Abstract
The metal injection molding process was used to produce the Ti-4.3Fe-7.1Cr alloy compacts using the mixture of Ti and Fe-Cr alloy powders, and mixed elemental powder. The effect of mixed powder and sintering temperature on the densification behavior, mechanical properties and microstructures of the compacts were mainly investigated. The compacts sintered at below 1423K using a mixed elemental powder showed higher density and tensile strength as compared to the compacts using a mixture of Ti and Fe-Cr alloy powders. However, the tensile elongation at fracture of sintered compacts using both mixed powders was about 3%. Characteristic X-ray images and X-ray diffraction measurement confirms a particle dispersion, which is thought to be precipitation of α Ti phase, along the grain boundaries. Eventually, the tensile strength and relative density of the compacts sintered at 1423K using a mixed elemental powder attain 1160MPa and 96.9%, respectively.
