Preparation of α′-Fe(N)/α′-Fe8N by γ′-Fe4N precursor

Bin Ma, Guannan Guo, Jinming Liu, Fan Zhang, Jian Ping Wang

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An approach by using the γ′-Fe4N precursor was proposed to prepare a bulk magnet with high α″-Fe16N2 content, and the feasibility for high N content α′-Fe(N)/α′-Fe8N was demonstrated in ribbon samples. γ′-Fe4N decomposed when it was heated to a high temperature, and then, a supersaturated γ-Fe(N) phase formed because of N atoms diffusing out from the γ′-Fe4N lattice. The short-lived supersaturated γ-Fe(N) had the face-centered cubic lattice, and its nitrogen content is beyond 3.0 wt. %. The supersaturated γ-Fe(N) acts as a precursor of the martensite transformation for a body-centered tetragonal phase. After the cryo-treatment, which was essential to complete the martensite transformation, a mixture of α′-Fe(N) and α′-Fe8N was obtained. The N content of more than 2.5 wt. % in the samples was achieved.

Original languageEnglish (US)
Article number075218
JournalAIP Advances
Issue number7
StatePublished - Jul 1 2022

Bibliographical note

Funding Information:
The work was partially sponsored by Niron Magnetics, Inc. We are grateful to Dr. Yiming Wu, Dr. John Larson, Dr. Frank Johnson, and technicians for their assistance in arranging nitrogenizing some samples using Niron facilities based on our pretreated Fe–Cu–B ribbons as input precursors and our proposed specific processing recipes.

Funding Information:
Part of this work was carried out by the help of Dr. Javier Garcia Barriocanal, in the Characterization Facility, the University of Minnesota, which receives partial support from NSF through the MRSEC program. We also thank the partial support in VSM measurements from the Institute of Rock Magnetism.

Publisher Copyright:
© 2022 Author(s).


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