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Structural transformations in Ti-Ni-Cu shape memory ribbons

C. M. CRACIUNESCU1,2,* , I. MIHALCA1,2, A. ERCUTA3

Affiliation

  1. "Politehnica" University of Timisoara, Blvd. Mihai Viteazul 1, 300222 Timisoara, Romania
  2. National Institute for Research and Development in Electrochemistry and Condensed Matter, P.A. Podeanu str., no. 144, 300569 Timisoara, Romania
  3. West University of Timisoara, Blvd V. Parvan 4, 300223, Timisoara, Romania

Abstract

Ti-Ni-Cu shape memory alloy ribbons produced by melt-spinning were investigated in order to assess the crystallinity and the influence of further crystallization on the martensitic transformation. The as-quenched ribbons are partially crystalline, with grains in the range of microns and typical martensitic structure. As result of heating the ribbons, a peak develops around 460oC and, on further cooling, the physical evidence of the martensitic transformation reflected in the DSc peak is increased several times. Both the crystallization and the martensitic transformation have been investigated as a function of the heating and cooling rates. It is concluded that a significant part of the Ti-Ni-Cu shape memory alloy ribbons produced by meltspinning fully crystallizes only after a heat treatment that leads to a full martensitic transformation and the shape memory effect..

Keywords

Ti-Ni-Cu, Meltspinning, Crystallization, Martensitic transformation, Shape memory alloys.

Submitted at: Oct. 10, 2007
Accepted at: Dec. 7, 2007

Citation

C. M. CRACIUNESCU, I. MIHALCA, A. ERCUTA, Structural transformations in Ti-Ni-Cu shape memory ribbons, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 12, pp. 3769-3773 (2007)