ULTRASONIC ATTENUATION AND VELOCITY CHANGES DURING THE FCC-HCP MARTENSITIC TRANSFORMATION IN COBALT-NICKEL G.A. Kneezel et A.V. Granato J. Phys. Colloques, 42 C5 (1981) C5-1061-C5-1065 DOI: 10.1051/jphyscol:19815164