Microstructure And Mechanical Proprtities Of Thermo-mechanical Training Ti-V-Al Shape Memory Alloy

Ti-V-Al is widely used in the aerospace industry.It can be improved by mechanical processing such as cold rolling and cold drawing,but it is limited to small components and cannot be used in the preparation of aerospace connectors.the study proposed a thermomechanical training method to prepare Ti-V-Al shape memory alloy with good performance.The microstructure and strain recovery characteristics of thermomechanical training Ti-V-Al alloy were systematically studied.The microstructure of Ti-V-Al alloy was analyzed by thermomechanical training temperature,tensile deformation and thermomechanical training times.The influence law and mechanism of martensitic transformation,mechanical properties and shape memory effect.The high temperature mechanical properties and strain recovery characteristics of Ti-V-Al alloy prepared by hot forging method were studied systematically.The preparation process of Ti-V-Al alloy prepared by thermomechanical training method was studied.When the thermomechanical training temperature is 650? or below,there was no shape memory effect in the alloy.When the thermomechanical training temperature is 700? and 750?,the alloy shape memory effect was obviously improved,when the thermomechanical training temperature rises to 800?,the properties of the alloy were similar to the solid solution alloy.When 6% tensile deformation was used,the alloy were mainly small martensite variants,which can improve the shape memory effect of the alloy;8% tensile deformation could optimize the martensite when the preferred orientation of the martensite variants shape memory effect.When the tensile deformation increased to 10%,the alloy introduced more plastic deformation so that shape memory decreased significantly.With the increase of the times of thermomechanical training,the shape memory effect of the alloy first increased and then decreased,and the shape memory effect was optimal when the thermomechanical training was performed 3 times.When the thermomechanical training is 3 times,the thermomechanical training temperature was 700?,the memory effect could reach 4% under 6% tensile deformation,and the recoverable strain could be up to 6%.When the thermomechanical training was 3 times,the thermomechanical training temperature was 750?.The shape memory effect of the 8% tensile deformation could reach 4.2%,and the recoverable strain could reach 6.6%.The hot forging method for preparing Ti-V-Al alloy had good mechanical properties.The mechanical properties of Ti-V-Al alloy prepared by solid solution and hot forging were similar at high temperature.With the increased of temperature,the elongation of the alloy increased first and then decreased.The hot-forging preparation of Ti-V-Al alloy had a strain recovery characteristic equivalent to room temperature below 300?,and the memory effect decreased rapidly after exceeding 300?.At the same time,with the increased of the times of thermomechanical training,the dimensional shrinkage of the alloy showed a monotonous downward trend.