Transmission of {332}(113) twins across grain boundaries in a metastable β-titanium alloy

• Plastic deformation by dislocation slip and twinning is investigated in a metastable body centered cubic Ti-Mo alloy. Experimental crystal orientation maps show twin lamellae connected across grain boundaries, especially when they host low angle misorientation angles. A three-dimensional crystal plasticity based finite element model (CPFEM) is used to predict internal stresses due to deformation twinning. It is found that twin transmission across grain boundaries relaxes the strong back-stresses at the twin tip more than dislocation slip does. CPFEM predictions also indicate that the forward-stresses, which promote twinning in the adjacent grain, depend not only on the crystal misorientation angle but also on the misorientation axis, and the inclination of the grain boundary plane. © 2018 Elsevier Ltd.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Keyword

Crystal plasticity

EBSD

Finite element modeling

Residual stresses

Twinning

Binary alloys

Dislocations (crystals)

Finite element method

Grain boundaries

Molybdenum

Molybdenum alloys

Plasticity

Single crystals

Titanium alloys

Crystal misorientation

Crystal orientation maps

Grain boundary plane

Low-angle misorientation

Metastable beta-titanium alloys

Three-dimensional crystals

Crystal orientation

Materialteknik

Materials Engineering

Materials Science

Materialvetenskap

Publication and Content Type

ref (subject category)

art (subject category)