The role of stress induced martensite in ductile metastable Beta Ti-alloys showing combined TRIP/TWIP effects

F. Sun (1, 2) , J. Y. Zhang (2, 1) , C. Brozek (1) , M. Marteleur (3) , M. Véron (4) , E. Rauch (4) , T. Gloriant (5) , P. Vermaut (2, 1) , C. Curfs (6) , P. J. Jacques (3) , Frédéric Prima (2, 1)

1 IRCP - Institut de Recherche de Chimie Paris
2 LPCS - Laboratoire de Physico-Chimie des Surfaces
3 IMMC - Institute of Mechanics, Materials and Civil Engineering [Louvain]
4 SIMaP - Science et Ingénierie des Matériaux et Procédés
5 ISCR - Institut des Sciences Chimiques de Rennes
6 ESRF - European Synchrotron Radiation Facility

A new family of metastable beta type titanium alloys has recently been designed for ductility improvement with large strain-hardening effect. Superior plastic properties were obtained due to collective effects of both phase transformation induced plasticity and twinning induced plasticity. A series of stress induced phase transformations, including stress/strain-induced beta to omega transformation and stress-induced martensitic beta to α” transformations, play particular roles at each deformation stage. The SIM transformations were found to be closely related to the strain-hardening behavior of the material. In this work, the relationship between SIM transformations and strain-hardening effect were studied by microstructural investigations.

Mots clés: Deformation mechanism; Martensitic phase transformation; Mechanical twinning; Microstructure; Titanium alloys

Domaines: Chimie

F. Sun, J. Y. Zhang, C. Brozek, M. Marteleur, M. Véron, et al.. The role of stress induced martensite in ductile metastable Beta Ti-alloys showing combined TRIP/TWIP effects. Materials Today: Proceedings, 2015, International Conference on Martensitic Transformations, ICOMAT-2014, 2, Supplement 3, pp.S505--S510. ⟨10.1016/j.matpr.2015.07.336⟩. ⟨hal-01231156⟩