Positron Annihilation Measurements in Cu-Al-Ni Based Shape Memory Alloys I. Hurtado, D. Segers, L. Dorikens-Vanpraet, C. Dauwe and J. Van Humbeeck J. Phys. IV France, 05 C8 (1995) C8-949-C8-954 Published online: 14 July 2014 DOI: 10.1051/jp4/199558949