Tensile Behavior and Plastic Deformation Mechanism of Ti-Al-Fe Alloy at Room Temperature and Liquid Nitrogen Temperature
The tensile properties of Ti-Al-Fe alloy were assessed at 25℃ and-196℃ respectively,aiming to understand the service performance and plastic deformation mechanism of the low-cost Ti-Al-Fe alloy at extreme low temperatures,so that to ensure the service safety of the relevant engineering structures.The microstructure and fracture surface of the alloy were characterized by scanning electron microscope,transmission electron microscope and electron backscatter diffraction technology.The re-sults show that twinning is rarely found in the microstructure of the alloy after plastic deformation at 25℃,and the plastic deformation mechanism is mainly dislocation slipping.Ti-Al-Fe alloy exhibits better strength and plasticity at 196℃,with clear twinning induced plastic effect.A large number of twins are pro-duced during plastic deformation,which include{11(2)2} compression twins,{10(1)2} tensile twins,{11(2)4}compression twins.The plastic deformation mechanism may be ascribed to the coexistence of slipping and twinning.At the initial stage of deformation,{11(2)2} twins are mainly found,and the number of {10(1)2}twins increase at the later stage of deformation.
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