| 摘要 |
PURPOSE:To improve the oxidation resistance of a Ti-Al base alloy at a high temp. by subjecting the ingot of a Ti-Al base alloy having specified Al content to hot working at a specified temp. and draft and refining its crystalline grains. CONSTITUTION:An intermetallic compound Ti-Al base alloy contg., by weight, 31 to 44% Al, or furthermore contg. total 0.1 to 7.5% of one or two kinds of Mn and V and the balance Ti with inevitable impurities is manufactured. The ingot of this alloy is extruded at 900 to 1450 deg.C extruding temp. and 1.3 to 15 extrusion ratio. Moreover, this ingot is rolled at 900 to 1450 deg.C rolling temp. and 10 to 80% reduction ratio. By the hot working under this conditions, the alloy is recrystallized into 0.05 to 10mum crystalline grain size. If required, this alloy is furthermore incorporated with one or >=two kinds among 0.1 to 7.5% Mo, 0.2 to 1.0% Y and 0.1 to 1.2% Si. This alloy has excellent oxidation resistance as well as high specific strength characteristics of the alloy and is therefore suitable to the use for aircraft members or the like. |
