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A pre-alloyed powder metallurgy method has been investigated in order to produce high-strength titanium alloy at a lower cost than by currently executed blended elemental powder method. Ti-6Al-4V alloy bars containing 3.5 %Fe and 4 %Cu of φ 22 mm were produced using Ti-6Al-4V alloy powder as a starting material by hot isostatistic pressing (HIP) followed by forging and hot-rolling. The material densified to almost 100 % density through HIP process. Microstructure after hot rolling at the temperature of (α + β) region showed fine equi-axial grains. Tensile characteristics of Fe and Cu containing alloys were strongly influenced by heat treatment condition. Just after hot rolling or heat treatment, especially air-cooling, the addition of Fe and Cu resulted in high strength but poor elongation. Water-cooled material showed enough elongation but a little bit poorer strength. These tensile characteristics seem to be explained by the β phase ratio in the alloy. This result shows that tensile properties of Ti-6Al-4V alloys containing Fe and Cu can be controlled by heat treatment condition, and possess high potential in the application for airplane and automobile.

Production of High Strength Titanium Alloy through HIP