Application of MTDATA to the Modeling of Multicomponent Equilibria

Davies, R. H.; Dinsdale, Alan; Chart, T. G.; Barry, T. I.; Rand, M. H.

doi:10.1007/978-1-4612-0481-7_19

Cited by 29 publications

(23 citation statements)

References 3 publications

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“…However, it was possible to compare the heat evolved using a model of microsegregation and a thermophysical software program like MTDATA. [3] When this comparison was made, the experimental results compared well with the predictions, except at the highest Cu concentrations. [1] Despite the reasonable agreement, it was recognized that calorimetry was a relatively insensitive method for investigating the progress of microsegregation, because there was only a small change in the amount of heat evolved for the two extremes of equilibrium freezing and there was no diffusion in the solid.…”

Section: Introductionmentioning

confidence: 71%

Microsegregation in Al-Cu alloys

Kurum

Dong

Hunt

2005

Metall Mater Trans A

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A comparison has been made between the amount of microsegregation predicted by a numerical model and that found experimentally in Al-Cu alloys varying in composition between 1 and 8 wt pct Cu. A depleted region was predicted and observed experimentally near the Al 2 Cu. The depleted region was formed below the eutectic temperature and had a significant effect on the ordered compositionfraction plots, particularly for high alloy compositions. Although the fit between experiment and theory was reasonably good, it was concluded that it was necessary to propose that local equilibrium was not maintained between the phases in the solid-state reactions.

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Section: Introductionmentioning

confidence: 71%

Microsegregation in Al-Cu alloys

Kurum

Dong

Hunt

2005

Metall Mater Trans A

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“…The software package Metallurgical and Thermochemical Databank (MTDATA) version 4.74, which was developed by the National Physical Laboratory (NPL) [62] was used to carry out equilibrium thermodynamic calculations. MTDATA is a software package that allows equilibrium to be calculated for multicomponent systems, containing many different types of phase, from critically assessed data for their component binary, ternary and higher order subsystems.…”

Section: Thermodynamic Calculationsmentioning

confidence: 99%

Oxidation of MCrAlY coatings on Ni based superalloys

Pace¹,

Thomson²

2007

Energy Materials

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i AcknowledgementsFirstly I would like to thank the Department of Materials for the use of their materials and facilities. The range of equipment available and people have made working there a pleasure, but also allowed the use of several techniques that proved invaluable.I am grateful to my project supervisor, Professor R. C. Thomson; firstly for offering me such an interesting project and secondly, for her guidance and support, which have been invaluable during this project.I would also like to thank Dr G. West for the continued support he has given me throughout my PhD. His help and guidance on many aspects (especially on FIBSEM and TEM related matters) have been immeasurable, but more than that I am extremely grateful for his moral support and his friendship; working with him is something I will miss. I would also like to thank my fellow office mates, especially Juan Sanchez-Hanton and Kate Burke for helping to create such an enjoyable office atmosphere.I am also extremely grateful to RWE npower for part funding this project and giving me the opportunity to look at such an interesting area of metallurgy. I am especially grateful to Dr Jon Wells from RWE npower, not only for providing a raft of samples but for his advice and support throughout.Finally, I would like to thank my friends and family for their support and encouragement throughout, especially my parents for having always been there to offer help and support, and Anne for always cheering me up and supporting me through the difficult times.ii AbstractEnsuring a sustainable power generation supply into the future is of worldwide importance. A combination of power generation methods to meet this (including both fossil plant and renewables) is a certainty. Therefore, the maintenance of conventional fossil-fired plants is required to provide a low cost, flexible and reliable electricity supply, and in order to conserve fuel resources it is important to ensure they operate as efficiently as possible. Lifetime predictions of important components (such as turbine blades in industrial gas turbine engines) are essential in order to avoid failures and unnecessary downtime, improve the ability to schedule routine maintenance work and to help develop new coating systems to meet the ever more demanding requirements. Better models would allow improved predictions and mean that service schedules could be set with better accuracy thereby, limiting downtime and reducing costs as well as being better able to predict coating performance and thus increase engine efficiency.Ni-based superalloys are a common material utilised for turbine blades due to their high temperature strength. Coupled with MCrAlY coating systems and thermal barrier coatings (TBC) they are able to withstand both the high temperatures and arduous environments they will encounter during service. In order to effectively predict the lifetime of components such as turbine blades it is vital to understand the oxidation behaviour of these systems and how factors such as the MCrAlY composition, processing f...

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“…c ∞ is the equilibrium solute interface concentration determined from thermodynamic data contained within the MTDATA software [6]. MTDATA is adapted in this work to take account of irradiation-induced phase instability.…”

Section: Precipitation Modelmentioning

confidence: 99%

“…The thermodynamic data for determining the relative stabilities of different phases in commercial alloys has become available in digital format through such packages as Thermocalc, Dictra, and MTDATA [6]. The mechanisms for nucleation and growth have become better understood and considerable progress has been made with identifying the mechanisms of heterogeneous nucleation and growth, particularly on grain boundaries.…”

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confidence: 99%

Irradiation-induced precipitation modelling of ferritic steels

Yin

Faulkner

2009

Journal of Nuclear Materials

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In high strength low alloy (HSLA) steels typically used in reactor pressure vessels (RPV), irradiation induced microstructure changes affect the performance of the components. One such change is precipitation hardening due to the formation of solute clusters and/or precipitates which form as a result of irradiation enhanced solute diffusion and thermodynamic stability changes. The other is irradiation enhanced tempering which is a result of carbide coarsening due to irradiation enhanced carbon diffusion. Both effects have been studied using a recently developed Monte Carlo based precipitation kinetics simulation technique and modelling results are compared with experimental measurements. Good agreements have been achieved.

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Application of MTDATA to the Modeling of Multicomponent Equilibria

Cited by 29 publications

References 3 publications

Microsegregation in Al-Cu alloys

Microsegregation in Al-Cu alloys

Oxidation of MCrAlY coatings on Ni based superalloys

Irradiation-induced precipitation modelling of ferritic steels

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