Abstract
The two-way shape memory effect in a Ti-18.5Zr-10Nb-3.5Ta high-temperature shape memory alloy was investigated.X-ray diffraction measurement shows that the alloy is composed of orthorhombic α"-martensite.ω phase is not found in Ti-18.5Zr-10Nb-3.5Ta alloy due to the suppressing effect of Ta element.The α"-martensite laths are found in the transmission electron microscope observation;after the bending deformation,there appear a lot of dislocations.The alloy exhibits a shape memory strain of 3.8％and a high reverse martensite transformation start temperature of 464 K.The maximum two-way shape memory strain of 1.2％is obtained in the alloy with the pre-bending training strain of 10％.The mechanism can be ascribed to the effect of internal stress field caused by dislocations.
基金项目
National Natural Science Foundation of China(51371016)
Fundamental Research Funds for the Central Universities(YWF-16-BJ-J-49)
Fundamental Research Funds for the Central Universities(YWF-17-BJ-J-23)
NETL
NSTL
万方数据