Twinning system selection in a metastable β-titanium alloy by Schmid factor analysis

Emmanuel Bertrand (1) , Philippe Castany (1) , Isabelle Péron (1) , Thierry Gloriant (1)

1 ISCR - Institut des Sciences Chimiques de Rennes

Electron backscattering diffraction and Schmid factor analysis were used to study the twinning variant selection in a Ti-25Ta-24Nb (mass%) metastable β-titanium alloy. The two twinning systems {1 1 2}〈1 1 1〉 and {3 3 2}〈1 1 3〉 were observed. For each system the Schmid factor was shown to be a relevant parameter to determine the activated variant. Moreover, selection between the two twinning systems depends on the crystallographic orientation of the grain with respect to the tensile direction.

Mots clés: Titanium alloy; Electron backscattering diffraction; Twinning; Schmid factor

Domaines: Génie chimique

Emmanuel Bertrand, Philippe Castany, Isabelle Péron, Thierry Gloriant. Twinning system selection in a metastable β-titanium alloy by Schmid factor analysis. Scripta Materialia, 2011, 64 (12), pp.1110-1113. ⟨10.1016/j.scriptamat.2011.02.033⟩. ⟨hal-00926958⟩