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

TiB_2 reinforced Al-Cu matrix composites have been prepared by in-situ reaction synthesis process. The Electron Probe Microanalyses of the composites revealed that TiB_2 particles distribute along the grain boundaries, which interweave with CuAl_2 phases. TiB_2 particle is about 1μm in size, with nearly spherical form. Tensile tests at room temperature indicate that the strength of the composites increases with TiB_2 content increcsing, whereas the ductility is opposite. After T6 treatment, precipitated phase and reinforced phase are well distributed. The tensile strength of 6%TiB_2/ZL202 composites is 325MPa.