γ‐Brasses with Spontaneous Magnetization: Atom Site Preferences and Magnetism in the Fe‐Zn and Fe‐Pd‐Zn Phase Spaces

Xie, Weiwei; Liu, Jing; Pecharsky, V. K.; Miller, Gordon J.

doi:10.1002/zaac.201400539

Cited by 20 publications

(5 citation statements)

References 30 publications

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“…Based on the OD ment made in the past by four research groups in the Fe and Zn occupancy behaviors especially for the central site of these (Zn,Fe) 12 icosahedra. While exclusive occupancy by Zn atoms was claimed by Johansson et al, 28) exclusive occupancy by Fe atoms was claimed by Brandon et al, 29) Belin et al, 33) and Xie et al 50) Our results of crystal structure refinement of the Γ phase compounds with some different chemical compositions by synchrotron X-ray diffraction have indicated that the central site of (Zn,Fe) 12 icosahedra is occupied exclusively by an Fe atom regardless of chemical compositions (Fig. 9).…”

Section: δ 1p Phase (Fe 13 Zn 126 )supporting

confidence: 48%

Crystal Structures and Mechanical Properties of Fe–Zn Intermetallic Compounds Formed in the Coating Layer of Galvannealed Steels

2018

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The crystal structures of all intermetallics of the Fe-Zn system have been investigated by synchrotron X-ray diffraction combined with atomic-resolution scanning transmission electron microscopy, in order to elucidate a basic principle based on which these crystal structures are constructed. The plastic deformation behavior of all these Fe-Zn intermetallics have also been investigated by micropillar compression testing at room temperature, with the use of small-scale pillar specimens of micrometer size, in order to elucidate operative slip systems and their critical resolved shear stress values. The observed deformation behavior is discussed in the light of the deduced building principle of the crystal structures.

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Section: δ 1p Phase (Fe 13 Zn 126 )supporting

confidence: 48%

Crystal Structures and Mechanical Properties of Fe–Zn Intermetallic Compounds Formed in the Coating Layer of Galvannealed Steels

2018

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“…Because the ¡-Fe(Zn) phase has a body-centered cubic structure and contains more than 50 at% of Fe, it is assumed to be soft magnetic, while the !-FeZn phase is nonmagnetic at room temperature. 32) Moreover, in Fig. 10(c), a ring-like pattern is observed (indicated by the red arrow), which suggests presence of an amorphous or fine nanocrystalline phase in addition to ¡-Fe(Zn) in the Zn-diffused phase.…”

Section: Resultsmentioning

confidence: 92%

Fabrication of High-Density Zn-Bonded Sm–Fe–N Bulk Magnets via High-Velocity Compaction

et al. 2021

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High-velocity compaction (HVC) using a die was investigated as a compaction technique for the fabrication of high-density isotropic Znbonded SmFeN bulk magnets. The compaction characteristics of Zn-mixed SmFeN powders obtained by HVC were investigated while varying the Zn content. Moreover, the magnetic properties, flexural strengths (•), and microstructures of the resulting magnets were studied. The relative density (d r ) steadily increased with the piston velocity during compaction and reached approximately 90% at a piston velocity of 11.2 m•s ¹1 (equivalent to a compaction pressure of 3.45 GPa), regardless of the Zn content. Because the magnets were fabricated using a die, they also had a high dimensional precision. The resulting magnet, with 5 wt% Zn and d r of 89.1%, exhibited a maximum energy product ((BH ) Max ) of 54.4 kJ•m ¹3 , remanence (B r ) of 0.56 T, and coercivity (H cJ ) of 965 kA•m ¹1 . • exceeded 100 MPa when d r was above 88%, which satisfies the required mechanical strength for applications such as permanent magnet motors.

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“…Because the ¥-FeZn phase was non-magnetic, 44) the soft magnetic ¡-FeZn phase was thought to be magnetically isolated from hard magnetic Sm 2 Fe 17 N 3 phase resulting in high coercivity even though there was a knick in hysteresis loop. 24,25)…”

Section: Phase and Microstructural Changesmentioning

confidence: 99%

Microstructural Changes during Interfacial Diffusion at the Sm<sub>2</sub>Fe<sub>17</sub>–Zn Interface

et al. 2022

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The microstructural changes and interdiffusion coefficients at the Sm 2 Fe 17 Zn interface were investigated in this study. Sm 2 Fe 17 Zn diffusion couples were annealed for 10 min at 320, 350, and 400°C, which are below the melting temperature of Zn (419°C), resulting in the interdiffusion of Zn, Fe, and Sm. At the interface annealed at 400°C, three diffusion regions were identified between the Sm 2 Fe 17 and Zn phases. The thickest region was a Zn-rich region composed of polycrystalline ¤and ¦-ZnFe binary alloy phases and a ThMn 12 -type Sm(Zn,Fe) 12 ternary alloy phase. The annealing time dependence of the thickness of the Zn-rich region at 400°C was measured, and the interdiffusion coefficient was evaluated as 7.3 © 10 ¹13 m 2 s ¹1 using the EinsteinSmoluchowski equation. At the surface of the Sm 2 Fe 17 phase, a region with a fiber-like microstructure was observed that consisted of two phases, ¡-(Zn,Fe) and Sm(Zn,Fe) 12 . Interestingly, these two phases exhibited a specific crystal orientational relationship of ¡-FeZn(10-1)[111]//Sm(Zn,Fe) 12 (01-1) [011]. Between these two diffusion regions, a third region composed of nanosized polycrystalline grains of ¥-FeZn, ¡-FeZn, and Sm(Zn,Fe) 12 was observed.The temperature dependence of the microstructural changes at the Sm 2 Fe 17 Zn interface indicated that the microstructural changes proceed as follows. In the initial stage of diffusion, interdiffusion of Zn, Fe, and Sm lead to the formation of the Zn-rich region. As the interdiffusion progresses, Zn diffuses into the Sm 2 Fe 17 phase, which decomposes to Sm(Zn,Fe) 12 and ¡-FeZn phases with a fiber-like microstructure. Upon further Zn diffusion into the fiber-like region, Zn reacts with the ¡-FeZn phase to generate a polycrystalline region composed of ¥-FeZn, ¡-FeZn, and Sm(Zn,Fe) 12 phases. To the best our knowledge, this is the first paper to report on the interdiffusion and detailed microstructural changes at the Sm 2 Fe 17 Zn interface.

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γ‐Brasses with Spontaneous Magnetization: Atom Site Preferences and Magnetism in the Fe‐Zn and Fe‐Pd‐Zn Phase Spaces

Cited by 20 publications

References 30 publications

Crystal Structures and Mechanical Properties of Fe–Zn Intermetallic Compounds Formed in the Coating Layer of Galvannealed Steels

Crystal Structures and Mechanical Properties of Fe–Zn Intermetallic Compounds Formed in the Coating Layer of Galvannealed Steels

Fabrication of High-Density Zn-Bonded Sm–Fe–N Bulk Magnets via High-Velocity Compaction

Microstructural Changes during Interfacial Diffusion at the Sm<sub>2</sub>Fe<sub>17</sub>–Zn Interface

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