Microstructural And Tribological Observations
In Metallic Glass Forming Alloy Layers Produced
By High-power Lasers
Author(s)
D. T. A. Matthews, V. Ocelík & J. Th. M. De Hosson
Abstract
Layers of Cu-based metallic glass forming compositions have been produced
using high-power lasers. Laser surface remelting and laser cladding techniques
provide sufficient cooling rates to form amorphous individual laser tracks and
even coatings. The layers have been characterised by SEM, TEM, confocal and
optical microscopy which have shown the layers may be fully amorphous, or
(nano)crystalline. Hardness testing reveals that high hardness values are
attainable for the layers (> 700 HV). Shear banding is found to be initiated
during indentation testing. The processing of laser remelted layers developed
from initial cladding has been analyzed and parameters are outlined which
govern layer thickness, track width and ultimately the microstructural appearance
of the layers.
Keywords: laser cladding, amorphous, hardness, friction.
1 Introduction
The formation of surface layers exhibiting differing mechanical properties to
their substrate is now a well documented engineering sphere. Advanced coatings
are continually being proposed and explored, which also require new processing
routes, such as laser cladding, which is still in its relative infancy, particularly
with respect to industrial applications on a large scale. Amorphous, amorphous
matrix or nanocomposite coatings are one particularly interesting breed of
surface modifications since they have been found to exhibit both extreme
hardness and toughness [1]. Their application has somewhat been limited to thin,
deposited, layers however, which often means that coating adhesion is limited.
Keywords
laser cladding, amorphous, hardness, friction.
Related Book
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