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Texture evolution of orthorhombic α″ titanium alloy investigated by situ X-ray diffraction

Article dans une revue avec comité de lecture
Author
ELMAY, Wafa
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
BERVEILLER, Sophie
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
PATOOR, Etienne
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
GLORIANT, Thierry
194938 Institut des Sciences Chimiques de Rennes [ISCR]
PRIMA, Frederic
1006 Laboratoire de Physico-Chimie des Surfaces [LPCS]
LAHEURTE, Pascal
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]

URI
http://hdl.handle.net/10985/13314
DOI
10.1016/j.msea.2016.10.072
Date
2017
Journal
Materials Science and Engineering: A

Abstract

The present paper deals with an in-situ X-ray diffraction analysis during cyclic tensile tests of a fully martensitic Ti-24Nb alloy. Texture evolution of martensite α″ phase was followed during loading-unloading cycles. Preferential formation and reverse transformation of particular martensite variants have been observed based on pole figure analysis. The occurrence of the deformation mechanisms for the martensitic Ti-24Nb alloy was also commented by coupling microstructural observations during in-situ experiments and additional cyclic tests followed by heating after each unloading. Through the study of the evolution of the lattice strain, it was found that under loading conditions, the {020} planes exhibit a large tension lattice strain while the {200} planes are subjected to a compression solicitation, which causes the lattice parameters a and c to be shrunk, and b to be elongated.

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