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Structural analysis and densification study of the mechanically alloyed Cr50Ni50 powders

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Abstract

Nanocrystalline Cr50Ni50 material was obtained by high-energy ball milling from pure Cr and Ni powders in a planetary ball-mill P7 under argon atmosphere at ambient temperature. Microstructural, structural, morphological, magnetic, and densification properties were studied by X-ray diffraction, scanning electron microscopy, magnetic measurements, and cold compaction followed by sintering. The Rietveld refinement of the X-ray diffraction pattern reveals after 1 h of milling the formation of the disordered fcc-Ni (Cr) solid solution in addition to pure Cr and Ni. After 25 h of milling, the interdiffusion between Cr and Ni atoms leads to the formation of a mixture of disordered fcc-Ni(Cr) and bcc-Cr(Ni) solid solutions. The average thickness of the grain boundaries <EJ > of bcc-Cr(Ni) and fcc-Ni(Cr) is of about 3.5 and 2.3 nm, respectively. The morphological observations reveal the fragile aspect of the powder particles which is explained by their fragmentation at different stages of the milling process. The existence of small magnetic particles which are typically single domains is evidenced by Mr/Ms (0.1–0.5) values. The porosity fraction of the cold compacted powders is about 25% then decreases to about 12% after sintering at 1250 °C for 2 h. The Vickers microhardness values of the milled powders for 25 h evolute from 1045 to 1280 Hv while those of the sintered powders vary in the range 716 to 995 Hv.

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Acknowledgments

This research work was supported by the DGRSDT/PNR project, 2011 (MESRS) Algeria. The authors are very grateful to Jean-Marc Grenèche from Laboratoire de Physique de l’état condensé, Université du Maine, France, for technical resources and to Kahloul Latifa from Ecole Nationale Supérieure des Mines et Métallurgie, Annaba, Algérie for EDS characterization.

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Authors and Affiliations

  1. Laboratoire de Mise en forme des Matériaux Métalliques (LMF2M), Département de Métallurgie et Génie des Matériaux, Faculté des Sciences de l’Ingéniorat, Université Badji-Mokhtar, B.P.12, 23000, Annaba, Algeria

    L. Dekhil

  2. Laboratoire de Physique de l’état condensé-UMR6087, Université du Maine, Faculté des Sciences, 72085, Le Mans Cedex 9, France

    N. Hanneche & A. M. Mercier

  3. Mechanical Engineering Department, Abbes Laghrour University, P. O 1252, 40004, Khenchela, Algeria

    M. Fellah

  4. Department of Physic, College of Science, University of Bahrain, PO Box 32038, Zallaq, Kingdom of Bahrain

    M. Bououdina

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  1. L. Dekhil
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  3. M. Fellah
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Correspondence to L. Dekhil.

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Dekhil, L., Hanneche, N., Fellah, M. et al. Structural analysis and densification study of the mechanically alloyed Cr50Ni50 powders. Int J Adv Manuf Technol 108, 2515–2524 (2020). https://doi.org/10.1007/s00170-020-05504-6

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