Room-temperature phases observed in Ti53 - XNi47Zrx high-temperature shape memory alloys
Journal
Journal of Alloys and Compounds
Journal Volume
266
Journal Issue
1-2
Pages
276-282
Date Issued
1998
Author(s)
Abstract
Ti53 - xNi47Zrx (x=5-20 at %) shape memory alloys exhibit martensitic transformation characteristics and their transformation temperatures increase linearly with increasing Zr content. There are three different phases observed in 900°C homogenized alloys for Zr content ≥ 10 at %, including the grey (Ti,Zr)Ni matrix, the black (Ti,Zr)2Ni particles and the white λ1 phase. But only the former two phases are found in the Ti48Ni47Zr5 alloy. DTA test results show that the homogenized Ti38Ni47Zr15 alloy has three endothermic peaks in the thermograph, in which the 930°C endothermic peak is associated with the solid↔liquid transition of λ1 phase, the peak at 990°C is associated with the reverse peritectic transformation of (Ti,Zr)2Ni→(Ti,Zr)Ni+liquid and the one at 1160°C is the dissolution reaction of the (Ti,Zr)Ni→liquid. © 1998 Elsevier Science S.A.
Type
journal article