Open Access
Article Number 06032
Number of page(s) 4
Section Applied Research and Applications: Testing and Modelling
Published online 01 September 2009
ESOMAT 2009, 06032 (2009)
DOI: 10.1051/esomat/200906032

Relation between crystal quality and fatigue life of a Cu-Al-Be single crystal shape memory alloy under repeated bending.

N. Siredey-Schwaller1, A. Eberhardt1, E. Patoor2 and P. Bastie3, 4

1  Laboratoire de Physique et Mécanique des Matériaux, FRE CNRS 3236, ISGMP, Ecole Nationale d’Ingénieurs de Metz, Ile du Saulcy, F- 57045 Metz cedex 01, France
2  Laboratoire de Physique et Mécanique des Matériaux, FRE CNRS 3236, ISGMP, ENSAM, 57 Metz cedex, France
3  Laboratoire de Spectrométrie Physique, BP 87, 38402 Saint Martin d’Hères cedex, France
4  Institut Laue-Langevin, BP 156, 38042 Grenoble cedex 9, France

Published online: 1 September 2009

The purpose of this study is to determine the parameters influencing the life of single crystalline Cu-Al-Be shape memory alloys. A strong correlation is found between crystal quality and fatigue life. For that purpose, a special device located at ILL (Institut laue-langevin) in Grenoble is employed. This device is a hard X-ray diffractometer using a transposition at high energy of the Guinier-Tennevin method. Thanks to these X-ray studies, it is found that mechanical lifespan is very sensitive to crystalline quality. In presence of sub-grains (even if disorientation between subgrain is lower than 3°) or in presence of mosaïcity (distribution of the orientation of reticular planes around a mean value), the lifespan can be reduce by a factor of 10.

© Owned by the authors, published by EDP Sciences 2009