The thermal cycling stability of martensitic transformation in (Ti54Ni34Cu12)100-xNbx (x = 0, 6 and 10 at.%) was investigated. The results show that doping Nb into Ti54Ni34Cu12 enhances the thermal cycling stability of the material. After 400 thermal cycles, the shift of martensitic transformation start temperature of Ti54Ni34Cu12 and (Ti54Ni34Cu12)90Nb10 alloys are 1.5 °C and 0.1 °C, respectively. This improvement can be ascribed to the fact that the proper doping of Nb does not significantly reduce the value of λ2, whereas improves the other cofactor conditions (CC2 and CC3) and the yield strength.
Bibliographical noteFunding Information:
This work was supported by National Natural Science Foundation of China [grant number 51671064 ], the Fundamental Research Funds for the Central Universities [grant number HEUCFG201836 ] and Key Laboratory of Superlight Materials & Surface Technology (Harbin Engineering University), Ministry of Education. XT would like to appreciate the valuable discussion with Dr. Chen. HG and RDJ were supported by the MURI project FA9550-12-1-0458 and by the Renewable Development Fund of the Institute on the Environment at the University of Minnesota.
- Differential scanning calorimetry
- Martensitic phase transformation
- Shape memory alloys
- Thermal cycling stability