TiAl金属间化合物板材以其低密度、高强度、高刚度和优异的抗蠕变和抗氧化性能等优点,在航空航天领域,成为替代700～900℃使用的高温合金板材的重要高温结构材料.目前,TiAl金属间化合物板材的制备方法主要为铸锭冶金技术(IM)和粉末冶金技术(PM).本文采用铸锭冶金技术(近等温包套轧制技术)成功制备了尺寸为700 mm×200 mm×2 mm的TiAl合金板材.TiAl合金板材外观完整,无宏观及微观裂纹等缺陷.TiAl合金板材显微组织为近双态组织,由γ相、B2相和少量的α2相、YAl2相组成.其中B2相含量达到24％,呈块状或片状分布在γ相基体中,B2相高温下转变为无序β相可显著改善合金的高温变形能力.TiAl合金板材显微组织中存在较多的块状γ相和B2相,这主要是由于高温轧制过程中的动态再结晶和静态再结晶引起的.
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