INVESTIGADORES
ARES alicia esther
artículos
Título:
ANÁLISIS DE LAS VELOCIDADES DE LAS INTERFASES DURANTE LA SOLIDIFICACIÓN DIRECCIONAL HORIZONTAL DE ALEACIONES Zn-10Al
Autor/es:
SERGIO FABIAN GUEIJMAN; ALICIA ESTHER ARES; CARLOS ENRIQUE SCHVEZOV
Revista:
REVISTA DE CIENCIA Y TECNOLOGÃA
Editorial:
CENTRO DE INVESTIGACIÓN Y DESARROLLO TECNOLÓGICO, FACULTAD DE CIENCIAS EXACTAS, QUÍMICAS Y NATURALES, UNIVERSIDAD NACIONAL DE MISIONES
Referencias:
Lugar: Posadas; Año: 2010 vol. 13 p. 13 - 24
ISSN:
0329-8922
Resumen:
The prediction of
the structures of solidification in binary alloys is important in order to
advance in the knowledge of the field itself and in the field of materials in
general. The validation and application
of the numerical models that are being developed by our group intend to contribute
to the expansion of the knowledge in the metallurgical area, since there are
few studies in the literature about the prevailing conditions in which the
columnar to equiaxed transition (CET) is produced when the conditions of
solidification are horizontal, one-directional and in two different ways of
solidification, and when the fronts of solidification of two surfaces facing
each other meet. The present study aimed
to solidify the hypereutectic Zn-10%Al (ZA10) alloy horizontally, when heat is
predominantly extracted from both extremes of the samples. This gives six
interphases of solidification moving in opposite directions (three moving from
the right side and three moving from the left): two [liquid/(solid+liquid)]
interphases, namely [L/(S+L)] or IL interphases, two
[(solid+liquid)/(eutectic+solid+liquid)] interphases, namely [(S+L)/(E+L)] or IE,
and two [(eutectic+solid+liquid)/solid] interphases, namely [(E+L)/S]
interphases or IS. The
presence of these six interphases determines that the end of the solidification
occurs next to the geometric centre of the probes and seems to be related to
the presence of holes or cavities derived from the internal subsuperficial
contraction. In this work, the speed and
accelerations of all the interphases were determined as a function of time and
position. The results obtained were compared with similar results obtained for
hypoeutectic alloys solidified in similar conditions in a previous work.