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Proceedings Paper

Ti-content dependence of shape memory characteristics of Ti-Ni-Cu alloy ribbons
Author(s): Jung-Min Nam; Hyun-gon Kim; Gyu-bong Cho; Yeon-wook Kim; Tae-hyun Nam
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Paper Abstract

Transformation behavior, shape memory characteristics and superelasticity of Ti-(40-x)Ni-10Cu(at%)(x=0~2) alloy ribbons were investigated. All ribbons showed the two-stage B2-B19-B19' transformation behavior. The temperature gap between Ms'(the B2-B19 transformation start temperature) and Ms(the B19-B19' transformation start temperature) was large(~ 40 K), which was ascribed to internal stress fields around dislocations introduced by melt spinning. Ti2Ni particles were observed in Ti-39Ni-10Cu and Ti-38Ni-10Cu alloy ribbons, while they were not found in a Ti-40Ni-10Cu alloy ribbon. Volume fraction of Ti2Ni particles increased from 3 % to 12 % with increasing Ti-content from 51 at% to 52 at%. Both Ms and Ms' decreased with increasing Ti-content, which was ascribed to formations of Ti2Ni particles resulting in a decrease in Ti-content of matrix. Ti-(40-x)Ni-10Cu alloy ribbons showed perfect shape memory effect and superelasticity. The transformation hysteresis associated with the B2-B19 transformation was 6-10 K depending on Ti-content.

Paper Details

Date Published: 1 November 2007
PDF: 8 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64232K (1 November 2007); doi: 10.1117/12.779883
Show Author Affiliations
Jung-Min Nam, Gyeongsang National Univ. (South Korea)
Hyun-gon Kim, Gyeongsang National Univ. (South Korea)
Gyu-bong Cho, Gyeongsang National Univ. (South Korea)
Yeon-wook Kim, Keimyung Univ. (South Korea)
Tae-hyun Nam, Gyeongsang National Univ. (South Korea)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering
Shanyi Du; Jinsong Leng; Anand K. Asundi, Editor(s)

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