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Phase quantification of impulse atomized Al68.5Ni31.5 alloy

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Abstract

Powders of Al68.5Ni31.5 were produced using the impulse atomization technique. The molten droplets were cooled in-flight by the stagnant helium or nitrogen in the atomizing chamber, and the resulting powders were sieved into different size ranges. Scanning electron microscopy, X-ray diffraction, and neutron diffraction were used in order to study the microstructure and to quantify the phase fractions in the samples. The computer software GSAS was used to calculate the weight fraction of the existing phases, namely Al3Ni2, Al3Ni, and Al, by the profile refinement method. X-ray micro-tomography and optical microscopy were used to study the porosity formation inside the particles. It was found that for particles having sizes decreasing from 925 to 256 μm (increasing cooling rate), the weight fraction of Al3Ni and eutectic Al decreases while that of Al3Ni2 increases. Furthermore, the droplets formed at higher cooling rates yielded a lower volume fraction of porosity.

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Acknowledgements

This research was supported by Canadian Space Agency (CSA) and by Natural Sciences and Engineering Research Council of Canada (NSERC). The authors would like to thank Atomic Energy Canada Limited (AECL), Chalk River, and Oak Ridge National Laboratory (ORNL), TN, USA, for their support in conducting the neutron diffraction experiments. We would also like to acknowledge The Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland, and European Synchrotron Radiation Facility (ESRF) in Grenoble, France for beam time. The authors are grateful to Guillaume Reinhart for conducting micro-tomography experiments. We are also thankful to Ian Swainson, Ulf Dahlborg and Monique Calvo-Dahlborg for their assistance in data analysis.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, T6G 2G6, Canada

    A. Ilbagi & H. Henein

  2. School of Engineering, The University of British Columbia, Kelowna, BC, V1V 1V7, Canada

    A. B. Phillion

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  1. A. Ilbagi
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  2. H. Henein
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  3. A. B. Phillion
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Correspondence to A. Ilbagi.

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Ilbagi, A., Henein, H. & Phillion, A.B. Phase quantification of impulse atomized Al68.5Ni31.5 alloy. J Mater Sci 46, 6235–6242 (2011). https://doi.org/10.1007/s10853-010-4972-8

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  • DOI: https://doi.org/10.1007/s10853-010-4972-8

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