TiB_2/Al-Cu复合材料微观组织和力学性能研究

Study on the Microstructure and Mechanical Properties of TiB_2/Al-Cu Composites

采用原位反应合成法制备了TiB2/ZL202复合材料。对复合材料的微观组织观察表明,增强相TiB2颗粒主要分布于晶界上,与CuAl2相交织在一起,尺寸在1μm左右,呈现圆球形。铸态下复合材料室温抗拉强度随着TiB2含量的增多而明显提高,伸长率则有降低的趋势。T6处理后,复合材料中析出相与增强相分布较均匀,6%TiB2/ZL202抗拉强度达到325MPa。

TiB2 reinforced Al-Cu matrix composites have been prepared by in-situ reaction synthesis process. The Electron Probe Microanalyses of the composites revealed that TiB2 particles distribute along the grain boundaries, which interweave with CuAl2 phases. TiB2 particle is about 1μm in size, with nearly spherical form. Tensile tests at room temperature indicate that the strength of the composites increases with TiB2 content increasing, whereas the ductility is opposite. After T6 treatment, precipitated phase and reinforced phase are well distributed. The tensile strength of 6%TiB2/ZL202 composites is 325MPa.