Atomic-resolution evaluation of microsegregation and degree of atomic order at antiphase boundaries in Ni50Mn20In30 Heusler alloy

Niitsu, Kodai; Minakuchi, Kazuhiro; Xu, Xiao; Nagasako, Makoto; Ohnuma, Ikuo; Tanigaki, Toshiaki; Murakami, Yasukazu; Shindo, Daisuke; Kainuma, Ryosuke

doi:10.1016/j.actamat.2016.09.035

Cited by 16 publications

(5 citation statements)

References 32 publications

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“…As we know, two types of APB were reported in the Heusler alloys: a a 4 111 ½ shift APB in the half-metallic Heusler alloy Co 2 Fe(Al,Si) (Niitsu et al, 2017) and a a 2 100 ½ shift APB in the Heusler alloy Ni 50 Mn 20 In 30 (Vronka et al, 2020). We found that the second type of APB should be in the Heusler alloy Mn 2 RuSn and it was adopted to build the structural model as below.…”

Section: Resultsmentioning

confidence: 99%

“…Antiphase boundary (APB), as one of the important microor nanostructures, was investigated in the Heusler compounds to explore its effects on magnetic properties, e.g. domains, spin-polarization and exchange interactions (Lapworth et al, 1971;Venkateswaran et al, 2007;Umetsu et al, 2011;Murakami et al, 2013;Nedelkoski et al, 2016;Niitsu et al, 2017;Vronka et al, 2020;Levin et al, 2021). Intensive studies on the APB and its related long-periodic structures were initially investigated in AuCu, AuCu 3 and Au 3 Cu (Ogawa & Watanabe, 1954;Glossop & Pashley, 1959;Yamaguchi et al, 1962;Toth & Sato, 1964;Hashimoto & Ogawa, 1970;Sinclair & Thomas, 1975).…”

Section: Introductionmentioning

confidence: 99%

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A modulated structure derived from the XA-type Mn₂RuSn Heusler compound

Li¹,

Zhang²,

Skomski³

et al. 2022

Acta Crystallogr Sect B

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A modulated structure derived from the inverse Heusler phase (the XA-type and the disordered variant L21B-type) has been observed in rapidly quenched Mn2RuSn ribbons. The powder X-ray diffraction pattern of the quenched ribbons can be indexed as an L21B-type structure. Electron diffraction patterns of the new structure mostly resemble those of the XA-type (and the disordered variant L21B-type) structure and additional reflections with denser spacing indicate a long periodicity. Orthogonal domains of the modulated structure were revealed by a selected-area electron diffraction pattern and the corresponding dark-field transmission electron microscopy images. The structure was further studied by the crystallographic analysis of high-resolution transmission electron microscopy images. A model for the modulated structure has been proposed to interpret the experimental results.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A modulated structure derived from the XA-type Mn₂RuSn Heusler compound

Li¹,

Zhang²,

Skomski³

et al. 2022

Acta Crystallogr Sect B

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“…However, it remains questionable whether such an abrupt change in composition occurs at the atomic slab boundary in light of the thermodynamic (local) equilibrium. Thermodynamic equilibrium dictates a gradual change in composition [ 24 ] and accordingly modifies the geometrical feature of the chemical composition variation. To capture the essential feature of structural/chemical modifications, we performed HAADF-STEM observations for the η ” phase of a 70.4 at.%Al specimen equilibrated below and above the η / η ” phase-transformation temperature and exploited the geometrical features by performing geometrical phase analysis.…”

Section: Discussionmentioning

confidence: 99%

“…These features are intrinsically inseparable for thermal APBs. The chemical composition of the antiphase domains (APDs) and APBs should be different and the difference is ideally dictated by the common tangent law for the Gibbs free energy curves of the APD (herein η ”) and APB ( η ) structures [ 24 ]. Concomitantly, a discrete change in chemical composition is energetically unfavorable; thus, thermal APBs have a finite width to satisfy the local thermodynamic equilibrium.…”

Section: Discussionmentioning

confidence: 99%

Phase equilibria among η-Fe₂Al₅ and its higher-ordered phases

Hamada

Higashi

Niitsu

et al. 2021

Science and Technology of Advanced Materials

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Phase equilibria among η-Fe 2 Al 5 and its higher-ordered phasesPhase equilibria among the η-Fe 2 Al 5 phase and its higher-ordered phases with the η framework structure were determined experimentally. The solubility range of the η phase at elevated temperature does not differ remarkably from that in previous studies, but this phase is found to undergo complicated phase transformations upon cooling. Four phases are present, namely η', η'', η''' and η m , with higher-order atomic orderings in the c-axis chain sites of the orthorhombic crystal structure of the parent η phase. The η'' and η''' phases form on the Al-poor and Al-rich sides, respectively, in equilibrium with the ζ-FeAl 2 phase below ~415 °C and θ-Fe 4 Al 13 phase below ~405 °C. The η' and η m phases become stable below 312 °C and 343 °C with the peritectoid reactions η' → η m + η''' and η m → η + η'', respectively. The η phase is not stable below 331 °C with the eutectoid reaction of η m + η''' → η. On the basis of these findings, we unraveled the phase equilibria among the η-Fe 2 Al 5 phase and its higher-ordered phases with the η framework structure.

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“…Carbon atoms diffuse to area rich in manganese, chromium and other alloys. As a result, ferrite transformation occurs in area with lower content of alloys, and pearlite transformation, bainite transformation and even martensite transformation occurs in area rich in alloys [9].…”

Section: Introductionmentioning

confidence: 99%

Causes and Control Mechanism of Abnormal Structure in the Center of SWRH82B Wire-Rod-Steel

Liao¹,

Wei

Li³

et al. 2019

MSF

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The cause of drawing fracture of SWRH82B wire rods was analyzed by using optical microscopy, scanning electron microscope - energy dispersive spectrometer and electron probe micro-analyzer - wavelength dispersive spectrometer. A multivariate diffusion model was established in Thermo-Cale, and the effects of temperature and time on diffusion behavior of alloys were studied. Results show that cementite network and martensite in the center area of rod is main cause of tensile fracture. There is serious segregation of chromium and manganese in the central area. The CCT curve moves to right, and critical cooling rate of martensite decreases. With high cooling rate, time for eutectoid transition is insufficient, and martensite transformation occurs in segregation band. The segregation of phosphorus further worsen the brittleness of steel. With increase of heating temperature and duration of heating time, segregation in final product is reduced, and content of cementite network and martensite decreases. When the temperature is maintained at 1050 °C for 600 s, there is no segregation of phosphorus and carbon. The diffusion of chromium is even when temperature is maintained at 1150 °C for 5400 s, and an even diffusion of manganese is obtained when temperature is maintained at 1200 °C for 3000 s. In stelmor air cooling process, the key point is keeping cooling rate low to extend holding time, and to optimize microstructure and properties.

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Atomic-resolution evaluation of microsegregation and degree of atomic order at antiphase boundaries in Ni50Mn20In30 Heusler alloy

Cited by 16 publications

References 32 publications

A modulated structure derived from the XA-type Mn₂RuSn Heusler compound

A modulated structure derived from the XA-type Mn₂RuSn Heusler compound

Phase equilibria among η-Fe₂Al₅ and its higher-ordered phases

Causes and Control Mechanism of Abnormal Structure in the Center of SWRH82B Wire-Rod-Steel

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Atomic-resolution evaluation of microsegregation and degree of atomic order at antiphase boundaries in Ni50Mn20In30 Heusler alloy

Cited by 16 publications

References 32 publications

A modulated structure derived from the XA-type Mn2RuSn Heusler compound

A modulated structure derived from the XA-type Mn2RuSn Heusler compound

Phase equilibria among η-Fe2Al5 and its higher-ordered phases

Causes and Control Mechanism of Abnormal Structure in the Center of SWRH82B Wire-Rod-Steel

Contact Info

Product

Resources

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A modulated structure derived from the XA-type Mn₂RuSn Heusler compound

A modulated structure derived from the XA-type Mn₂RuSn Heusler compound

Phase equilibria among η-Fe₂Al₅ and its higher-ordered phases