Search Results - "Gheno, Thomas"

Mechanism of breakaway oxidation of Fe–Cr and Fe–Cr–Ni alloys in dry and wet carbon dioxide by Gheno, Thomas, Monceau, Daniel, Young, David J.

“…► Model Fe–Cr and Fe–Cr–Ni alloys are exposed to Ar–CO2 and Ar–CO2–H2O at 650°C. ► Fast Fe-rich oxide growth occurs on all alloys except the 25Cr ternaries. ►…”
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First-principles calculations, experimental study, and thermodynamic modeling of the Al-Co-Cr system by Liu, Xuan L, Gheno, Thomas, Lindahl, Bonnie B, Lindwall, Greta, Gleeson, Brian, Liu, Zi-Kui

“…The phase relations and thermodynamic properties of the condensed Al-Co-Cr ternary alloy system are investigated using first-principles calculations based on…”
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Experimental study and thermodynamic modeling of the Al-Co-Cr-Ni system by Gheno, Thomas, Liu, Xuan L, Lindwall, Greta, Liu, Zi-Kui, Gleeson, Brian

“…A thermodynamic database for the Al-Co-Cr-Ni system is built via the Calphad method by extrapolating re-assessed ternary subsystems. A minimum number of…”
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On the role of surface deformation in the oxidation of NiCr alloys at 340–600 °C by Gheno, Thomas, Desgranges, Clara, Martinelli, Laure

“…[Display omitted] •Grain boundary and dislocation densities measured in polished and ground Ni-30Cr.•Polishing, grinding yield similar defect densities but…”
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Modeling the Role of the Grain Structure in the Oxidation of Polycrystals by Gheno, Thomas, Djedaa Walid

“…The diffusion properties of polycrystalline materials depend on their grain shape and size, which determine the spatial distribution of grain boundaries. These…”
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Modes of Deposit-Induced Accelerated Attack of MCrAlY Systems at 1100 °C by Gheno, Thomas, Gleeson, Brian

“…The reaction of cast NiCoCrAlY alloys with oxide–sulfate deposits in CO 2 –H 2 O–O 2 was studied at 1100 °C. The minimum Al concentration needed to form an…”
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On the Reaction Mechanism of MCrAlY Alloys with Oxide–Sulfate Deposits at 1100 °C by Gheno, Thomas, Gleeson, Brian

“…The corrosion of γ -(Ni,Co) +  β -(Ni,Co)Al NiCoCrAlY alloys exposed to CaO-rich, Na 2 SO 4 -containing deposits in air and CO 2 –H 2 O–O 2 at 1100 °C was…”
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Kinetics of Al2O3-Scale Growth by Oxidation and Dissolution in Molten Silicate by Gheno, Thomas, Gleeson, Brian

“…During the high-temperature oxidation of an alloy, the growth of a protective oxide scale selectively consumes one of the alloying elements. This can be…”
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Screening for Al2O3 failure in MCrAlY APS coatings using short-term oxidation at high temperature by Texier, Damien, Ecochard, Maxime, Gheno, Thomas, Monceau, Daniel, Salem, Mehdi, Lours, Philippe

“…•Isothermal oxidation of freestanding MCrAlY coating of various thicknesses was conducted at 1150 °C.•The intrinsic chemical failure (InCF) of MCrAlY coating…”
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Effects of Al and refractory alloying elements (W, Ta and Hf) on oxidation kinetics, oxygen dissolution and diffusion in titanium alloys by Gautier, Kevin, Epifano, Enrica, Gheno, Thomas, Connétable, Damien, Monceau, Daniel

“…The effect of aluminium, tungsten, tantalum and hafnium on the oxidation behaviour of titanium was investigated. Model alloys were oxidized in air for 5000 h…”
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Simulation of diffusion with non-equilibrium vacancies, Kirkendall shift and porosity in single-phase alloys by Gheno, Thomas, Szczepan, Victor, Salsi, Camille, Desgranges, Clara, Monceau, Daniel

“…[Display omitted] In an alloy subject to vacancy-mediated diffusion, differences in intrinsic diffusivities tend to produce vacancy excess and deficit. These…”
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Effect of Compressive Creep and Hydrostatic Pressure on Diffusion in NiCr and NiSi Systems by Salsi, Camille, Monceau, Daniel, Desgranges, Clara, Gheno, Thomas

“…Interdiffusion coefficients were measured in NiSi and NiCr systems from diffusion couples under hydrostatic pressures between 50 and 326 MPa, at 1200 °C…”
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Size effects on high temperature oxidation of MCrAlY coatings processed via APS and HVOF depositions by Kalush, Ali, Texier, Damien, Ecochard, Maxime, Sirvin, Quentin, Choquet, Karim, Gheno, Thomas, Vanderesse, Nicolas, Jomaa, Walid, Bocher, Philippe

“…The paper demonstrates how defects inherited from the deposition processes can severely impair the lifetime of MCrAlY coatings in service. The oxidation…”
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Carburisation of ferritic Fe–Cr alloys by low carbon activity gases by Gheno, Thomas, Monceau, Daniel, Zhang, Jianqiang, Young, David J.

“…► Model Fe–Cr alloys are exposed to Ar–CO 2 and Ar–CO 2–H 2O at 650 and 800 °C. ► Alloy microstructures are extensively modified by carburisation. ► Chromium…”
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Kinetics of Alloy Depletion During Selective Oxidation in Polycrystals by Gheno, Thomas, Rio, Catherine, Rimpot Etienne, Mercier Sébastien

“…Grain-boundary diffusion affects composition profiles developed during selective oxidation in polycrystals. It is therefore desirable to consider the grain…”
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Reaction morphologies developed by nickel aluminides in type II hot corrosion conditions: The effect of chromium by Gheno, Thomas, Zahiri Azar, Maryam, Heuer, Arthur H., Gleeson, Brian

“…•NiAl is not prone to hot corrosion initially, but to localized internal oxidation.•NiAlCr is unable to passivate and immediately undergoes uniform hot…”
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Kinetics of breakaway oxidation of Fe–Cr and Fe–Cr–Ni alloys in dry and wet carbon dioxide by Gheno, Thomas, Monceau, Daniel, Young, David J.

“…•Model Fe–Cr and Fe–Cr–Ni alloys are reacted in Ar–CO2 and Ar–CO2–H2O at 650°C.•Breakdown of the initially protective oxide scale results in Fe-rich oxide…”
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Tracer diffusion of Cr in Ni and Ni-22Cr studied by SIMS by Gheno, Thomas, Jomard, François, Desgranges, Clara, Martinelli, Laure

“…The volume diffusion of Cr in Ni and in Ni-22Cr (at. %) was studied from tracer experiments, using 52Cr and 54Cr as tracers, in the temperature range…”
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Grain boundary diffusion of chromium in polycrystalline nickel studied by SIMS by Gheno, Thomas, Jomard, François, Desgranges, Clara, Martinelli, Laure

“…The grain boundary diffusion of chromium in polycrystalline nickel was studied by means of tracer experiments at 346–668 °C. Intensity-depth profiles were…”
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Thermodynamic modeling of Al–Co–Cr, Al–Co–Ni, Co–Cr–Ni ternary systems towards a description for Al–Co–Cr–Ni by Liu, Xuan L., Lindwall, Greta, Gheno, Thomas, Liu, Zi-Kui

“…The phase relations and thermodynamic properties of the Al–Co–Cr, Al–Co–Ni, Co–Cr–Ni ternary alloys are investigated using first principles calculations based…”
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