用原位自生法制备了TiAl-B合金,并用XRD、SEM对材料的相组成、微观组织和初生TiB2晶体的界面结构特征进行了研究.结果表明:该合金主要由TiAl和TiB2两相组成;初生TiB2呈六面棱柱状,在其(0001)面存在清晰的生长台阶、凸台状或柱棒状分枝,它们的各晶面取向与母体的取向一致.分析表明,在TiAl-B合金凝固过程中初生TiB2晶体的固-液界面是不稳定的,使固-液界面由一完整光滑的界面逐渐演变为由多个相互独立的次级界面构成的复杂界面,次级界面亦为小面结构、具有相同的晶面取向关系.
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