Abstract:
In
this
work,
we
have
undertaken
the
study
of
an
Al-Mg
-Si
alloy
of
6000
series
with
excess
silicon
of
the
series
6000,
belongs
to
the
category
of
heat
treatable
alloys.
These
alloys
arouse
great
interest
for
their
privilege
use
in
the
automotive
and
aeronautical
industries.
The
aim
of
the
present
work
is the
study
of
the
thermal
expansion
coefficient
as
a function
of
temperature
for
two
categories
of
aluminum
-based
sheet
in
which
we
have
introduced
a wide
rang
e of
components
of
transitions.
From
each
sheet
, we
collected
three
samples
following
three
directions:
X-direction
parallel
to
the
rolling
direction
, Y-direction
perpendicular
to
the
rolling
direction
in
the
rolling
plan
and
Z-
direction
perpendicular
to
the
plane
rolling.
The
dilatometric
results
revealed
the
presence
of
anisotropy.
The
thermal
expansion
coefficient
measurements
differ
from
one
direction
to
another
and
from
one
alloy
to
another.
We
emphasize
that
the
thermal
expansion
coefficient
along
Z direction
of
the
sheet
01
contains
a large
landing
extending
over
200
C
where
α
(T)
remains
substantially
constant
. This
feature
makes
the
material
suitable
in
the
industrial
field
.
DSC
studies
enabled
us
to
follow
the
transformation
of
the
various
phases
of
the
sequence
of
precipitation
in
these
alloys.
The
microstructure
of
the
alloys
was
characterized
by
optical
microscopy,
which
confirmed
a
significant
presence
of
thermally
stable
precipitate
at high
temperature
in
the
two
sheets.
X-ray
diffraction
stu
dy
confirms
the
positive
role
of
the
addition
of
copper
,
which
improve
s
the
mechanical
properties
of
the
material
.
Microhardness
measurements
show
that
the
excess
Si
improves
the
mechanical
properties
of
alloys
Al-Mg
-Si.
We
believe
that
the
results
obtained
in
this
work
that
required
the
use
of
additional
complementary
techniques
.
