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Influence of dendrite arm spacing on the thermal conductivity of an aluminum-silicon casting alloy

Published online by Cambridge University Press:  31 January 2011

C. Vázquez-López ,
A. Calderón ,
M. E. Rodríguez ,
E. Velasco ,
S. Cano ,
R. Colás  and
S. Valtierra
C. Vázquez-López
Affiliation:
Departamento de Física, Centro de Investigación y de Estudios Avanzados del IPN, A. P. 14-740, México, 07000, D.F., Mexico
A. Calderón
Affiliation:
Centro de Investigación en Ciencia Aplicada y Tecnologia Avanzada del IPN, Calzada Legaria No. 694, Col. Irrigación, México 11500, D.F.Mexico
M. E. Rodríguez
Affiliation:
Centro de Investigación en Ciencia Aplicada y Tecnologia Avanzada del IPN, Calzada Legaria No. 694, Col. Irrigación, México 11500, D.F.Mexico
E. Velasco
Affiliation:
Corporativo Nemak, S. A. de C. V., A. P. A-100, Monterrey, 66000, N.L.Mexico
S. Cano
Affiliation:
Corporativo Nemak, S. A. de C. V., A. P. A-100, Monterrey, 66000, N.L.Mexico
R. Colás
Affiliation:
Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, A. P. 149-F, Cd. Universitaria, San Nicolás de los Garza, 66451, N.L.Mexico
S. Valtierra
Affiliation:
Corporativo Nemak, S. A. de C. V., A. P. A-100, Monterrey, 66000, N.L.Mexico
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Extract

The photoacoustic technique and the thermal relaxation method were used to determine the thermal conductivity of some representative samples obtained from an aluminumsilicon casting alloy A319. This material was solidified with an imposed unidirectional thermal gradient to obtain samples with different microstructures characterized by the secondary dendrite arm spacing, which increases as the solidification rate decreases. It was found that the thermal conductivity of the alloy decreases with an increase in the secondary dendrite arm spacing and a decrease in the integral dendrite perimeter.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 1 , January 2000 , pp. 85 - 91
Copyright
Copyright © Materials Research Society 2000

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