Corrosion resistance of amorphous and nanocrystalline Fe–M–B (MZr, Nb) alloys

Souza, Carlos Alberto Caldas de; Oliveira, Marcelo Falção de; May, J.E.; Mariano, Neide Aparecida; Kuri, S.E.; Kiminami, Cláudio S.

doi:10.1016/s0022-3093(00)00174-5

Cited by 66 publications

(24 citation statements)

References 14 publications

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“…As there is no hint to assume stronger low-temperature macroscopic stress in vacuum annealed Si-rich Finemets, stronger MH-caused spreading of interior by surfaces in Ar-annealed samples appears to be the more probable explanation. This would agree with the sense of etching experiment and with an expected action of the "silicon-oxide layer" [8,12]. Unfortunately, we know very little about a possible hightemperature stress and this is especially important just in Si-rich Finemets since CI anisotropy could be far stronger than ME anisotropy in these low-magnetostrictive materials.…”

Section: Magnetic Anisotropy and Macroscopic Heterogeneity Of Si-richsupporting

confidence: 81%

“…In Table 2, the column label "DO3" means in fact, how good is the fit of measured spectrum when a superposition of DO3 components is assumed. Considering eg the XPS results [6] or corrosion studies [8,12], silicon is seen to engage in SiO x oxides and its availability for the DO3-forming Fe 3 Si is thus limited at ribbon surfaces. In the same spirit of oxidation chance for silicon, the surfaces of Ar-or air-annealed samples are more DO3-poor than the vacuum-annealed ones.…”

Section: Magnetic Anisotropy and Macroscopic Heterogeneity Of Si-richmentioning

confidence: 99%

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Application Potential of Nanocrystalline Ribbons Still Pending

Butvin¹,

Butvinová²,

Švec³

et al. 2010

Journal of Electrical Engineering

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Nanocrystalline soft-magnetic ribbons promised a wide-spread practical use when introduced at the beginning of nineties. After 20 years of extensive research there are still unclear material problems which are thought to be the principal reason why these materials show but marginal use. Poorly controllable magnetic anisotropy due to spontaneous intrinsic macroscopic stress that comes from an inevitable heterogeneity of the ribbon materials is pointed to in this work. Certain stress-based mechanisms are shown to induce the unintended anisotropy in the already familiar Finemets as well as in the newer Hitperms. Hysteresis loops, domain structure and power loss is used to reveal the anisotropy consequences and particular connected but still unanswered questions are pinpointed.

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Section: Magnetic Anisotropy and Macroscopic Heterogeneity Of Si-richsupporting

confidence: 81%

Section: Magnetic Anisotropy and Macroscopic Heterogeneity Of Si-richmentioning

confidence: 99%

Application Potential of Nanocrystalline Ribbons Still Pending

Butvin¹,

Butvinová²,

Švec³

et al. 2010

Journal of Electrical Engineering

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“…Some Fe-based metallic glasses with high electrocatalytic efficiency are reported, such as a low overpotential η 300 = 318 mV for amorphous Fe 71 [133]. It is evident that the Tafel slope as well as overpotential decrease with increase of Mo content at the same conditions [132].…”

Section: Electrocatalytic Properties Of Metallic Glassesmentioning

confidence: 96%

“…A comparison of passive current density I pass , corrosion/transpassivation potential E corr and corrosion rate CPR for some Fe-based metallic glasses and their crystalline alloy is summarized in Table 4 [69][70][71]. It can be observed from Table 4 that the corrosion/passive current density and corrosion rate increase for the crystalline alloys compared with metallic glass, while corrosion/transpassivation potential depends on their compositions.…”

Section: Effects Of Microstructure Homogeneitymentioning

confidence: 99%

Corrosion Resistance and Electrocatalytic Properties of Metallic Glasses

Wang¹

2016

Metallic Glasses - Formation and Properties

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Metallic glasses exhibit excellent corrosion resistance and electrocatalytic properties, and present extensive potential applications as anticorrosion, antiwearing, and catalysis materials in many industries. The effects of minor alloying element, microstructure, and service environment on the corrosion resistance, pitting corrosion, and electrocatalytic efficiency of metallic glasses are reviewed. Some scarcities in corrosion behaviors, pitting mechanism, and eletrocatalytic reactive activity for hydrogen are discussed. It is hoped that the overview is beneficial for some researcher paying attention to metallic glasses.

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“…Estos materiales son objeto de estudio por sus propiedades magnéticas como la permeabilidad efectiva y la densidad de flujo de saturación magnético (8)(9)(10). Sus propiedades les hacen materiales alternativos en dispositivos magnéticos como transformadores de frecuencia, motores, generadores y sensores.…”

Section: Introductionunclassified

Desarrollo de materiales de base Fe a partir de la síntesis de precursores por aleado mecánico

González¹,

Martínez²,

Artalejo³

et al. 2005

Bol. Soc. Esp. Ceram. Vidr.

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Se han producido mediante síntesis mecánica aleaciones ricas en Fe, con Zr o Nb y con un no metal, B obteniéndose materiales nanoestructurados con una incipiente fase amorfa (entorno 12%). Tanto el Zr y el Nb como el B facilitan la reducción del tamaño de los nanocristales. Se han optimizado las condiciones de proceso, minimizando el tiempo de molturación. Además, el posterior tratamiento térmico, controlado mediante calorimetría diferencial, de las diferentes aleaciones permite obtener la energía de activación de los procesos de cristalización, con valores entre 280 y 410 kJ mol -1 asociados al crecimiento cristalino. El control del tamaño de los nanocristales se enmarca en el estudio de la cinética de las transformaciones fuera del equilibrio en las que la fase incipiente tiene composición diferente a la de la fase inicial.Palabras clave: aleado mecánico, DSC, XRD, aleaciones metal -no metal. Development of Fe based materials obtained by mechanical alloyingFe rich alloys with ZrNi or Nb and with non metallic B were developed by means of mechanical alloying. The material is nanocrystalline with a minoritary amorphous phase (about 12%). The reduction of the crystallite size is favoured by the addition of Zr, Nb or B. The mechanical alloying parameters were optimised to obtain a nanocrystalline state at low milling time. Furthermore, the apparent activation energy of the crystallisation processes was obtained by thermal treatment, controlled by differential scanning calorimetry. Typical values between 280 and 410 kJ mol -1 are associated to crystalline growth. The control of the crystal size is related to the kinetic study of the non-equilibrium transformations where the incipient phase as different composition that the initial phase. Keywords: mechanical alloying, DSC, XRD, metal -non metal alloys INTRODUCCIÓNLa síntesis de aleaciones mediante la técnica del aleado mecánico (MA) permite la obtención tanto de fases de equilibrio como de no equilibrio, incluyendo materiales nanoestructurados, amorfos, o la extensión de los límites de solubilidad (1-3). Durante el aleado mecánico, las partículas de polvo de los precursores son sometidas a sucesivas fracturas y soldaduras en frío originadas por fenómenos de percusión y de abrasión. Las superficies frescas resultantes tras la fractura facilitan la formación de nuevas partículas y la aleación entre los diferentes precursores en forma de capas con la correspondiente interdifusión.Recientemente, aleaciones de base Fe (conteniendo nanocristales de α-Fe de tamaño inferior a los 100nm) con algún elemento no metálico como el B del tipo Fe-Zr-B o Fe-Nb-B han sido obtenidas mediante nanocristalización inducida térmicamente (4) de aleaciones amorfas previamente producidas en forma de cinta mediante técnicas de solidificación rápida (5-7). Estos materiales son objeto de estudio por sus propiedades magnéticas como la permeabilidad efectiva y la densidad de flujo de saturación magnético (8-10). Sus propiedades les hacen materiales alternativos en dispositivos magnéticos como tran...

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Corrosion resistance of amorphous and nanocrystalline Fe–M–B (MZr, Nb) alloys

Cited by 66 publications

References 14 publications

Application Potential of Nanocrystalline Ribbons Still Pending

Application Potential of Nanocrystalline Ribbons Still Pending

Corrosion Resistance and Electrocatalytic Properties of Metallic Glasses

Desarrollo de materiales de base Fe a partir de la síntesis de precursores por aleado mecánico

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