(上海交通大學(xué)教育部高溫材料及高溫測試開放實驗室，上海 200030)
摘 要: 利用Stroh位錯塞積模型解釋了L12結(jié)構(gòu)Al67Mn8Ti25合金室溫解理裂紋的萌生。計算表明，位錯塞積優(yōu)先在與滑移面成35.3°方向誘發(fā)微裂紋，導(dǎo)致解理斷裂。經(jīng)室溫彎曲斷口解理面取向的電子背散射衍射(EBSD)測試結(jié)果驗證表明，L12結(jié)構(gòu)Al67Mn8Ti25合金室溫解理斷裂裂紋優(yōu)先在｛110｝晶面萌生。
關(guān)鍵字: L12結(jié)構(gòu)Al3Ti；解理斷裂；電子背散射
（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)
