In-situ straining observation on crack initiation and growth in an intermetallic Al_(67)Mn_8Ti_(25)alloy  

作　　者：文九巴 戎咏华 陈世朴 胡赓祥 

出　　处：《中国有色金属学会会刊：英文版》1999年第4期810-813,共4页Transactions of Nonferrous Metals Society of China

摘　　要：In-situ straining SEM observations of an intermetallic Al67Mn8Ti25 alloy were carried out on sheet specimens containing notch with root radius about 100μm. The results show that the crack initiation occurs at notch root along grain boundary, and it grows very rapidly in transgranular manner. During the crack growing, some crack branches and segments are formed. Occasionally when the crack propagates in the direction close to grain boundary, it grows intergranularly along a part of boundary. The observed crack propagation process indicates that the alloy is very brittle at ambient temperatures.In-situ straining SEM observations of an intermetallic Al_67Mn_8Ti_25 alloy were carried out on sheet specimens containing notch with root radius about 100μm. The results show that the crack initiation occurs at notch root along grain boundary, and it grows very rapidly in transgranular manner. During the crack growing, some crack branches and segments are formed. Occasionally when the crack propagates in the direction close to grain boundary, it grows intergranularly along a part of boundary. The observed crack propagation process indicates that the alloy is very brittle at ambient temperatures.

关 键 词：Al₃Ti alloys IN-SITU OBSERVATION crack propagation 

分 类 号：TG14[一般工业技术—材料科学与工程]