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Studies of Co-Fe-Pd Alloys in the As-Cast Condition, and After Annealing at 1000 and 650 °C

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Abstract

Twelve samples of different compositions were produced by arc-melting, and studied in the as-cast state, and after annealing at 650, and 1000 °C, for 1000 h. All samples were analysed in an SEM with EDX spectroscopy to derive the microstructures and to determine the overall and phase compositions, and by XRD to derive the crystal structures. The as-cast microstructures mainly showed cored A1 (γFe,αCo,Pd), except for of three samples which showed A1 (γFe,αCo,Pd) + (αFe) and A1 (γFe,αCo,Pd) + ~ FePd3. Some of the phases were too fine to be analysed accurately, and some microstructures did not coarsen on annealing. Coring occurred in some samples, and remained to a lesser extent after annealing. The 1000 °C isothermal section was drawn and the system comprised mainly A1 (γFe,αCo,Pd). A miscibility gap in A1 (γFe,αCo,Pd) was identified in the 650 °C isothermal section, because there were two discrete phases, two sets of A1 peaks, and higher hardnesses. The hardness of the alloys increased with increased Fe and decreased Pd, samples with higher Co contents also had lower hardnesses, and there was a peak in the hardness at Co20:Fe60:Pd20 (at.%) in all conditions.

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Acknowledgments

The DSI and NRF of South Africa are thanked for funding the project. Mintek are thanked for providing resources and equipment to make the samples. Doctor Roy Forbes from the School of Chemistry at the University of the Witwatersrand is thanked for assistance with access and training to the XRD.

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Authors and Affiliations

  1. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg, South Africa

    K. Dyal Ukabhai & L. A. Cornish

  2. DSI-NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Johannesburg, South Africa

    K. Dyal Ukabhai, I. A. Mwamba & L. A. Cornish

  3. Advanced Materials Division, Mintek, Randburg, South Africa

    I. A. Mwamba

Authors
  1. K. Dyal Ukabhai
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  2. I. A. Mwamba
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  3. L. A. Cornish
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Correspondence to K. Dyal Ukabhai.

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This invited article is part of a special tribute issue of the Journal of Phase Equilibria and Diffusion dedicated to the memory of Günter Effenberg. The special issue was organized by Andrew Watson, Coventry University, Coventry, United Kingdom; Svitlana Iljenko, MSI, Materials Science International Services GmbH, Stuttgart, Germany; and Rainer Schmid-Fetzer, Clausthal University of Technology, Clausthal-Zellerfield, Germany.

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Dyal Ukabhai, K., Mwamba, I.A. & Cornish, L.A. Studies of Co-Fe-Pd Alloys in the As-Cast Condition, and After Annealing at 1000 and 650 °C. J. Phase Equilib. Diffus. 41, 567–585 (2020). https://doi.org/10.1007/s11669-020-00825-1

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  • DOI: https://doi.org/10.1007/s11669-020-00825-1

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