Acta Physica Sinica,
Год журнала:
2024,
Номер
74(3), С. 0 - 0
Опубликована: Дек. 26, 2024
The
phase
selection
mechanism
and
eutectic
growth
kinetics
of
Nb<sub>81.7</sub>Si<sub>17.3</sub>Hf
alloy
were
investigated
by
electrostatic
levitation
technique.
maximum
undercooling
this
reached
404
K(0.19<i>T</i><sub>L</sub>).
By
analyzing
the
cooling
curves,
its
hypercooling
limit
was
derived
as
527
K(0.24<i>T</i><sub>L</sub>).
A
critical
194
K
determined
for
transition
solidification
path.
Below
threshold,
(Nb)
firstly
nucleated
grew
primary
dendrites,
resulting
in
enrichment
Si
Hf
residual
melt,
which
would
be
beneficial
to
formation
(Nb)+αNb<sub>5</sub>Si<sub>3</sub>
eutectics.
Therefore,
lamellar
eutectics
formed
interdendritic
spaces.
With
increase
undercooling,
velocity
dendritic
followed
a
power
function,
while
increased
slowly.
values
89.4
mm∙s<sup>-1</sup>.
modified
LKT/BCT
model
used
calculated
dendrites.
results
good
agreement
with
experimental
values,
indicating
that
LKT
can
describe
rapid
dendrite
behavior
melt
few
modifications.
Meanwhile,
spacing
notably
decreased
360
nm
at
undercooling.
Above
dendrites
disappeared,
whereas
Nb<sub>3</sub>Si
phases
independently
undercooled
liquid
anomalous
function
value
115.9
interphase
(Nb)+Nb<sub>3</sub>Si
larger
than
Owing
nanosized
volume
fraction
phase,
fracture
toughness
attained
21.9
MPa∙m<sup>1/2</sup>,
3.4
times
under
small
condition.
Chinese Journal of Space Science,
Год журнала:
2024,
Номер
44(4), С. 607 - 607
Опубликована: Янв. 1, 2024
Chinese
Space
Station
(CSS)
has
been
fully
deployed
by
the
end
of
2022,
and
facility
entered
into
application
development
phase.
It
conducted
scientific
research
projects
in
various
fields,
such
as
space
life
science
biotechnology,
materials
science,
microgravity
fundamental
physics,
fluid
combustion
new
technologies,
applications.
In
this
review,
we
introduce
progress
CSS
provide
an
overview
recent
findings
several
typical
fields.
Such
compelling
mainly
concern
rapid
solidification
ultra-high
temperature
alloy
melts,
dynamics
transport
space,
gravity
scaling
law
boiling
heat
transfer,
vibration
fluidization
phenomenon
particulate
matter,
cold
atom
interferometer
technology
under
high
related
equivalence
principle
testing,
full
cycle
rice
so
forth.
Furthermore,
planned
corresponding
prospects
station
next
few
years
are
presented.
China Foundry,
Год журнала:
2024,
Номер
21(5), С. 588 - 598
Опубликована: Авг. 17, 2024
In
this
work,
a
new
treatment
method
combining
ultrasonic
vibration
with
FeCoNiCrCu
high
entropy
alloy
(HEA)
coating
was
used
to
prepared
Al/Mg
bimetal
through
the
lost
foam
compound
casting.
The
effects
of
composite
involving
and
HEA
on
interfacial
microstructure
mechanical
properties
were
studied.
Results
demonstrate
that
interface
thickness
significantly
decreases
only
26.99%
observed
in
untreated
bimetal.
hinders
diffusion
between
Al
Mg,
resulting
significant
reduction
intermetallic
compounds
interface.
is
composed
Al3Mg2
Mg2Si/AlxFeCoNiCrCu+FeCoNiCrCu/δ-Mg+Al12Mg17
eutectic
structures.
from
has
lower
hardness
than
without
treatment.
acoustic
cavitation
streaming
generated
by
promote
elements
within
coating,
improvement
metallurgical
bonding
quality
Mg
side.
fracture
position
shifts
side
shear
strength
increases
32.16
MPa
63.44
increasing
97.26%.
