Journal
MATERIALS TRANSACTIONS
Volume 60, Issue 6, Pages 1066-1071Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.M2019019
Keywords
iron-nickel; iron nitride; magnets; leaching; dealloying; precious metal replacement
Funding
- Izumi Science and Technology Foundation
- JSPS KAKENHI [17K14829]
- Frontier Research Institute for Interdisciplinary Sciences of Tohoku University
- Grants-in-Aid for Scientific Research [17K14829] Funding Source: KAKEN
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L1(0)-type FeNi alloys and alpha ''-Fe16N2 are candidates for permanent magnets without precious metals, but they are difficult to prepare because atomic diffusion is extremely slow below the order-disorder transition temperature of L1(0)-FeNi (320 degrees C) and because alpha ''-Fe16N2 is a metastable phase. Here, we report trials for preparing them using leaching, which is a method to obtain porous metals with a high surface area. We used such chemically active porous alloys as precursors for preparing L1(0)-FeNi using the driving force of atomic diffusion and for preparing alpha ''-Fe16N2 using high reactivity with ammonia. No proofs for obtaining the L1(0)-FeNi phase were observed, likely due to an Al impurity of 10 mol% and/or too small of a grain size. An Fe16N2 with alpha '' phase was obtained. Although the saturation magnetization was smaller than that of Fe, a large coercivity (up to 121 kAm(-1)) was obtained.
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