L1₀ Ordering in MnAl and FeNi Influenced by Magnetic Field and Strain

Journal Article · 22 July 2023 · Microscopy and Microanalysis

DOI: https://doi.org/10.1093/micmic/ozad067.690 · OSTI ID:1999594

Han, Chaoya ^[1]; Lejeune, Brian ^[2]; Zhang, Xiaoyu ^[2]; Ni, Chaoying ^[1]; Lewis, Laura H. ^[2]

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1. University of Delaware, Newark, DE (United States)
2. Northeastern University, Boston, MA (United States)

Due to various materials supply chain challenges, magnets free of constrained elements are attracting increasing interest. Magnetic materials such as rare-earth free FeNi and MnAl have been receiving considerable attention due to the high magnetocrystalline anisotropy and other associated magnetic properties derived from their unique chemically ordered tetragonal crystal structure, denoted as the L1₀ structure. However, synthesis of L1₀ FeNi has had limited success due to the extremely low atomic mobilities of Fe and Ni. In this work, isostructural MnAl was first studied as proxy to understand the L1₀ ordering process. Here, evidence of L1₀ ordering in FeNi derived from TEM studies is presented, where ordering was facilitated by the application of strain and magnetic field provided during thermal treatment of a severely plastically deformed FeNi alloy.

• Research Organization: Univ. of Delaware, Newark, DE (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0022168
• OSTI ID: 1999594
• Journal Information: Microscopy and Microanalysis, Vol. 29, Issue Supplement_1; ISSN 1431-9276
• Publisher: Microscopy Society of America (MSA)Copyright Statement
• Country of Publication: United States
• Language: English