Abstract
Abstract. Ti-Mo based alloys have been used as biocompatible materials. Recently the positive use of inexpensive alloying elements becomes important to develop low cost Ti alloys. The purpose of the present study was to reveal the effect of Fe in Ti-Mo alloy addition on the microstructure formation and mechanical properties. Ti-(2.0, 3.0)at%Mo-(0.0~2.0)at%Fe alloys were arc-melted. The alloy buttons were hot-rolled into about 2.0 mm thick sheets at 10731223 K. Specimens -solid-solution-treated at 1273 K in β phase field were quenched into iced brine. X -ray diffractometry was used to identify phases in the specimens. Microstructures were examined by both optical and transmission electron microscopies. Hardness Young's modulusand of the alloys were evaluated. Addition of Fe in Ti -Mo alloys promote d the formation of athermal omega and increase d in hardness. As-quenched Ti-3at%Mo alloy exhibited mixture of α' and α martensites. The Young's modulus of it was 76 GPa. Ti-2at%Mo-1at%Fe alloy, replacement of 1at%Mo (expensive) by 1at%Fe (inexpensive) from Ti-3at%Mo, also exhibited mixture of α' and α martensites with the Young's modulus of 85 GPa. Hardness of Ti -2at%Mo-1at%Fe alloy, 329Hv, is greater than that of Ti -3at%Mo alloy, 257 Hv. -2at%MoTi-1at%Fe is thought to be a candidate material for a low cost bone replacement Ti alloy with low Young's modulus.
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