通过TiAl基合金两种组织的四点弯曲断裂实验,研究了TiAl基合金的缺口断裂机制.实验结果表明:缺口试样的断裂过程为几个沿层裂纹直接起裂于缺口根部,并沿着缺口根部的层间扩展;当遇到位向不利的晶粒时,裂纹便停止在这一晶粒前方,随着外加载荷的增加,即应力的增加,裂纹彼此连接并通过穿层裂纹而扩展;裂纹尖端超钝化、裂纹分叉、沿着层间偏转,形成显微裂纹区,裂纹停在障碍晶粒前的边界上为这种材料的韧化机制;裂纹扩展的驱动力是拉伸应力,缺口的存在增加了缺口前沿或者裂纹尖端的应力.
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