EFFECT OF FORGING ON MICROSTRUCTURAL CHARACTERISTIC AND TENSILE PROPERTIES OF IN SITU (TiB+TiC)/Ti COMPOSITE

摘要

In this work, 2.5vol. % (TiB+TiC)/Ti composite was prepared by in situ casting route then 1-D forging. The microstructure and tensile properties were presented and discussed. The results indicate that the as cast microstructure can be significantly modified by 1-D forging. After forging, TiB and TiC segregated at the prior β grain boundaries within the as-cast composite tend to fracture and align perpendicular to forging direction. Reduction in aspect ratio of reinforcements and a lath is also observed. 1-D forging can enhance the strength and elongation of as cast composite significantly. However, the increment in strength is quite limited as strain temperature increases to 700 °C. Additionally, Room temperature and high temperature fracture mechanisms are also discussed as well.