(上海交通大学教育部高温材料及高温测试开放实验室，上海 200030)
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。
关键字: L12结构Al3Ti；解理断裂；电子背散射
（Education Ministry Open Research Lab For High Temperature Materials and Testing,
Shanghai Jiao Tong University, Shanghai 200030, P.R.China）
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}.
Key words: L12-structured Al3Ti；cleavage fracture；Electron Backscatter Diffraction(EBD)
