Campus Units

Materials Science and Engineering, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

9-1-2020

Journal or Book Title

Acta Materialia

Volume

196

First Page

528

Last Page

538

DOI

10.1016/j.actamat.2020.06.058

Abstract

Samarium-cobalt alloys are used in some of the strongest permanent magnets, particularly for applications between about 200 and 550°C, but the utilization of these materials is restricted by their brittleness. Improving their mechanical resilience would allow them to be used more widely and, in some cases, substitute for neodymium-based magnet alloys which are subject to supply-chain risks. We have engineered a series of novel microstructures with bi-modal grain size distributions to achieve unprecedented combinations of mechanical and magnetic properties. Improvements up to 73% are obtained in the flexural strength of Sm2(CoFeCuZr)17 sintered magnets, with negligible impact on the magnetic properties. Our mechanically-robust, high-performance Sm-Co magnets are made without changing the chemical compositions of the materials or their heat treatment procedures, making them highly compatible with existing manufacturing processes.

Comments

This is a manuscript of an article published as Cui, Baozhi, Xubo Liu, Alexander H. King, Gaoyuan Ouyang, Cajetan I. Nlebedim, and Jun Cui. "Overcoming Mechanical Fragility in Sm-Co Permanent Magnet Materials." Acta Materialia 196 (2020): 528-538. DOI: 10.1016/j.actamat.2020.06.058. Posted with permission.

Copyright Owner

Acta Materialia Inc.

Language

en

File Format

application/pdf

Available for download on Sunday, July 03, 2022

Published Version

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