TY - JOUR
T1 - Magnetic evaluation of the hardening and softening of thermally aged iron–copper alloys
AU - Vandenbossche, L.P.
AU - Konstantinovic, Milan
AU - Al Mazouzi, Abderrahim
AU - Dupre, L.R.
A2 - Scibetta, Marc
N1 - Score = 10
PY - 2007/6
Y1 - 2007/6
N2 - We evaluated the variations of the magnetic hysteretic behaviour of
Fe–1wt%Cu model alloy samples due to thermal aging and over-aging. In
these alloys, the formation and growth of Cu-precipitates during the thermal
aging process results in mechanical hardening, whereas for aging times
higher than a certain critical value, mechanical softening occurs. Magnetic
hysteretic properties such as permeability, remanence, peak value and width
of the local interaction field distribution, which is related to the Preisach
model, are measured as a function of various Cu-precipitation stages
obtained by time dependent heat treatments at 773K (500 ◦C).We found that
all magnetic parameters exhibit an extremum value for the peak hardening
sample. Furthermore, the variation of permeability, remanence, and the peak
value of the local interaction field distribution mimics the behaviour of the
reciprocal value of the yield stress as a function of aging time. These results
suggest that the magnetic domain wall movement is hindered mainly by
Cu-precipitates upon thermal aging. The peak hardening values of the
investigated magnetic parameters change by approximately 50% when
compared with the initial values. This pronounced sensitivity indicates the
potential of magnetic non-destructive evaluation for the assessment of the
hardening and softening phenomena induced by Cu-precipitation.
AB - We evaluated the variations of the magnetic hysteretic behaviour of
Fe–1wt%Cu model alloy samples due to thermal aging and over-aging. In
these alloys, the formation and growth of Cu-precipitates during the thermal
aging process results in mechanical hardening, whereas for aging times
higher than a certain critical value, mechanical softening occurs. Magnetic
hysteretic properties such as permeability, remanence, peak value and width
of the local interaction field distribution, which is related to the Preisach
model, are measured as a function of various Cu-precipitation stages
obtained by time dependent heat treatments at 773K (500 ◦C).We found that
all magnetic parameters exhibit an extremum value for the peak hardening
sample. Furthermore, the variation of permeability, remanence, and the peak
value of the local interaction field distribution mimics the behaviour of the
reciprocal value of the yield stress as a function of aging time. These results
suggest that the magnetic domain wall movement is hindered mainly by
Cu-precipitates upon thermal aging. The peak hardening values of the
investigated magnetic parameters change by approximately 50% when
compared with the initial values. This pronounced sensitivity indicates the
potential of magnetic non-destructive evaluation for the assessment of the
hardening and softening phenomena induced by Cu-precipitation.
KW - magnetisation
KW - sofftening
KW - Fe-Cu alloy
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_88171
UR - http://knowledgecentre.sckcen.be/so2/bibref/4943
U2 - 10.1088/0022-3727/40/14/003
DO - 10.1088/0022-3727/40/14/003
M3 - Article
SN - 0022-3727
VL - 40
SP - 4114
EP - 4119
JO - Journal of Physics D: Applied Physics
JF - Journal of Physics D: Applied Physics
IS - 14
ER -