Deformation and fracture behavior of new strain-transformable titanium alloys: a multi-scale investigation

Chloé Varenne (1, 2) , Frédéric Prima (2) , Cédrik Brozek (2) , Julie Bourgon (3) , Jacques Besson (1) , Anne-Françoise Gourgues-Lorenzon (1)

1 CDM - Centre des Matériaux
2 IRCP - Institut de Recherche de Chimie Paris
3 ICMPE - Institut de Chimie et des Matériaux Paris-Est

Titanium alloys possessing Twinning and Transformation Induced Plasticity effects show promising mechanical properties, particularly high ductility, hardenability, impact and fracture toughness. This work focuses on a strain-transformable, coarse-grained β-Ti-Cr-Sn alloy displaying TWIP effect. To account for the enhanced properties of this alloy, compared to more conventional β-Ti alloys, fracture and deformation features were correlated at different scales. Examinations evidenced a major role of twinning and, more generally, of plasticity-induced phenomena in the ductile fracture process. The resistance of this alloy to plastic deformation (work-hardening), and to crack initiation and propagation is interpreted in view of the progressive, multiscale twinning mechanisms that occur up to the very final stages of fracture.

Domaines: Matériaux

Chloé Varenne, Frédéric Prima, Cédrik Brozek, Julie Bourgon, Jacques Besson, et al.. Deformation and fracture behavior of new strain-transformable titanium alloys: a multi-scale investigation. MATEC Web of Conferences, 2020, 321, pp.11006. ⟨10.1051/matecconf/202032111006⟩. ⟨hal-03065300⟩