Formation of an L10 superstructure in austenite upon the α → γ transformation in the invar alloy Fe-32% Ni

Кабанова, И. Г.; Сагарадзе, В. В.; Kataeva, N. V.

doi:10.1134/s0031918x11030197

Cited by 15 publications

(14 citation statements)

References 8 publications

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“…A stereographic projection analysis has shown that between the orientations of the ε phase (ZA[121] ε ) and the α matrix (ZA ) there is satis fied an orientation relationship that consists in the parallelism of close packed planes and close packed directions belonging to them: within the accuracy of the method (±5°). Earlier [12], there were determined analogous orientation relationships (ORs) for the observed γ and α orientations: and Hence, in this case, in two types of ORs (hcp/bcc and fcc/bcc) the same planes and directions of the α phase take part, and we observe the common relationship for the three phases simultaneously. Note also that the line ( ) Intensity, arb.…”

Section: Formation Of the ε Phase With An Hcp Latticesupporting

confidence: 58%

“…Figure 1a demonstrates a selected area diffraction (SAED) pattern from the sample of the Fe-32% Ni alloy after the α-γ transformation with a slow heating to 430°С (similarly to what was done in [12]), which contains a superlattice reflection indicating an ordering of the austenite being formed. The solid and dashed lines in this SAED pattern indicate networks of reflections of the α matrix and the γ phase with the zone axes and , respectively.…”

Section: Formation Of the ε Phase With An Hcp Latticementioning

confidence: 96%

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Detection of the ɛ phase and the Headley-Brooks orientation relationships upon α → γ transformation in the Fe-32% Ni alloy

Кабанова

Сагарадзе

Kataeva

et al. 2011

Phys. Metals Metallogr.

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The structure of an Fe-32% Ni alloy preliminarily quenched for martensite and subjected to α → γ transformation upon a slow heating to different temperatures (430-500°C) has been studied by the electron microscopic method. There has been observed an intermediate ε phase with an hcp lattice and rarely encountered Headley-Brooks bcc/fcc orientation relationships, which differ from the Kurdjumov-Sachs rela tionships. The networks of reflections of the ε phase have been observed in electron diffraction patterns of the Fe-32% Ni alloy after both a slow heating to 430°C without annealing and a slow heating to 500°C with a subsequent annealing at 280°C; the Headley-Brooks relationships between the α matrix and the γ phase, which are typical for increased temperatures of phase transformations, have been observed in the samples after a slow heating to 500°C with annealing.

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Section: Formation Of the ε Phase With An Hcp Latticesupporting

confidence: 58%

Section: Formation Of the ε Phase With An Hcp Latticementioning

confidence: 96%

Detection of the ɛ phase and the Headley-Brooks orientation relationships upon α → γ transformation in the Fe-32% Ni alloy

Кабанова

Сагарадзе

Kataeva

et al. 2011

Phys. Metals Metallogr.

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“…These features make it very difficult to produce in the laboratory. However, ternary phase diagrams such as Fe-Ni-S [39] and processing experiments where tetrataenite forms in laboratory time scales [40] indicate that FeNi may be formed more rapidly. In particular, attainment of the chemically-ordered -type FeNi phase may be facilitated by the introduction of the lattice vacancies and/or alloying additions that provide phase stabilization.…”

Section: Transition-metal-substituted Feni (Tetrataenite)mentioning

confidence: 99%

Intrinsic Properties of Fe-Substituted $L1_{0}$ Magnets

et al. 2013

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First-principle supercell calculations are used to determine how elemental additions, especially Fe additions, modify the magnetization, exchange and anisotropy of -ordered ferromagnets. Calculations are performed using the VASP code and partially involve configurational averaging over site disorder. Three isostructural systems are investigated: Fe-Co-Pt, Mn-Al-Fe, and transition metal-doped Fe-Ni. In all three systems the iron strongly influences the magnetic properties of these compounds, but the specific effect depends on the host. In CoPt(Fe) iron enhances the magnetization, with subtle changes in the magnetic moments that depend on the distribution of the Fe and Co atoms. The addition of Fe to MnAl is detrimental to the magnetization, because it creates antiferromagnetic exchange interactions, but it enhances the magnetic anisotropy. The replacement of 50% of Mn by Fe in enhances the anisotropy from 1.77 to 2.5 . Further, the substitution of light elements such as Ti, V, Cr into -ordered FeNi is shown to substantially reduce the magnetization.

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“…The ferromagnetic equiatomic FeNi alloy with a face-centered tetragonal (fct) L1 0 -type structure, also known as tetrataenite , is a promising candidate for the replacement of high-anisotropy magnetic materials containing rare-earths and critical elements 1 – 5 due to its excellent intrinsic magnetic properties, such as large saturation magnetization (~1.6 T), high uniaxial magneto-crystalline anisotropy (MCA~1 MJ/m 3 ), fairly high Curie temperature (up to 550 °C) and low magnetization damping constant 6 – 8 . The fabrication of the L1 0 -FeNi phase is extremely challenging due to the low atomic mobility below the chemical order/disorder transition temperature (~320 °C) 9 that kinetically limits the formation of the L1 0 phase. This FeNi phase is naturally found in meteorites, where it forms over millions of years in extreme temperature/pressure conditions 6 .…”

Section: Introductionmentioning

confidence: 99%

L10-FeNi films on Au-Cu-Ni buffer-layer: a high-throughput combinatorial study

Giannopoulos

Barucca

Kaidatzis

et al. 2018

Sci Rep

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The fct L10-FeNi alloy is a promising candidate for the development of high performance critical-elements-free magnetic materials. Among the different materials, the Au-Cu-Ni alloy has resulted very promising; however, a detailed investigation of the effect of the buffer-layer composition on the formation of the hard FeNi phase is still missing. To accelerate the search of the best Au-Cu-Ni composition, a combinatorial approach based on High-Throughput (HT) experimental methods has been exploited in this paper. HT magnetic characterization methods revealed the presence of a hard magnetic phase with an out-of-plane easy-axis, whose coercivity increases from 0.49 kOe up to 1.30 kOe as the Au content of the Cu-Au-Ni buffer-layer decreases. Similarly, the out-of-plane magneto-crystalline anisotropy energy density increases from 0.12 to 0.35 MJ/m3. This anisotropy is attributed to the partial formation of the L10 FeNi phase induced by the buffer-layer. In the range of compositions we investigated, the buffer-layer structure does not change significantly and the modulation of the magnetic properties with the Au content in the combinatorial layer is mainly related to the different nature and extent of interlayer diffusion processes, which have a great impact on the formation and order degree of the L10 FeNi phase.

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Formation of an L10 superstructure in austenite upon the α → γ transformation in the invar alloy Fe-32% Ni

Cited by 15 publications

References 8 publications

Detection of the ɛ phase and the Headley-Brooks orientation relationships upon α → γ transformation in the Fe-32% Ni alloy

Detection of the ɛ phase and the Headley-Brooks orientation relationships upon α → γ transformation in the Fe-32% Ni alloy

Intrinsic Properties of Fe-Substituted $L1_{0}$ Magnets

L10-FeNi films on Au-Cu-Ni buffer-layer: a high-throughput combinatorial study

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