Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Июнь 2, 2025
Tantalum
(Ta)
and
its
alloys
are
widely
used
in
electronics,
dental
implants,
aerospace,
nuclear
industries.
Ta-based
medical
implants
have
also
attracted
considerable
attention
recent
years.
However,
challenges
such
as
thermal
conductivity,
oxidation
resistance,
antibacterial
properties,
the
mismatch
between
bone
implant
mechanical
properties
remain
major
concerns
across
various
applications.
The
addition
of
alloying
elements,
copper
(Cu),
to
Ta
reduces
bacterial
adhesion
applications,
while
improving
conductivity
making
it
beneficial
for
high-temperature
environments.
Furthermore,
incorporating
porosity
into
materials
mitigates
stress
shielding
weight,
enhances
dissipation
advanced
engineering
While
numerous
studies
investigated
physical
alloys,
combined
influence
elements
on
response
these
biomaterials
has
not
been
systematically
studied.
This
study
employs
molecular
dynamics
(MD)
simulations
analyze
microstructural
evolution
porous
Ta/5
wt%
Cu
under
uniaxial
tensile
loading.
Our
results
demonstrate
that
optimizing
strain
rates
introducing
pores
can
modulate
characteristics
Ta/Cu
alloys.
Increasing
rate
from
5
×
108
1011
s-
1
due
rapid
BCC-to-FCC
phase
transformation
at
high
rates,
increasing
0
10%
yield
elastic
modulus
by
12%
14%,
respectively.
Moreover,
deformation-induced
transformations,
twinning
behavior
crystallographic
changes,
is
examined.
offers
insights
designing
with
improved
performance
characteristics.
Metals,
Год журнала:
2025,
Номер
15(4), С. 405 - 405
Опубликована: Апрель 4, 2025
This
study
comprehensively
evaluates
a
non-weldable
nickel-cobalt-based
superalloy
fabricated
using
laser
powder
bed
fusion
(LPBF)
technology.
The
investigation
systematically
examined
the
impact
of
heat
treatment,
specifically
solution
treatment
and
followed
by
aging
on
microstructural
characteristics
evolution
residual
stress
within
alloy.
findings
indicated
that
as-built
Ni-Co-based
predominantly
consists
equiaxed
crystals
epitaxial
columnar
crystals,
with
no
formation
γ′
phase
observed.
After
alloy
experienced
crystallization,
recrystallization,
grain
refinement.
Additionally,
significant
quantity
phases
exhibited
specific
arrangement
precipitation.
Following
there
was
an
observed
increase
in
average
dimensions
both
grains
distribution
perpendicular
to
construction
direction
alloy,
before
following
assessed
contour
method.
results
showed
progressively
diminished
levels
Furthermore,
this
discusses
interrelationship
between
evolutions
superalloys
throughout
process.
Sensors,
Год журнала:
2025,
Номер
25(8), С. 2584 - 2584
Опубликована: Апрель 19, 2025
In
laser-directed
energy
deposition
(LDED)
additive
manufacturing,
stress-induced
deformation
and
cracking
often
occur
unexpectedly,
and,
once
initiated,
they
are
difficult
to
remedy.
To
address
this
issue,
we
previously
proposed
the
Dynamic
Counter
Method
(DCM),
which
monitors
internal
stress
based
on
layer
shrinkage,
enabling
real-time
monitoring
without
damaging
component.
validate
method,
used
AlSi10Mg
material,
has
a
low
melting
point
high
reflectivity,
developed
high-precision
segmentation
network
DeeplabV3+
test
its
ability
measure
shrinkage
in
high-exposure
images.
Using
reconstruction
model,
calculations
were
performed
with
DCM
thermal–mechanical
coupling
simulations,
results
validated
through
XRD
residual
testing
confirm
DCM’s
accuracy
calculating
aluminum
alloys.
The
show
that
accurately
extracted
deposition-layer
contours
information.
Furthermore,
simulations
showed
good
consistency
distribution,
all
falling
within
experimental
error
range.
terms
of
evolution
trends,
was
also
effective
predicting
variations.
Based
these
findings,
two
loading
strategies
proposed,
for
first
time,
application
online
large
LDED
components
validated,
offering
potential
solutions
large-scale
assemblies.
