Effects of different cold-rolled deformation rates on super-elasticity and microstructure of TiNiCr shape memory alloys have been investigated by tensile testing and optical microscopeom.Experimental results indicate that the super-elasticity of TiNiCr shape memory alloys can be increased with increasing in cold deformation rate

however

itsincerease can be ignored with the cold deformation rate more than 33%.In addition

totally non-linear super-elasticity of the alloy can not be obtained in the condition of cold deformation.A martensite variant can be created in the TiNiCr shape memory alloys during cold deformation

whose volume would be increased with the increase of cold deformation rate when the cold deformation rate is more than 27%

and whose dislocation is increased with the increase of cold deformation rate.