Thermal effect on structural and magnetic properties of Fe 78 B 13 Si annealed amorphous ribbons 9
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Date
2017
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Abstract
In the present work, we study the influence of thermal treatments
on the magnetic properties of as-quenched and pre-crystallized Fe
after stress relaxation. The crystallization behavior of amorphous and treated
Fe
78
Si
9
B
ribbons was revisited. The measurements were carried out by
means of Differential Scanning Calorimetry, by X-ray diffraction and by
Vibrating Sample Magnetometer, Susceptometer and fluxmeter. Relaxed
samples were heated in the resistivity device up to 700°C and annealed near
the onset temperature about 420°C for respectively 1, 3, 5, 8 hours. In asquenched
samples,
two
transition
points
occur
at
about
505°C
and
564°C
but
in
relaxed
sample,
the
transition
points
have
been
found
about
552°C
and
568°C.
Kinetics
of
crystallization
was
deduced
for
all
studied
samples.
Annealing
of
the
as-purchased
ribbon
shows
the
occurrence
of
-Fe
and
tetragonal
Fe
13
B resulting from the crystallization of the remaining
amorphous phase. The effects on magnetic properties were pointed out by
3
relating the structural evolution of the samples. The magnetic measurements
show that annealing change the saturation magnetization and the coercive
magnetic field values, hence destroying the good magnetic properties of the
material. The heat treatment shows that the crystallization has greatly
altered the shape of the cycles and moved the magnetic saturation point of
the samples. The effect of treatment on the magneto-crystalline anisotropy is
also demonstrated.