The Influence Of Rare Earth Element Lanthanum And Cerium On The Matensite Trnsformation Of Titanium-Nickel Alloy

In this paper, small amount of rare earth element Cerium and Lanthanum are added to the near-equal atomic Titanium-Nickel Shape Memory Alloy, Differential Scanning Calorimetry (DSC) and X-ray diffraction technique are applied to study the influence of the small amount of the rare earth element Ce La on the phase transformation type of Ti-Ni alloy, the temperature of phase transformation and the phases in Ti-Ni Shape Memory Alloy, and TEM also is applied to observe the morphology of martensite. The results show that adding little content of rare earth element Lanthanum or Cerium to Ti-Ni Shape Memory Alloy can improve the temperature of the phase transformation of Ti-Ni alloy obviously, and also change the relative content of every phase in Ti-Ni Shape Memory Alloy, but in contrast with the binary Ti-Ni alloy, the kinds of phases in Ti-Ni-Ce or Ti-Ni-La alloy don't change, they are parent phase (B2) whose crystal lattice type is like that of CsCl and B19'martensite with distorted monoclinic lattice.