J. Phys. IV France 112 (2003) 893
Phase transformation behavior in Ti-Ni alloy ribbons fabricated by melt spinningT.-H. Nam1, J.-H. Kim1, M.-S. Choi1, H.-W. Lee1 and Y.-W. Kim2
1 Division of Materials Engineering and ERI, Gyeongsang National University, 900 Gazwa-dong, Chinju, Gyeongnam 660-701, Korea
2 Department of Materials Engineering, Keimyung University
Phase transformation behavior of Ti-50Ni and Ti-49Ni (at%) alloy ribbons fabricated by melt spinning, have been investigated. The two-stage B2-R-B19' transformation appeared in as-spun alloy ribbons, while the one-stage B2-B 19'transformation appeared in alloy ribbons heat treated at 873 K. At the linear velocity higher than 36 m/s, the B2-R-B19' transformation was observed in as-spun Ti-49Ni alloy ribbons. In as-spun Ti-SONi alloy ribbons, the B2-RB19' transformation appeared even at the linear velocities of 21 m/s. From TEM observations, it was found that very fine spherical Ti 2Ni particles with the size less than 20 nm were formed in Ti-49Ni alloy ribbons, The Ti 2Ni particles had an orientation relationship to the B2 phase and had coherency strains around them, which was thought to play an important role to induce the R phase transformation.
© EDP Sciences 2003