Influence of Rapid Solidification on Ni50-xTi50Cox Shape Memory Alloys

M. Larnicol; R. Portier; P. Ochin

doi:doi:10.1051/jp4:1997530

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Volume 07 / No C5 (November 1997)

J. Phys. IV France, 07 C5 (1997) C5-191-C5-196

Abstract

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Issue		J. Phys. IV France Volume 07, Number C5, November 1997 IV^th European Symposium on Martensitic Transformations


Page(s)		C5-191 - C5-196
DOI		https://doi.org/10.1051/jp4:1997530

IV^th European Symposium on Martensitic Transformations

J. Phys. IV France 07 (1997) C5-191-C5-196
DOI: 10.1051/jp4:1997530

Influence of Rapid Solidification on Ni_50-xTi₅₀Co_x Shape Memory Alloys

M. Larnicol^{1, 2}, R. Portier^{1, 2} and P. Ochin²

¹ Laboratoire de Métallurgie Structurale, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris cedex 05, France
² Centre d'Étude de Chimie Métallurgique, CNRS, 15 rue G. Urbain, 94407 Vitry-sur Seine, France

Abstract
Rapidly solidified (R.S.) Ni_50-xTi₅₀Co_x ribbons have been produced by a single roller melt spinning technique. The influence of rapid solidification experimental parameters on the structure and transition behaviour were investigated by DSC, by X-ray diffraction and by TEM. The DSC curves are stable from the first cycle and a preferred orientation exists in the rapidly solidified NiTiCo alloys. An experimental parameter such as quenching temperature increasing is followed by the precipitate growth. These precipitates of Ti₂Ni, may be responsible for the martensitic and R transition temperature decreasing. Annealings enlarge the precipitate size and the transition temperatures decrease again.