Ti-content dependence of shape memory characteristics of Ti-Ni-Cu alloy ribbons

Jung-Min Nam; Hyun-gon Kim; Gyu-bong Cho; Yeon-wook Kim; Tae-hyun Nam

doi:10.1117/12.779883

1 November 2007 Ti-content dependence of shape memory characteristics of Ti-Ni-Cu alloy ribbons

Jung-Min Nam, Hyun-gon Kim, Gyu-bong Cho, Yeon-wook Kim, Tae-hyun Nam

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 64232K (2007) https://doi.org/10.1117/12.779883
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

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.

Citation Download Citation

Jung-Min Nam, Hyun-gon Kim, Gyu-bong Cho, Yeon-wook Kim, and Tae-hyun Nam "Ti-content dependence of shape memory characteristics of Ti-Ni-Cu alloy ribbons", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64232K (1 November 2007); https://doi.org/10.1117/12.779883

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