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Laser deposition of a Cu-based metallic glass powder on a Zr-based glass substrate

Published online by Cambridge University Press:  31 January 2011

H. Sun  and
K.M. Flores
H. Sun
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
K.M. Flores*
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
*
a)Address all correspondence to this author. e-mail: flores.70@osu.edu
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Abstract

Laser Engineered Net Shaping (LENS™) is a laser-assisted manufacturing process that offers the possibility of producing metallic coatings and components with highly nonequilibrium microstructures. In this work, the microstructure developed by LENS deposition of Cu47Ti33Zr11Ni8Si1 powder on a bulk metallic glass substrate, with nominal composition Zr58.5Nb2.8Cu15.6Ni12.8Al10.3, is investigated. Single-layer deposition results in the formation of an inhomogeneous but partially amorphous layer above a crystalline heat-affected zone. Elemental analysis of the deposited layer indicates incomplete mixing of the powder with the melt pool. The as-deposited alloy exhibits a single glass transition event and its primary crystallization event is consistent with the first crystallization temperature of the Cu-based powder. Subsequent remelting of this layer results in a still partially amorphous deposit with a uniform composition of (Zr + Nb)51.8Cu24.7Ti3.4Ni16.4Al3.7. The remelted layer exhibits a structural rearrangement immediately prior to the primary crystallization event, possibly associated with the formation of a quasicrystalline phase.

Keywords

AmorphousLaserMetal
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 10 , October 2008 , pp. 2692 - 2703
Copyright
Copyright © Materials Research Society 2008

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