Effect of forging temperature on microstructure and mechanical properties of in situ (TiB+TiC)/Ti composites

Abstract

In this paper, 5vol% (TiB+TiC)/Ti-1100(Ti-6Al-2.75Sn-4Zr-0.4Mo-0.45Si) composite were fabricated using in situ technologies between Ti and 840 powders. Phase identification was carried out by X-ray diffraction, β transus temperature of the composite was measured by metallographic techniques. The composite after ingot breakdown was forged in various temperature ranges. Microstructure of the composite after forging at various temperatures was studied by optical microscopy (OM). Mechanical properties of the composite after forging at various temperatures were evaluated by tensile tests at 873 K. It was found that the β transus temperature of the composites was around 100 K higher than that of monolithic Ti-1100 alloy. Different microstructures were obtained after forging at different temperatures. The composite with different microstructures offered different mechanical properties, which was shown in the tensile tests. © 2006 The Japan Institute of Metals.