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Amorphous Phase Formation Analysis of Rapidly Solidified CoCr Droplets

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Abstract

This paper investigates amorphous phase formation and rapid solidification characteristics of a CoCr alloy. High cooling rate and high undercooling-induced rapid solidification of the alloy was achieved by impulse atomization in helium atmosphere. Two atomization experiments were carried out to generate powders of a wide size range from liquid CoCr at two different temperatures. Amorphous fraction and kinetic crystallization properties of impulse atomized powders were systematically quantified by means of differential scanning calorimetry. In addition, different but complementary characterization tools were used to analyze the powders microstructures. The fraction of amorphous phase within the investigated powders is found to be promoted by high cooling rate or smaller powder size. The critical cooling rate for amorphous phase formation, which is influenced by the oxygen content in the melt, is found to be ~3 × 104 K s−1 and corresponds to a 160-µm-diameter powder atomized in helium. Hardness of the powders is found to follow a trend that is described by the Hall–Petch relation when a relatively high fraction of crystalline structures is present and decreases with the fraction of amorphous phase.

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Acknowledgments

The authors are grateful to the Natural Sciences and Engineering Research Council of Canada (NSERC), KENNAMETAL Inc., and RIEM-NSERC Grant for the collaboration with CanmetMATERIALS.

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Authors and Affiliations

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

    Abdoul-Aziz Bogno (Postdoctoral Fellow), Carlos Riveros (Undergraduate Student) & Hani Henein (Professor)

  2. CanmetMATERIALS, Natural Resources Canada, Hamilton, ON, Canada

    Delin Li (Research Scientist)

Authors
  1. Abdoul-Aziz Bogno
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  2. Carlos Riveros
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  3. Hani Henein
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  4. Delin Li
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Corresponding author

Correspondence to Abdoul-Aziz Bogno.

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©Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources, 2016.

Manuscript submitted October 31, 2015.

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Bogno, AA., Riveros, C., Henein, H. et al. Amorphous Phase Formation Analysis of Rapidly Solidified CoCr Droplets. Metall Mater Trans B 47, 3257–3265 (2016). https://doi.org/10.1007/s11663-016-0635-8

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  • DOI: https://doi.org/10.1007/s11663-016-0635-8

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