IFIR 05409
INSTITUTO DE FISICA DE ROSARIO
Unidad Ejecutora - UE
artículos
Título:
Order controlled dislocations and grain boundary mobility in Fe-Al-Cr alloys
Autor/es:
O. A. LAMBRI; J. I. PÉREZ-LANDAZÁBAL; V. RECARTE; G. J. CUELLO; I. S. GOLOVIN
Revista:
JOURNAL OF ALLOYS AND COMPOUNDS
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 537 p. 117 - 122
ISSN:
0925-8388
Resumen:
The dislocations and grain boundary mobility in elastic range of loading has been analysed by means of
mechanical spectroscopy and neutron diffraction studies in Fe?25at.%Al?8at.%Cr and Fe?25at.%Al?
25at.%Cr alloys, in relation to the order degree of the structure. If the alloys are in the ordered state
(D03 or B2), the mobility of dislocations and grain boundaries is markedly reduced promoting small values
of damping. In contrast, when the ordering is suppressed by annealing at temperatures above 973 K,
the mobility of dislocations and grain boundaries increases. This leads to an increase in overall damping.
In particular, thermally activated damping peaks related to the solute grain boundary peaks due to presence
of the aluminium and chromium atoms appear within the temperature interval from 900 to 1100 K,
depending on the substitutional atomic content3 or B2), the mobility of dislocations and grain boundaries is markedly reduced promoting small values
of damping. In contrast, when the ordering is suppressed by annealing at temperatures above 973 K,
the mobility of dislocations and grain boundaries increases. This leads to an increase in overall damping.
In particular, thermally activated damping peaks related to the solute grain boundary peaks due to presence
of the aluminium and chromium atoms appear within the temperature interval from 900 to 1100 K,
depending on the substitutional atomic content
