采用BaZrO3复合型壳定向凝固Ti-46Al-8 Nb合金.通过扫描显微镜、金相显微镜和XRD等手段分析了BaZrO3耐火材料与金属熔体之间的界面情况、熔体通过螺旋选晶器后的晶粒数目和片层变化、晶臂与枝晶干的夹角以及凝固后Ti-46Al-8Nb合金的组织形貌.结果表明,BaZrO3复合型壳与Ti-46Al-8Nb合金之间存在约为10 μm的扩散层;在抽拉速度7.7 mm/min、温度1550℃条件下,Ti-46Al-8Nb合金的初生相为α相以及β相,经过定向凝固后的微观组织为γ+α2片层、γ相以及B2相;在定向凝固过程中,螺旋选晶可以明显使晶粒数目减少,但是对片层间距的大小无影响.
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