Metals,
Год журнала:
2025,
Номер
15(3), С. 247 - 247
Опубликована: Фев. 26, 2025
The
excellent
mechanical
properties
of
high-entropy
alloys,
especially
under
harsh
service
environments,
have
attracted
increasing
attention
in
the
last
decade.
FCC-based
and
refractory
alloys
(HEAs)
are
most
extensively
used
series.
However,
strength
FCC-base
HEAs
is
insufficient,
although
they
possess
a
great
ductility
fracture
toughness
at
both
room
low
temperatures.
With
regard
to
BCC-based
HEAs,
unsatisfactory
temperature
shadows
their
ultrahigh
high
temperatures,
as
well
thermal
stability.
In
order
strike
balance
between
toughness,
strengthening
mechanisms
should
be
first
clarified.
Therefore,
typical
performance
corresponding
factors
systemically
summarized,
including
solid
solution
strengthening,
second
phase,
interface,
synergistic
effects
for
along
with
optimization
principal
elements,
construction
multi-phase,
doping
non-metallic
interstitial
introduction
kink
bands
HEAs.
Among
which
design
meta-stable
structures,
such
chemical
short-range
order,
has
been
shown
promising
strategy
further
improve
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 23, 2024
Abstract
Mg‐based
hydrogen
storage
materials
have
drawn
considerable
attention
as
the
solution
for
and
transportation
due
to
their
high
density,
low
cost,
safety
characteristics.
However,
practical
applications
are
hindered
by
dehydrogenation
temperatures,
equilibrium
pressure,
sluggish
hydrogenation
(de/hydrogenation)
rates.
These
functionalities
typically
determined
thermodynamic
kinetic
properties
of
de/hydrogenation
reactions.
This
review
comprehensively
discusses
how
compositeization,
catalysts,
alloying,
nanofabrication
strategies
can
improve
performances
materials.
Since
introduction
various
additives
leads
samples
being
a
multiple‐phases
elements
system,
prediction
methods
simultaneously
introduced.
In
last
part
this
review,
advantages
disadvantages
each
approach
discussed
summary
emergence
new
potential
realizing
lower‐cost
preparation,
lower
operation
temperature,
long‐cycle
is
provided.
Abstract
Owing
to
its
abundant
manganese
source,
high
operating
voltage,
and
good
ionic
diffusivity
attributed
3D
Li‐ion
diffusion
channels.
Spinel
LiMn
2
O
4
is
considered
a
promising
low‐cost
positive
electrode
material
in
the
context
of
reducing
scarce
elements
such
as
cobalt
nickel
from
advanced
lithium‐ion
batteries.
However,
rapid
capacity
degradation
inadequate
rate
capabilities
induced
by
Jahn–Teller
distortion
dissolution
have
limited
large‐scale
adoption
spinel
for
decades.
In
this
study,
1.98
Mg
0.005
Ti
Sb
Ce
(HE‐LMO)
with
remarkable
interfacial
structural
cycling
stability
developed
based
on
complex
concentrated
doping
strategy.
The
initial
discharge
retention
HE‐LMO
are
111.51
mAh
g
−1
90.55%
after
500
cycles
at
1
C.
as‐prepared
displays
favorable
stability,
significantly
surpassing
pristine
sample.
Furthermore,
theoretical
calculations
strongly
support
above
finding.
has
higher
more
continuous
density
states
Fermi
energy
level
robust
bonded
electrons
among
Mn─O
atom
pairs.
This
research
contributes
field
high‐entropy
modification
establishes
facile
strategy
designing
manganese‐based
batteries
(LIBs).
ABSTRACT
High‐entropy
materials
(HEMs)
possess
unique
properties
that
can
be
tailored
for
specific
performance
characteristics,
making
them
suitable
various
battery
applications.
In
particular,
HEMs
have
shown
significant
promise
in
enhancing
the
electrochemical
of
Prussian
blue
analogues
(PBAs)
across
systems,
including
sodium‐ion,
potassium‐ion,
lithium‐sulfur,
aqueous
zinc‐ion,
and
ammonium‐ion
batteries.
This
article
examines
case
studies
to
explore
how
high‐entropy
strategy
enhances
PBA
performance.
It
also
provides
an
overview
traditional
metal
substitution
methods
modifying
two
main
types
PBAs,
is,
Fe‐based
Mn‐based
electrode
materials.
Additionally,
other
optimization
methods,
such
as
defect
modulation,
surface
modification,
composite
structures,
electrolyte
are
discussed.
Finally,
delves
deeply
into
relationship
between
techniques
from
perspectives
element
design
enhancement,
aiming
provide
comprehensive
theoretical
guidance
readers.
Advanced Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 15, 2025
Multicomponent
Ti-containing
ultra-high
temperature
ceramics
(UHTCs)
have
emerged
as
more
promising
ablation-resistant
materials
than
typical
UHTCs
for
applications
above
2000
°C.
However,
the
underlying
mechanism
of
Ti
improving
ablation
performance
is
still
obscure.
Here,
(Hf,Zr,Ti)B2
coatings
are
fabricated
by
supersonic
atmospheric
plasma
spraying,
and
effects
content
on
under
an
oxyacetylene
flame
investigated.
The
(Hf0.45Zr0.45Ti0.10)B2
coating
shows
superior
resistance
cycling
reliability
at
≈2200°C.
A
functionally
graded
oxide
scale
comprising
outer
dense
layer
fine
granular
formed.
former
a
better
oxygen
barrier
owing
to
fewer
cracks
latter
has
high
strain
tolerance
due
finer
grain
size.
uniform
dissolving
≈4
mol%
in
inner
results
refinement
via
sluggish
diffusion
thus
stress
release.
For
layer,
segregation
nanoscale
leads
metastable
cubic
(Hf,Zr,Ti)O2
local
severe
lattice
distortion,
inhibiting
propagation
cracks.
ions'
unique
enables
strong
with
tolerance,
which
responsible
performance.
This
study
provides
new
insights
into
behavior
multicomponent
UHTCs.
