通过SEM中静载动态拉伸,原位观察和研究了搅拌铸造法制备的YAl2P/Mg-Li-Al基复合材料裂纹的萌生及扩展机制.结果表明,微裂纹萌生位置主要为复合材料的铸造缺陷处、复合材料的基体中以及颗粒/基体界面处,并以在复合材料基体中萌生为主.微裂纹的扩展主要在基体和YAl2颗粒/基体界面处进行.主裂纹的长大方向具有选择性,裂纹主要沿颗粒贫化区与颗粒富集区的交界处开裂,主裂纹扩展到一定程度后,试样全面失稳而迅速断裂.基体的断裂失效在YAl2P/Mg-Li-Al复合材料拉伸断裂过程中起很大作用.
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