抄録
The effect of Ta content on Young's modulus and microstructures of binary Ti-Ta alloys with different mass percents of Ta from 10% to 80% was investigated in order to find a Ta content that gives the suitable Young's modulus for biomedical applications. The experimental results show that both the crystal structure and Ta content have the strong effect on Young's modulus of binary Ti-Ta alloys. The α'' Ti-Ta alloy with mass percents of 30% Ta and metastable β Ti-Ta alloy with 70 % Ta have the nearly same lowest Young's modulus under the given solution treatment. The microstructures of Ti-Ta quenched alloys are very sensitive to Ta content. The quenched alloys exhibit the plate-like HCP martensite (α') structure at a Ta content between 0 and 20 mass%, the acicular orthorhombic martensite (α'') structure at a Ta content between 30 and 50 mass%, metastable β + α'' structure at a Ta content of 60 mass%, and only metastable β structure at a Ta content more than 60 mass%.
