TY - JOUR
T1 - Crystallographic and Magnetic Domains in Heat-Treated Fe–N Alloy Containing α″-Fe16N2 Phase
AU - Tamaoka, Takehiro
AU - Okamoto, Satoshi
AU - Murakami, Yasukazu
N1 - Funding Information:
This work was supported in part by KAKENHI (Grant Nos. 21H04623 and 22K18904) funded by JSPS and the program for advanced research equipment platforms by MEXT (Grant No. JPMXS0450200121).
Publisher Copyright:
© 2023, ASM International.
PY - 2023
Y1 - 2023
N2 - Heat treatment of martensite in Fe–N alloy produces α″-Fe16N2 phase, which appears to show a giant magnetic flux density that exceeds the upper limit predicted by the Slater–Pauling curve. Here, we reveal the relationship between the crystallographic microstructure and the magnetic domain structure in a heat-treated Fe–N alloy. Transmission electron microscopy observations revealed a complex crystallographic microstructure in the heat-treated specimen: lamellae composed of α″-Fe16N2, α-Fe, and γ′-Fe4N phases. Electron holography was used to map the magnetic flux lines in the mixed-phase state and revealed a substantial magnetocrystalline anisotropy of the α″-Fe16N2 phase. The observations provide useful information for engineering of the α″-Fe16N2 phase.
AB - Heat treatment of martensite in Fe–N alloy produces α″-Fe16N2 phase, which appears to show a giant magnetic flux density that exceeds the upper limit predicted by the Slater–Pauling curve. Here, we reveal the relationship between the crystallographic microstructure and the magnetic domain structure in a heat-treated Fe–N alloy. Transmission electron microscopy observations revealed a complex crystallographic microstructure in the heat-treated specimen: lamellae composed of α″-Fe16N2, α-Fe, and γ′-Fe4N phases. Electron holography was used to map the magnetic flux lines in the mixed-phase state and revealed a substantial magnetocrystalline anisotropy of the α″-Fe16N2 phase. The observations provide useful information for engineering of the α″-Fe16N2 phase.
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U2 - 10.1007/s40830-023-00417-1
DO - 10.1007/s40830-023-00417-1
M3 - Article
AN - SCOPUS:85147691550
SN - 2199-384X
JO - Shape Memory and Superelasticity
JF - Shape Memory and Superelasticity
ER -