利用金属型真空吸铸技术获得了TiAl基合金薄板件,并研究了该铸件的铸态组织以及合金元素对其组织的影响.实验结果表明:由于金属型的强制冷却作用,金属型真空吸铸的Ti.47A1合金薄板铸件铸态组织细小,平均晶粒尺寸在60μm左右；W元素的添加有利于B2相的形成,从而细化组织,其机理是B2相阻碍了α晶粒长大；Si元素添加生成的Ti5Si3相,主要分布在晶界处,形成的Ti5Si3第二相质点会阻碍TiAl基合金凝固过程中组织的长大,有利于细化TiAl基合金组织.
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