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Transmission of {332}<113> twins across grain boundaries in a metastable beta-titanium alloy

By Fengxiang Lin (UCLouvain)
Co-authors: Matthieu Marteleur (UCLouvain)
Pascal Jacques (UCLouvain)
Laurent Delannay (UCLouvain)

Titanium (Ti) alloys are subjected to intensive researches due to their unique properties, such as low density, biocompatibility and good corrosion resistance. By controlling the chemical composition, a recently developed metastable β-Ti alloy has an exceptional combination of strength and ductility, thanks to the enhanced work hardening ability from twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP). The present work addresses twinning in such alloys.  Unlike deformation twins in metals with a face centered cubic structure, which are usually confined inside single grains, {332}<113> twins of Ti alloys are observed to transmit across grain boundaries, and even to form twin chains. The objective of this work is to investigate the transmission of twins across grain boundaries in a metastable β-Ti alloy, Ti-12Mo. We first construct a 3D finite element model to predict local stresses at twin tips due to the twin shear strain. With this model, we can vary the geometry of twin/grain boundary intersections and misorientations across the grain boundaries. Based on the finite element simulation and comparison with experiments, we propose criteria for transmission of twins across grain boundaries in β-Ti. 

Ⓒ Photos:Toerisme Leuven