J. Phys. IV France
Volume 112, October 2003
Page(s) 553 - 556

J. Phys. IV France
112 (2003) 553
DOI: 10.1051/jp4:2003946

A modified Cu-Al-Nb shape memory alloy obtained by melt-spinning

R.M. Gomes1, R.E. Coelho1, C.J. de Araujo2, A.G. de Souza3, T.A.A. Melo1 and S.J.G. de Lima1

1  Universidade Federal da Paraiba, Centro de Tecnologia, Departamento de Tecnologia Mecânica, Laboratorio de Solidificaçao Rapida, Joao Pessoa-PB, CEP 58059-900, Brazil
2  Universidade Federal da Paraiba, Departamento de Engenharia Mecânica, Campus II, Caixa Postal 10069, Campina Grande-PB, CEP 58109-970, Brazil
3  Universidade Federal da Paraiba, Centro de Ciências Exatas e da Natureza, Departamento de Quimica, Laboratorio de Termoquimica e Materiais, Joao Pessoa-PB, CEP 58059-900, Brazil

Nb modified Cu-Al-Ni shape memory alloys with different Ni contents (1.0, 2.0 and 3.0wt%) were processed using the melt spinning technique. The microstructures and the characteristic transformation temperatures were detennilled by x-ray diffraction and thennal analysis (differential scanning calorimeter and thennomechanical analysis) respectively. It was observed that all as-melt spun ribbon microstructures present the $\gamma_2$ phase and some peaks that are thought to be from the 18R type martensite. After water quenching the microstuctures of the ribbons are fully 18R and 2H type martensites. The typical Ms, Mf, As and Af temperatures are shifted to lower values with increasing the Ni concentration.

© EDP Sciences 2003