In-situ straining observation on crack initiation and growth in an intermetallic Al₆₇Mn₈Ti₂₅alloy

来源期刊：中国有色金属学报(英文版)1999年第4期

论文作者：文九巴 戎咏华 陈世朴 胡赓祥

文章页码：810 - 813

Key words：Al₃Ti alloys; in-situ observation; crack propagation

Abstract: 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.