Numéro
J. Phys. Colloques
Volume 43, Numéro C4, Décembre 1982
ICOMAT-82
International Conference on Martensitic Transformations
Page(s) C4-303 - C4-307
DOI https://doi.org/10.1051/jphyscol:1982442
ICOMAT-82
International Conference on Martensitic Transformations

J. Phys. Colloques 43 (1982) C4-303-C4-307

DOI: 10.1051/jphyscol:1982442

CRYSTALLOGRAPHIC ANALYSIS OF MARTENSITES IN Zr-Nb-Al

H.A. Peretti, J.C. Bolcich et M. Ahlers

Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, 8400 - S.C. de Bariloche, Argentina


Abstract
In the ternary system Zr-7Nb-1Al (wt.%), by means of small variations in the Nb content, it is possible to obtain after water quenching any of the following : a) spontaneous martensite ; b) spontaneous martensite plus beta phase retained ; c) only beta phase. The beta phase always contains omega precipitates. After quenching, two types of spontaneous martensite have been observed : acicular α' and bent α'C. The latter has a curved interface with respect to the beta matrix. A third type of martensite α'D can be induced by deformation of the beta phase, and appears as sharp needles on the sample surface. Habit plane determinations of spontaneous acicular α' and deformation induced α'D martensites result in poles close to {334}β. It is concluded that more than one inhomogeneous shear system can be active, consistent with the twinned and untwinned morphologies of α' and α'D martensites respectively. This also explains the curved macroscopic interface of the bent martensite α'C.