Al₆₇Mn₈Ti₂₅合金的解理裂纹

来源期刊：中国有色金属学报1999年第3期

论文作者：文九巴 戎咏华 陈世朴 胡赓祥

文章页码：488 - 492

关键词：L1₂结构Al₃Ti；解理断裂；电子背散射

Key words：L1₂-structured Al₃Ti；cleavage fracture；Electron Backscatter Diffraction(EBD)

摘    要：利用Stroh位错塞积模型解释了L1₂结构Al₆₇Mn₈Ti₂₅合金室温解理裂纹的萌生。计算表明，位错塞积优先在与滑移面成35.3°方向诱发微裂纹，导致解理断裂。经室温弯曲断口解理面取向的电子背散射衍射(EBSD)测试结果验证表明，L1₂结构Al₆₇Mn₈Ti₂₅合金室温解理断裂裂纹优先在｛110｝晶面萌生。

Abstract: Stroh's dislocation piling-up model can be successfully applied to explain the nucleation mechanism of deformation-induced cleavage microcracks in L1₂-structured Al₆₇Mn₈Ti₂₅ intermetallic compound at bending deformation. Calculations show that a pile-up of dislocations induces preferentially a cleavage microcrack at 35.3° with the pile-up plane and results in cleavage fracture. The calculation results are verified by Electron Backscatter Diffraction in cleavage fractured Al₆₇Mn₈Ti₂₅ specimens after bending at room temperature. The results indicate that the cleavage cracks in the L1₂-structured Al₆₇Mn₈Ti₂₅ alloy preferetially initiate in crystallography planes {110}.