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Non-Equilibrium Containerless Solidification of Al-Ni Alloys Open Access


Other title
Rapid solidification
Cooling rate
Rietveld analysis
Type of item
Degree grantor
University of Alberta
Author or creator
Supervisor and department
Examining committee member and department
Matson,Douglas (Tufts University, Mechanical Engineering)
Ivey,Douglas (Chemical and Materials Engineering)
Chen,Weixing (Chemical and Materials Engineering)
Herd,Christopher (Earth and Atmospheric Sciences)
Department of Chemical and Materials Engineering
Materials Engineering
Date accepted
Graduation date
Doctor of Philosophy
Degree level
More than 90% of all metallic materials are manufactured starting from their liquid state. Designing the solid structure produced during solidification can have major savings in downstream processing. Rapid solidification yields significant enhancement in properties through refined microstructure, reduced microsegregation and the formation of metastable phases. To control the microstructure obtained from rapid solidification and attain desired properties, understanding of effects of processing parameters, in particular cooling rate and undercooling on microstructure evolution is required. In the case of peritectic reaction this understanding is lacking. In this dissertation, the effect of cooling rate on the peritectic reactions occurring in the binary Al-Ni system is investigated. Impulse Atomization technique was used to produce rapidly solidified particles of Al-36 wt%Ni and Al-50wt%Ni. The effect of cooling rate on the microstructure evolution and phase fractions achieved after solidification was studied. Also, porosity formation in the atomized particles was investigated and the effect of processing parameters on the amount and distribution of porosity was analyzed. For characterization, neutron diffraction, X-ray micro-tomography, electron and optical microscopy were utilized. The results showed that in both Al-36 wt%Ni and Al-50 wt%Ni, cooling rate has a significant effect on the formation of microstructure, phase fractions and metastable phase formation. It was shown that at different cooling rate regimes different mechanisms are responsible for the changes observed in the phase fractions. Using X-Ray tomography, multiple nucleation sites were observed in large particles, while smaller particles contained only a single nucleation site. Also, porosity within the particles was quantified and the distribution of porosity with regard to the nucleation site and cooling rate is discussed. The distribution of porosity within the small particles and large particles was found to be significantly different. Quantitative analysis of the micro-tomography images revealed that the volume percent of porosity decreased with increasing cooling rate. Also, it was found that for higher cooling rates, porosity tends to form closer to the periphery of the particles, whereas at lower cooling rates the pores are more randomly distributed.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
H. Henein, A. Ilbagi and Ch.-A. Gandin, “Quantitative analysis of alloy structures solidified under limited diffusion conditions”, in Contairnerless Unidercooling of Drople and Droples. Edited by D.M. Herlach and D. M. Matson, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, ISBN 978-3-527-33122-2.A. Ilbagi, P. Delshad Khatibi, I. P. Swainson, G. Reinhart and H. Henein, "Microstructural analysis of rapidly solidified aluminium-nickel alloys", Canadian Metallurgical Quarterly, Vol. 50, No. 3, 2011, 295-302.A. Ilbagi, H. Henein and A. B. Phillion "Phase Quantification of Impulse Atomized Al68.5Ni31.5 Alloy", Journal of Materials Science, (2011) 46:6235–6242A. Ilbagi, P. Delshad Khatibi and H. Henein, "Effect of cooling rate on solidification of Al-Ni alloys", J. Phys: Conf. Ser. 327 012010.

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