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

W. Elmay (1) , S. Berveiller (1) , E. Patoor (1) , T. Gloriant (2) , F. Prima (3) , P. Laheurte (1)

1 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
2 ISCR - Institut des Sciences Chimiques de Rennes
3 LPCS - Laboratoire de Physico-Chimie des Surfaces

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 alpha '' 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.

Keywords: transformation; shape-memory; biomedical applications; beta; behavior; microstructure

Domains: Engineering Sciences [physics]; Mechanics [physics.med-ph]; Mechanics of materials [physics.class-ph]

W. Elmay, S. Berveiller, E. Patoor, T. Gloriant, F. Prima, et al.. Texture evolution of orthorhombic α″ titanium alloy investigated by in situ X-ray diffraction. Materials Science and Engineering: A, 2017, 679, pp.504-510. ⟨10.1016/j.msea.2016.10.072⟩. ⟨hal-01438109⟩