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Laser-processing-induced phase transformation in Zn–Al-based alloy

Published online by Cambridge University Press:  31 January 2011

Y. H. Zhu ,
J. A. Chavez-Carvayar ,
H. C. Man  and
M. Villagran
Y. H. Zhu
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Mexico D.F., Mexico, and Department of Manufacturing Engineering, Hong Kong Polytechnic University, Hong Kong, People's Republic of China
J. A. Chavez-Carvayar
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Mexico D.F., Mexico
H. C. Man
Affiliation:
Department of Manufacturing Engineering, Hong Kong Polytechnic University, Hong Kong, People's Republic of China
M. Villagran
Affiliation:
Centro de Instrumentos, Universidad Nacional Autonoma de Mexico, Mexico D.F., Mexico
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Abstract

Microstructure and phase transformation of a furnace-cooled eutectoid Zn–Al-based alloy were studied after laser beam bombardment using low-angle x-ray diffraction (XRD) and backscattered scanning electron microscopy (BSEM). It was found that the microstructure of the laser-beam-treated specimen consisted mainly of the supersaturated Zn-rich β′s phase particulates of about 1−2 μm in diameter. Three structure morphologies were observed. Microcracking occurred in the laserbeam-affected zone during laser processing. Two laser-processing-induced phase transformations, i.e., decomposition of the η′FC phase and a four-phase transformation, were detected using XRD and BSEM techniques, similar to phase transformations that occurred in the same eutectoid Zn–Al-based alloy after various thermal and thermomechanical processing procedures.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 11 , November 1999 , pp. 4188 - 4194
Copyright
Copyright © Materials Research Society 1999

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