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Surface quality evaluation of hot deformed aluminum

Published online by Cambridge University Press:  22 July 2016

L.A. Espinosa Zúñiga ,
F.A. Pérez González ,
O. Zapata ,
N.F. Garza Montes de Oca  and
S. Haro
L.A. Espinosa Zúñiga*
Affiliation:
Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, UANL, AP-149F, CP-66451, Cd. Universitaria, N.L. México.
F.A. Pérez González
Affiliation:
Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, UANL, AP-149F, CP-66451, Cd. Universitaria, N.L. México.
O. Zapata
Affiliation:
Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, UANL, AP-149F, CP-66451, Cd. Universitaria, N.L. México.
N.F. Garza Montes de Oca
Affiliation:
Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, UANL, AP-149F, CP-66451, Cd. Universitaria, N.L. México.
S. Haro
Affiliation:
Unidad Académica de Ingeniería, Universidad Autónoma de Zacatecas, Av. López Velarde No. 801, Centro, C.P. 98000, Zacatecas, Zac. México.
*
*Email: [email protected]
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Abstract

The surface quality of a heat treatable Al-Si-Mg alloy by means compression tests at 450°C was evaluated. Samples were obtained from an ingot with unidirectional solidification in order to obtain a microstructural gradient influenced by the cooling and solidification rate. The samples were heat treated by homogenization at 520°C for 4 hours prior to deformation by compression. Inverted optical and scanning electron microscopes were used to assess the surface damage of deformed samples.

Analysis of deformed surface indicates a greater influence of microstructural refinement on hardening rate. It was found that the samples solidified at high cooling rates showed no defects, but at low cooling rates produced growth of grain size and intermetallic phases and thereby the high incidence of cracks in the surface.

Keywords

CastingMicrostructureFracture
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1816: Symposium 5B – Structural and Chemical Characterization of Metals, Alloys and Compounds , 2016 , imrc2015abso65
Copyright
Copyright © Materials Research Society 2016 

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References

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