Consideration of the influence of contamination from oxide crucibles on TiAl cast material, and the possibility of achieving low-purity TiAl precision cast turbine wheels
(TiAl鋳造材に及ぼす酸化物ルツボによる汚染の影響ならびに低純度TiAl精密鋳造タービンホイールの実現可能性検証)