Micro s
li
p activation and localization in
Ti
-
6Al
-
4V
deformed in tension have
been
examined
quantitatively
using high
-
resolution (HR) digital image correlation (DIC)
,
HR
-
e
lectron
backscatter diffraction
(EBSD)
and crystal plasticity
finite element
modelling
.
The
measured
polycrystal slip, strain, lattice rotation and
g
eometrically
necessary d
islocation (GND
)
density
distributions
are generally
well captured
by the
a priori
crystal plasticity model based on
the
rate
-
sensitive properties of
α
-
titanium.
An overall slip t
race analysis showed over 80%
agreement between
HR
-
DIC and crystal plasticity modelling
of
th
e primary slip activation
.
The
texture beneath the
characterised free
-
surface has been found to
affect
the local slip,
stress
distribution
,
lattice curvature and GND density
and
three
texture
variations
have been
considered
.
Grain
-
level
slip trace analysis shows that the crystal plasticity modelling can
capture
single
(
straight
)
slip,
multiple slip activation and
complex
wavy
slip
.
The latter
has
been found to result from
the interaction
of
independently activated basal and
prismatic slip
systems
with
common
slip direction
. I
nitial inter
-
granular misorientations greater than about
5
o
have been shown to influence the subsequent micromechanical grain behaviour including
slip, lattice rotation and GND density. This work contrib
utes to the understanding of slip
localization and load shedding in dwell fatigue in
polycrystalline hexagonal materials
.