DSpace
 

Researchspace >
General science, engineering & technology >
General science, engineering & technology >
General science, engineering & technology >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3303

Title: Laser alloyed Al-Ni-Fe coatings
Authors: Pityana, SL
Rossouw, R
Keywords: Laser beams
Thin surfacing
Intermetallic phases
Iron
Nickel
X-ray diffraction
XRD
Electro-optics
ICALEO 2008
Issue Date: Oct-2008
Publisher: ICALEO 2008 Congress Proceedings
Citation: Pityana, SL and Rossouw, R. 2008. Laser alloyed Al-Ni-Fe coatings. 27th International Congress on Applications of Lasers and Electro-Optics (ICALEO 2008), Orlando, Florida, USA, 20-23 October 2008, pp 55-60
Abstract: The aim of this work was to produce crack-free thin surface layers consisting of binary (Al-Ni, Al-Fe) and ternary (Al-Ni-Fe) intermetallic phases by means of a high power laser beam. The laser surface alloying was carried out by melting Fe and Ni based powders on an aluminium substrate. The mixture of the Fe and Ni powders was varied in order to create Fe-rich and Ni-rich intermetallic phases. A Rofin 4.4 kW Nd: YAG laser was used for melting the powders and the substrate. The thin layers were analysed by menas of X-ray diffraction (XRD), optical and scanning electron microscopy (SEM). It was found that when alloying with Fe-rich mixtures, the thin surface layers contained a number of cracks in the heat affected zones (HAZ). Alloying with Ni-rich mixtures produced crack-free surface layers on the substrate. The average thickness of the layer was ~1.5mm. The XRD analyses of the alloyed layer showed a variety of intermetallic phases including Ni3Al, NiAl, FeAl, Fe3Al and Al5FeNi. The hardness of the surface layers was 3~4 times higher than that of the Al 1200 substrate
Description: 27th International Congress on Applications of Lasers and Electro-Optics (ICALEO 2008), Orlando, Florida, USA, 20-23 October 2008
URI: http://hdl.handle.net/10204/3303
ISBN: 9780912035123
Appears in Collections:Laser materials processing
Accessibility research
General science, engineering & technology

Files in This Item:

File Description SizeFormat
Pityana1_2008.pdf516.16 kBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback