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3D Quantitative Characterization of Rapidly Solidified Al-36 Wt Pct Ni

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Abstract

The rapid solidification of a peritectic alloy is studied. Various 2D and 3D characterization techniques were effectively utilized to investigate the effect of cooling rate on both the phase fractions and the shrinkage porosity. Particles of Al-36 wt pct Ni were produced using a drop tube impulse system. Neutron diffraction and Rietveld analysis were used to quantify the phases formed during solidification. The microstructure of the produced particles was analyzed using SEM and X-ray microtomography. It was found that increasing cooling rate resulted in decreasing the Al3Ni2 to Al3Ni ratio. Also, quantitative analysis of the microtomography images revealed that the volume percent of porosity increased with increasing particle size. The distribution of porosity was found to be significantly different in small and large particles. It was concluded that the extensive growth of Al3Ni2 at lower cooling rates followed by the peritectic reaction made the feeding of the shrinkages more difficult, and as a result, the volume percent of porosity increased. Other findings showed that high cooling rate during solidification would result in the formation of a quasicrystalline phase, known as D-phase, and suppression of the primary Al3Ni2. Also, investigation of the 3D structure of the solidified particles revealed that large particles of Al-36 wt pct Ni contain multiple nucleation sites, while smaller particles contain only one single nucleation site.

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Acknowledgments

We would like to thank the National Research Council of Canada-Canadian Neutron Beam Centre, (NRC-CNBC), Chalk River, ON, Canada, and Ronald Donabergerfor for their support in conducting the neutron diffraction experiments. The authors also acknowledge access to beamtime from the Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland (Proposal No. 20100178). We are grateful to the Tomcat beamline group whose outstanding efforts have made these experiments possible. We would like to thank Dr. Julie Fife for her support in setting up the beamline and data collection. The assistance and support of Dr J. Johansson, D. Thornton, and M. Kazakevich in carrying out the 3D image analysis from microtomography are also acknowledged. We are grateful for the support of the Canadian Space Agency (CSA) and the Natural Sciences and Engineering Research Council of Canada (NSERC) for this project.

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Authors and Affiliations

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

    Arash Ilbagi (Ph.D. Student, Integrity Specialist) & Hani Henein (Professor)

  2. Skystone Engineering, Calgary, AB, Canada

    Arash Ilbagi (Ph.D. Student, Integrity Specialist)

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  1. Arash Ilbagi
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  2. Hani Henein
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Correspondence to Arash Ilbagi.

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Manuscript submitted February 22, 2013.

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Ilbagi, A., Henein, H. 3D Quantitative Characterization of Rapidly Solidified Al-36 Wt Pct Ni. Metall Mater Trans A 45, 2152–2160 (2014). https://doi.org/10.1007/s11661-013-2116-x

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