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- Title
Characteristics of microcrack initiation in CuNiAl shape memory alloy.
- Authors
LU, Y. H; QIAO, L. J; CHU, W. Y
- Abstract
ABSTRACT The mechanism of microcrack initiation in CuNiAl shape memory alloy was investigated through in situ tensile tests under optical microscopy, scanning electron microscopy and transmission electron microscopy. The results indicated that various martensite phases appeared first around a notch tip upon loading, and then microcracks initiated along the martensite/parent interface. The small martensite regions could transform back to the parent phase not only upon unloading but also upon loading or during crack propagation. There was no dislocation emission and motion before martensite formation. The slip bands formed after the crack had propagated a definite distance, and the microcracks nucleated and the cracks propagated either along the slip bands or the martensite/parent interface.
- Subjects
MARTENSITIC transformations; COPPER-nickel alloys
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2002, Vol 25, Issue 5, p509
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1046/j.1460-2695.2002.00519.x