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Microstructural and magnetic property evolution with different heat-treatment conditions in an alnico alloy

TitleMicrostructural and magnetic property evolution with different heat-treatment conditions in an alnico alloy
Publication TypeJournal Article
Year of Publication2017
AuthorsZhou, L, Tang, W, Ke, LQ, Guo, W, Poplawsky, JD, Anderson, IE, Kramer, MJ
JournalActa Materialia
Volume133
Pagination73-80
Date Published07
Type of ArticleArticle
ISBN Number1359-6454
Accession NumberWOS:000407413100008
Keywordsalnico, Atom-probe tomography, Materials Science, Metallurgical Engineering, microscopy, Permanent magnet, permanent-magnets, phases, Spinodal decomposition, Transmission electron
Abstract

annealing. Optimal spinodal morphology and spacing is formed within a narrow temperature and time range (similar to 840 degrees C and 10 min) during thermal-magnetic annealing (MA). The ideal morphology is a mosaic structure consisting of periodically arrayed similar to 40 nm diameter (Fe-Co)-rich rods (alpha(1) phase) embedded in an (Al-Ni)-rich (alpha(2) phase) matrix. A Cu-enriched phase with a size of similar to 3-5 nm is located at the corners of two adjacent {110} facets of the alpha(1) phase. The MA process significantly increased remanence (B-r) (similar to 40-70%) of the alloy due to biased elongation of the alpha(1) phase along the (100) crystallographic direction, which is closest in orientation to the applied magnetic field. The optimum magnetic properties of the alloy with an intrinsic coercivity (H-cj of 1845 Oe and a maximum energy product (BHmax) of 5.9 MGOe were attributed to the uniformity of the mosaic structure. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

DOI10.1016/j.actamat.2017.05.012
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