|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Characterization of Chape Memory Ti-Ni-Hf Alloys
||Walman Benicio Castro, Roniere Leite Soares; Walman Benicio de Castro, Roniere Leite Soares
|On-Site Speaker (Planned)
||Walman Benicio Castro; Walman Benicio de Castro
Although a large variety of potential applications for shape memory alloys require materials having the transformation temperatures above lOO oC, the martensitic points in commercial binary Ni-Ti alloys do not exceed 90- lOO oC.. Recently, Zr and Hf additions have been suggested to increase the transformation temperatures of Ni-Ti. Particularly, substitution of 8 - 20% Hf for Ti has been reported to raise martensitic points up to 400°C.
Solidification structures and shape memory characteristics of Ni-Ti-Hf (at.%) ribbons prepared by melt spinning were investigated by means of differential scanning calorimetry and X-ray diffraction. In these experiments, particular attention has been paid to change the velocity of cooling wheel from 20 to 40 m/s. When the ribbon is produced at a wheel velocity of 40 m/s in melt spinning, the degree of supercooling becomes high because of its thinner thickness and martensitic transformation decreases.
||Planned: None Selected