Crystallographic and Magnetic Domains in Heat-Treated Fe–N Alloy Containing α″-Fe16N2 Phase

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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.

Original languageEnglish
Pages (from-to)293-299
Number of pages7
JournalShape Memory and Superelasticity
Issue number2
Publication statusPublished - Jun 2023

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanics of Materials


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