DEFORMATION AND FRACTURE OF TWO-PHASE TiAl BASE ALLOY WITH A LAMELLAR STRUCTURE AT ROOM TEMPERATURE
LIANG Wei;LI Qiang;YANG Dezhuang (Harbin Institute of Technologli; Harbin 150001)(Taiyuan University of Technology; Taiyuan 030024)
Cite this article:
LIANG Wei;LI Qiang;YANG Dezhuang (Harbin Institute of Technologli; Harbin 150001)(Taiyuan University of Technology; Taiyuan 030024). DEFORMATION AND FRACTURE OF TWO-PHASE TiAl BASE ALLOY WITH A LAMELLAR STRUCTURE AT ROOM TEMPERATURE. Acta Metall Sin, 1997, 33(3): 292-296.
Abstract In situ TEM tensile experiments show that the principal reason for the poor ductility at room temperature of TiAl base alloys with lamellar structure is the lack of slip systems, eventhough (1/2)＜110] ordinary dislocations exhibit good mobility and (1/6)＜112] deformation twinning is activited in some γ-lamella phase. The key to improve the room temperature ductility of TiAl base alloy is to operate other slip systems apart from (1/2)＜110]{111).
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