I. Kubota, T. Inamura, K. Wakashima, H. Hosoda, Tokyo Institute of Technology, Yokohama, Japan; H. Y. Kim, S. Miyazaki, University of Tsukuba, Tsukuba, Japan
Texture of cold-drawn wire of Ti-24mol%Nb-3mol%Al Ni-free Ti-based shape memory alloy was investigated by electron backscatter diffraction pattern (EBSP) analysis. The alloy was fabricated by Ar arc-melting and homogenized at 1273K for 7.2ks in vacuum and then quenched into water. The alloy is parent β-phase at room temperature and thus exhibits superelasticity. The ingot was cold-drawn with a reduction in cross-section higher than 90% and a wire with cross-sectional diameter of 1mm was successfully obtained. The wire was cut into some pieces and solution-treated at 673K, 773K, 873K or 973K for 3.6ks to evaluate effect of annealing temperature on the recrystallization texture. Relationship between texture and superelasticity is discussed on the view point of the crystallography of the α"-martensite which brings superelasticity in this alloy system.
Summary: Texture of cold-drawn wire of Ti-24mol%Nb-3mol%Al Ni-free Ti-based shape memory alloy was investigated by electron backscatter diffraction pattern (EBSP) analysis. The alloy was fabricated by Ar arc-melting and homogenized at 1273K for 7.2ks in vacuum and then quenched into water. The alloy is parent
b-phase at room temperature and thus exhibits superelasticity. The ingot was cold-drawn with a reduction in cross-section higher than 90% and a wire with cross-sectional diameter of 1mm was successfully obtained. The wire was cut into some pieces and solution-treated at 673K, 773K, 873K or 973K for 3.6ks to evaluate effect of annealing temperature on the recrystallization texture. Relationship between texture and superelasticity is discussed on the view point of the crystallography of the
a"-martensite which brings superelasticity in this alloy system.
