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New AlNiCo Magnets Fabricated From Pre-Alloyed Gas-Atomized Powder Through Diverse Consolidation Techniques

TitleNew AlNiCo Magnets Fabricated From Pre-Alloyed Gas-Atomized Powder Through Diverse Consolidation Techniques
Publication TypeJournal Article
Year of Publication2015
AuthorsTang, W, Zhou, L, Kassen, AG, Palasyuk, A, White, EM, Dennis, KW, Kramer, MJ, McCallum, RW, Anderson, IE
JournalIeee Transactions on Magnetics
Volume51
Pagination2101903
Date Published11
Type of ArticleArticle; Proceedings Paper
ISBN Number0018-9464
Accession NumberWOS:000364770500103
KeywordsAlnico permanent magnets, gas-atomized powder, hot pressing (HP), Magnetic properties, sintering
Abstract

Fine Alnico 8 spherical powder produced by gas atomization was consolidated through hot pressing (HP), hot isostatic pressing (HIP), and compression molding and subsequent sintering (CMS) techniques. The effects of different fabrication techniques and processing parameters on microstructure and magnetic properties were analyzed and compared. The HP, HIP, and CMS magnets exhibited different features in microstructures and magnetic properties. Magnetically annealed at 840 degrees C for 10 min and subsequently tempered at 650 degrees C for 5 h and 580 degrees C for 15 h, the HIP sample achieved the best coercivity (H-cj = 1845 Oe) due to spinodally decomposed (SD) phases with uniform and well-faceted mosaic morphology. The CMS sample had a lower Hcj than HIP and HP samples, but a higher remanence and thus the best energy product (6.5 MGOe) due to preferential grain alignment induced by abnormal grain growth.

DOI10.1109/tmag.2015.2437355
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