INVESTIGADORES
SCHVEZOV Carlos Enrique
congresos y reuniones científicas
Título:
The effect of foreign particles on the interface shape during solidification of crystals
Autor/es:
ELIANA MABEL AGALIOTIS; MARIO ROBERTO ROSENBERGER; ALICIA E. ARES; CARLOS E. SCHVEZOV
Lugar:
Madrid
Reunión:
Congreso; XXII IUCr Congress; 2011
Institución organizadora:
IUCr
Resumen:
The shape of a solidifying interface is generally affected when it
encounters foreign inert particles. The degree of deformation depends
on the morphology and physical properties of the particles [1-4]. The
overall effect also affects the pushing and captures process, when
pushing is present.
In the present report the interaction between particle and interface
is analyzed by means of a mathematical model employing the finite
element method. The effect on the interface of different particle shapes
and relative thermal conductivities between particle and melt was
studied.
The results sown that for an isolating particle with respect to the
melt the interface is convex in a degree that changes depending on the particle shape and separation distance from the interface. The particle
geometries considered for simplicity were spherical, cylindrical,
conical and semi-spherical. For a conducting particle the interface
changes to concave.
From the observation of the present results the trapping of the
particles by the solid starts in different places; for a conducting particle the first points touching the solids are the corners while for an isolating particle this occurs at the particles center.
The analyses of these observations indicate that the probability of
pore formation could be higher when isolating particle are present in
the melt.
[1] A.A. Chernov, D.E. Temkin, Crystal Growth and Materials, North Holland,
Amsterdam 1977, 3-77. [2] J.K. Kim, P.K. Rohatgi, Acta mater. 1998, 46(4),
1115-l123. [3] A.V. Catalina, S. Mukherjee, D. Stefanescu, Metallurgical and
Materials Transactions 2000, A31, 2559-2568. [4] J.W. Garvin, Y. Yang, H.S.
Udaykumar, International Journal of Heat and Mass Transfer, 2007, 50, 29692980.
Keywords: Solidification