态均匀分布于基体中;复合材料中增强相TiB2为粒状,SiC粒子为多边形尖角块状,两相较均匀分布于基体晶粒内部,且与-αAl的界面结合良好.

Components Optimization and Mechanical Properties of (TiB2+ SiCp)/ZL101 Composites

In order to determine the best ingredients of （TiB2 ＋SiCp）/ZL101 composite materials, the composite preparation process is studied using orthogonal experiment method, the mechanical properties of composite materials are tested, and microstructure of the material is analized by metallographic and transmission electron microscopy. The results show that the tensile strength and HV hardness of （TiB2 ＋SiCp）/ZL101 are raised by 21.4% and 49. 3% respectively. Coefficient of thermal expansion reduced 14. 1% than the matrix alloy. After the heat treatment, eutectic silicon in granular form is uniformly distributed in the matrix. The grainy TiBe composites reinforcement and SiC of polygon shape with sharp corners are uniformly distributed in the matrix and are combined with α-Al well with perfect interface.