The Effect of Fe Addition on the Mechanical Properties of Ti–6Al–4V Alloys Produced by the Prealloyed Powder Method

抄録

The effect of Fe addition on the mechanical properties of Ti–6Al–4V alloys was investigated. Ti–6Al–4V prealloyed powders were prepared via a hydrogenation and dehydrogenation process using turning chips of Ti–6Al–4V alloys as the starting material. Mixed powders of Ti–6Al–4V powders and 3–4 mass% Fe powders were consolidated using a hot extrusion process and subsequently hot rolled. With increasing Fe content, the tensile strength and 0.2% proof stress of the Fe-containing alloys increased by 2%–30% compared to those of the Fe-free alloy in both as-hot-rolled and air-cooled specimens. The results also showed that the elongation in the 3% Fe-containing alloys was at least 10%, regardless of the treatment procedure. The balance between the generated martensitic phase and the β-phase ratio in (α+β)-dual-phase alloys appears to determine both the strength and elongation of the alloys. The Ti alloys obtained in this study have strong potential for application in automobiles and aircraft.