IMPRESS Integrated Project—An overview paper

Jarvis, D.J.; Voß, Daniela

doi:10.1016/j.msea.2005.09.066

Cited by 93 publications

(47 citation statements)

References 13 publications

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“…IMPRESS project [49]). Here, we have combined Model A with a 3D model of polycrystalline solidification relying on the quaternion representation of the crystallographic orientations [26] and adopted it to constant temperature gradient and a moving frame.…”

Section: Columnar To Equiaxed Transition In Model Amentioning

confidence: 99%

Phase field approach to heterogeneous crystal nucleation in alloys

et al. 2009

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We extend the phase field model of heterogeneous crystal nucleation developed recently [L. Gránásy, T.Pusztai, D. Saylor, and J. A. Warren, Phys. Rev. Lett. 98, 035703 (2007)] to binary alloys. Three approaches are considered to incorporate foreign walls of tunable wetting properties into phase field simulations: a continuum realization of the classical spherical cap model (called Model A herein), a non-classical approach (Model B) that leads to ordering of the liquid at the wall, and to the appearance of a surface spinodal, and a non-classical model (Model C) that allows for the appearance of local states at the wall that are accessible in the bulk phases only via thermal fluctuations. We illustrate the potential of the presented phase field methods for describing complex polycrystalline solidification morphologies including the shish-kebab structure, columnar to equiaxed transition, and front-particle interaction in binary alloys. PACS number(s): 64.60. Qb, 64.70.Dv, 82.60.Nh

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Section: Columnar To Equiaxed Transition In Model Amentioning

confidence: 99%

Phase field approach to heterogeneous crystal nucleation in alloys

et al. 2009

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“…25 The author would also like to acknowledge Johnson Matthey and the EU for financial support through the IMPRESS integrated project (Contract NMP3-CT-2004-500635), co-funded by the European Commission in the sixth Framework Programme and the European Space Agency.…”

Section: Acknowledgementsmentioning

confidence: 99%

Origin of catalytic activity in sponge Ni catalysts for hydrogenation of carbonyl compounds

Jones

2015

Catalysis, Structure & Reactivity

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hydrogenation, where the activity is dependent on the C affinity of the catalysts. It is thus suggested that should one desire to selectively hydrogenate a carbonyl group in the presence of an alkene then the use of early transition metal dopants may facilitate this selectivity. Alternatively, one could use a dopant that is able to reduce the affinity for C but maintains a high O affinity. The origin of the activity change due to doping is shown to be the intrinsic electronic structure of the dopant rather than a perturbation of the lattice constant due to the dopant atom.

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“…The selected applications include the development of a novel, low density, highly heat-resistant structural -TiAl intermetallic alloy and incorporation of this novel material into aircraft and rotating components under severe conditions, e.g. large 40 cm low-pressure turbine blades for commercial aero-engines [2]. One of the main scientific objectives of the IMPRESS project is quantitative determination and understanding of the fundamental mechanisms that control growth and evolution of grains, including the columnar to equiaxed transition (CET), during solidification of -TiAl intermetallic alloys.…”

Section: Introductionmentioning

confidence: 99%

Combined Analytical and Numerical Front Tracking Approach to Modeling Directional Solidification of a TiAl-Based Intermetallic Alloy for Design of Microgravity Experiments

Rebow

Browne

Fautrelle

2010

MSF

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Abstract.A three-step combined analytical and numerical approach to thermal modelling of a twoheater power-down furnace for controlled directional solidification of an intermetallic alloy is proposed. An analytical sensitivity analysis of the thermal model is carried out to show the effect of adiabatic zone length, and both hot-zone and cold-zone heater temperatures, on the initial thermal gradient in the sample and on the length of melt in the adiabatic zone. The subsequent axisymmetric front tracking method (FTM) simulations of directional solidification of a binary intermetallic Ti46at.%Al alloy show that temperature gradient in the melt declines and velocity of the solid-liquid front increases with time, thus promoting good conditions for a columnar to equiaxed transition. The proposed analytical calculations combined with full-scale numerical FTM simulations provide a convenient and predictive optimization tool for the two-heater power-down furnace design and growth conditions for the future microgravity experiments.

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IMPRESS Integrated Project—An overview paper

Cited by 93 publications

References 13 publications

Phase field approach to heterogeneous crystal nucleation in alloys

Phase field approach to heterogeneous crystal nucleation in alloys

Origin of catalytic activity in sponge Ni catalysts for hydrogenation of carbonyl compounds

Combined Analytical and Numerical Front Tracking Approach to Modeling Directional Solidification of a TiAl-Based Intermetallic Alloy for Design of Microgravity Experiments

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