oxidation kinetics and phase evolution of a fe16cr alloy

Chromium evaporation and oxidation characteristics of

Jun 01, 2021 · Long-term oxidation kinetics were also assessed at 800 to 1000 °C for up to 10,000 h in air with 10% H2O to provide further guidance for SOFC BOP component alloy selection.}, doi = {10.1016/j.ijhydene.2021.04.002}, journal = {International Journal of Hydrogen Energy}, number = 41, volume = 46, place = {United States}, year = {Tue Jun 01 00:00

Composition Effects of FePt Alloy Nanoparticles on the

The catalytic activities of FexPt100-x alloy nanoparticles at different compositions (x = 10, 15, 42, 54, 58, and 63) in the electro-oxidation of formic acid have been investigated by using cyclic voltammetry (CV), chronoamperometry, and electrochemical impedance spectroscopy (EIS). It was observed that the electrocatalytic performance was strongly dependent on the FePt particle composition Crystal Structure of the ZrO Phase at Zirconium/Zirconium Jun 27, 2014 · The oxidation of zirconium alloys is a complex process, which starts by the alloy developing a black protective oxide resulting in a parabolically decreasing oxidation rate. between the metal and the oxide under conditions of slow oxide growth before the first abrupt transition to faster oxidation kinetics. A cubic ZrO phase has been

Deciphering atomistic mechanisms of the gas-solid

Distinct atomic processes for initial oxidation of Ni-Al alloy in O 2 and H 2 O vapor. Figure 1 shows the in situ atomic-scale observations of the onset of oxidation process from a clean Ni-Al (110) surface in O 2 and H 2 O (1 × 10 6 mbar) at 350°C, respectively, via high-resolution TEM (HRTEM). In O 2, the oxidation proceeds through a step-edge growth mechanism, i.e., step edges on Evolution of NiO Island Size Distributions during the The classic models of metal oxidation developed by Wagner and Cabrera and Mott presuppose the existence of a planar oxide film and develop eions for the rate at which the film thickens. Missing from those models is a description of how that initially planar film forms. Using scanning tunneling microscopy, we study the growth of NiO islands on the (100) surface of a Ni5Cr alloy during

Hydrogen Oxidation and Evolution Reaction Kinetics on

Dec 06, 2014 · The hydrogen oxidation and evolution reaction (HOR/HER) behavior of carbon supported metal (Pt, Ir, Rh, Pd) nanoparticle electrocatalysts is studied using the H 2 pump approach, in a proton exchange membrane fuel cell (PEMFC) setup. After describing the best method for normalizing the net faradaic currents to the active surface area of the electrodes, we measure the HOR/HER kinetic In situ correlation between metastable phase May 14, 2021 · a Time-dependent temperature (red) and resistance (black) of Cu 47.5 Zr 47.5 Al 5.0 1 and cooled in a vacuum. b The corresponding temporal evolution

Initial atomic-scale oxidation pathways on a Ni15Cr(100

Apr 12, 2021 · Topography of the alloy surface prior to oxidation is given in (a).The progression of oxidation after cumulative O 2 exposures at 500 °C of 7 L (b), (c), 14 L (d), (e), and 18 L (f).All scale Intrinsic activity modulation and structural design of Intrinsic activity modulation and structural design of NiFe alloy catalysts for an ecient oxygen evolution reaction Qiaoling Kang,a Dawei Lai,b Wenyin Tang,b Qingyi Lu *a and Feng Gao *b NiFe alloy catalysts have received increasing attention due to their low cost, easy availability, and excellent

Liquid Phase Separation Mechanism of Cu-40 wt.% Pb

  • AbstractIntroductionExperimentResults and DiscussionConclusionsData AvailabilityAcknowledgmentsSolidification microstructures of Cu-40 wt.% Pb alloy were examined under different undercooling degrees. The liquid phase separation mechanism in the systems with stable miscibility gaps mainly involved Ostwald ripening, Brownian motion, Marangoni migration, and Stokes motion. Stokes had little influence on the liquid phase separation in the early phase and played a leading role in the later period. The liquid phase separation mechanism of Cu-40 wt.% Pb hypermonotectic alloy was illustrated in detail.Intrinsic activity modulation and structural design of NiFe alloy catalysts have received increasing attention due to their low cost, easy availability, and excellent oxygen evolution reaction (OER) catalytic activity. Although it is considered that the co-existence of Ni and Fe is essential for the high catalytic activity, the identification of active sites and Chemical Science Recent Perspective articles Materials Free Full-Text Oxidation Behavior of Oxidation behavior of a refractory AlNbTiVZr0.25 high-entropy alloy at 600900 °C was investigated. At 600700 °C, two-stage oxidation kinetics was found:Nearly parabolic oxidation (n = 0.460.48) at the first stage, transitioned to breakaway oxidation (n = 0.750.72) at the second stage. At 800 °C, the oxidation kinetics was nearly linear (n = 0.92) throughout the entire duration

    Oxides Research Group The Rowland Institute at Harvard

    Research in our group is primarily focused on oxide thin films and nanostructures with emphasis on understanding how processing affects properties. Research activities include developing mechanistic understanding of initial stages of oxidation of metals and oxygen incorporation into oxides under photon irradiation. Phase evolution in oxides and their stability as a function of temperature and Recent understanding of the oxidation and burning of Feb 15, 2019 · The rapid oxidation with linear kinetics at both 472 and 487°C indicated the occurrence of fast oxidation. The oxidation kinetics of magnesium alloys thus has a critical temperature, which ranges from 400 to 450°C depending on the alloy composition.13 Below the critical temperature, there is a slow oxidation rate and a small weight gain. In

    Statistical Study of the Effects of the Composition on the

    • AbstractIntroductionExperimental ProceduresResultsDiscussionConclusionsAcknowledgmentThe effects of alloying elements (Co, Cr, Mo, W, Al, Ti, and Ta) on the oxidation resistance of Ni-based superalloys are studied using the Response Surface Methodology (RSM). The statistical analysis showed that Al and Ta generally improve the oxidation resistance of the alloy, whereas Ti and Mo degrade the oxidation resistance. Co, Cr, and W did not alter oxidation rate significantly when examined by the mass gain averaged for all model alloys. However, it is remarkable that the degree of the effects of alloying el"Plasma oxidation of liquid precursors for complex metal The technique was successfully used to synthesize W 0.99 Ir 0.01 O 3- alloy which showed high oxygen evolution reaction (OER) activity and stability in acid with an overvoltage reduction in the excess of 500 mV compared to the same composition prepared via standard thermal oxidation route. The structural dilution of iridium with earth The Kinetics of Oxidation of Ru-Bearing Nickel-Based Oxidation tests have been undertaken in air on two experimental fourth-generation Nibased superalloys containing, respectively, 3 and 5 wt.% Ru. A Ru-free, third generation alloy (CMSX-10K) was also included in the test programme which used temperatures covering the range 750-1100°C. Where possible, comparisons were also made with literature data on the secondgeneration CMSX-4 alloy

      Transport mechanisms during the high-temperature

      Sep 30, 2019 · We have previously provided direct evidence for Al transport paths along channels in the two-phase microstructure of a ternary Co-Al-W alloy during early stages of Kinetic Aspects of Ti 2 AlC MAX Phase Oxidation SpringerLinkJan 21, 2015 · In our own work, alumina scale growth kinetics on FeCrAl alloys have been shown to be consistent with modified Wagner oxidation models with similar grain boundary diffusivities [10, 12]. An analysis of the MAX phase oxidation literature has revealed diffusivities similar to those calculated for alumina scales formed on FeCrAl alloys [9, 13, 14]. It is proposed that various kinetic behaviors can

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