Ti-Al-(Mo,V,Si,Fe) alloys and method of their manufacture

摘要

TiAl alloy includes 46 to 50 at% of Al, 5 at% or less of combination of Mo, V and Si, provided that Si content is 0.7 at% or less, and Mo content satisfies an equation of $\mathop{\mathrm{image}}$ \text{-0.3x + 17.5 at\%}$$ or less where x represents Al (at%), and the remainder being Ti and inevitable impurities. Mo may be replaced by Fe or combination of Mo and Fe. TiAl alloy is heated to a melt, poured into a mold, and cooled at a rate of 150 to 250 °C/min within a temperature range of 1500 to 1100°C. The resulting product can be used as cast. If desired, however, heat treatment such as HIP or homogenization may be performed within a temperature range of 1100 to 800°C. After the heat treatment, the melt is cooled at a rate of 100 °C/min or more until room temperature.