Journal of Alloys and Compounds,
Год журнала:
2024,
Номер
1005, С. 175962 - 175962
Опубликована: Авг. 11, 2024
Thermal
spray
high-entropy
alloy
(HEA)
coatings
have
demonstrated
potential
for
improving
the
wear
resistance
of
conventional
materials
used
in
extreme
engineering
environments.
In
present
work,
an
equiatomic
AlCoCrFeNi
HEA
coating
was
manufactured
using
high
velocity
air
fuel
(HVAF)
process.
The
phase
and
microstructural
transformations
gas-atomized
(GA)
powder
during
HVAF
spraying
were
analyzed
SEM,
EDS
EBSD
techniques.
tribological
properties
this
sliding
against
Al2O3
ball
at
both
room
temperature
(RT)
600
°C
also
evaluated.
GA
composed
Body
Centred
Cubic
(BCC)
+
ordered
BCC
(B2)
phases,
which
transformed
to
B2
minor
Face
(FCC)
phases
process,
validating
thermodynamic
prediction
projected
by
Scheil
simulation
non-equilibrium
processing
conditions.
rapid
solidification
impact-assisted
deformation
resulted
significant
grain
refinement
coating,
ultimately
improved
mechanical
micro
nanoscale
levels.
RT
severely
impacted
relatively
brittle
BCC/B2
structure,
leading
susceptibility
abrasive
surface
fatigue.
slightly
lower
due
formation
a
oxide
layer
on
worn
surface,
induced
fatigue
aggravated
mass
loss
coating.
Advanced Sustainable Systems,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 17, 2025
Abstract
This
study
investigates
the
performance
of
high
entropy
alloys
[Fe
3
Cr
Mn
2
NiV,
HEA)]
and
oxides
[(Fe
NiV)O
4
,
HEO)]
as
electrode
materials
for
supercapacitors.
HEA
is
synthesized
through
mechanical
alloying,
followed
by
HEO
forming
via
an
oxidation
process.
XRD
results
demonstrate
comprises
both
amorphous
crystalline
phases,
whereas
has
entirely
structure.
SEM
analyses
showed
exhibits
larger
irregular
particles,
displays
a
smaller
spherical
morphology.
EPR
revealed
significant
changes
in
defect
structures
unpaired
electron
configurations
during
transition
from
to
HEO.
prone
diffusion‐controlled
processes
due
their
regular
structure
strong
magnetic
interactions;
however,
capacitive
behavior
based
on
surface
redox
reactions
pseudo‐capacitive
mechanisms
oxygen
vacancies.
CV
that
contributes
more
reactions,
while
GCPL
suggested
demonstrated
superior
energy
density
(40.8
Wh
kg
−1
)
power
(14.3
kW
).
Impedance
exhibited
reduced
internal
resistance
enhanced
ion
conductivity,
higher
processes.
In
conclusion,
exhibit
distinct
storage
mechanisms,
these
can
be
optimized
supercapacitor
applications.
Journal of Alloys and Compounds,
Год журнала:
2024,
Номер
1005, С. 175962 - 175962
Опубликована: Авг. 11, 2024
Thermal
spray
high-entropy
alloy
(HEA)
coatings
have
demonstrated
potential
for
improving
the
wear
resistance
of
conventional
materials
used
in
extreme
engineering
environments.
In
present
work,
an
equiatomic
AlCoCrFeNi
HEA
coating
was
manufactured
using
high
velocity
air
fuel
(HVAF)
process.
The
phase
and
microstructural
transformations
gas-atomized
(GA)
powder
during
HVAF
spraying
were
analyzed
SEM,
EDS
EBSD
techniques.
tribological
properties
this
sliding
against
Al2O3
ball
at
both
room
temperature
(RT)
600
°C
also
evaluated.
GA
composed
Body
Centred
Cubic
(BCC)
+
ordered
BCC
(B2)
phases,
which
transformed
to
B2
minor
Face
(FCC)
phases
process,
validating
thermodynamic
prediction
projected
by
Scheil
simulation
non-equilibrium
processing
conditions.
rapid
solidification
impact-assisted
deformation
resulted
significant
grain
refinement
coating,
ultimately
improved
mechanical
micro
nanoscale
levels.
RT
severely
impacted
relatively
brittle
BCC/B2
structure,
leading
susceptibility
abrasive
surface
fatigue.
slightly
lower
due
formation
a
oxide
layer
on
worn
surface,
induced
fatigue
aggravated
mass
loss
coating.
