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Measurement of lattice rotations and internal stresses in over one hundred individual grains during a stress-induced martensitic transformation

Conférence invitée
Author
EL HACHI, Younes
MALARD, Benoît
580 Centre interuniversitaire de recherche et d'ingénierie des matériaux [CIRIMAT]
WRIGHT, Jonathan
2568 European Synchrotron Radiation Facility [ESRF]
ccBERVEILLER, Sophie
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]

URI
http://hdl.handle.net/10985/13334
DOI
10.1051/matecconf/20153302003
Date
2015

Abstract

To better understand the properties of polycrystals at a microscopic scale during cyclic mechanical loading we have measured the relationship between grain orientations, their positions inside the sample and their internal stresses. In this work, in-situ 3DXRD technique was performed on over hundred grains during the stress-induced martensitic transformation in a Cu-Al-Be shape memory alloy. Information about the position, orientation, and stress field was obtained for each austenitic grain. These results have been used to develop a procedure that allows automatic processing for a large number of grains, matching them during loading and leads to a quantitative stress field. A strong heterogeneity of stress state between the grains at the surface and in the volume is evident.

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