Encyclopedie de la recherche sur l'aluminium au Quebec - Edition 2014 | Page 73
TRANSFORMATION ET APPLICATIONS // TRANSFORMATION AND APPLICATIONS
Model
for
yield
strength
in
precipita)on
strengthened
Al-‐B4C
composites
at
POUR LA LIMITE D'ÉLASTICITÉ DANS UNE PRÉCIPITATION
UN MODÈLE elevated
temperature
71
Un
modèle
pour
la
RENFORCÉE D'UN COMPOSITE Al-B4C À TEMPÉRATURE ÉLEVÉE
limite
d’élas)cité
dans
une
MODEL FOR YIELD STRENGTH IN
précipita)on
renforcée
d’un
composite
Al-‐B4C
aPRECIPITATION STRENGTHENED
Al-B
température
élevée
4C COMPOSITES AT ELEVATED TEMPERATURE
Jian
Qin1,
Zhan
Zhang2,
X.-‐Grant
Chen3
1
Ph.D.
candidate, Applied Science, University of Quebec at Chicoutim
2
professor
in
Université
du
Québec
à
Chicou)mi
3
chairman
of
NSERC/Rio
Tinto
Alcan
Industrial
Research
Chair
in
Metallurgy
of
Aluminium
Transforma)on,
professor
in
Université
du
Québec
à
Chicou)mi
Introduc)on
Al-‐B4C
composites
as
neutron
absorber
materials
have
been
widely
used
for
the
transport
and
storage
of
spent
nuclear
fuels
in
the
nuclear
industry.
Sc
and
Zr
have
been
introduced
into
the
Al‒B4C
composite
to
form
coherent
precipitates
offer
strengthening
at
elevated
temperature.
In
my
previous
study
the
mechanical
property
at
elevated
temperature
of
Experimental
1.
Sample
Prepara,on:
Cast
ingots
of
two
Al-‐B4C
composites,
S40
(Al-‐15vol.%B4C
with
0.4wt.%
Sc)
and
SZ40
(Al-‐15vol.%B4C
with
0.4wt.%
Sc
and
0.24wt.%
Zr)
were
prepared.
The
heat
treatment
was
carried
out
as
the
following
condi)ons:
Step
the
composite
is
increasing
associate
with
coarsening
of
the
precipitates.
There
is
no
clear
understanding
of
the
Solution
strengthening
mechanism
at
elevated
temperature,
therefore,
it
is
very
necessary
to
establish
a
model
for
the
materials
Annealing
time at
300ºC
(hour)
contain
coherent
precipitate.
The
overall
strength
σt
of
a
material
with
various
opera)ve
strengthening
mechanism,
each
with
a 4