Article
Chemistry, Physical
Senlin Cui, Matthew Lynn, Ralph E. Napolitano
Summary: The thermodynamics of the Pt-Sn system were investigated by experiments and a critical evaluation of literature data, leading to thermodynamic assessments using the CALPHAD approach. The modeling results compared favorably with reliable experimental data, providing a good representation of phase equilibria and thermodynamic properties in this system.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
I. Fartushna, A. Samelyuk, K. Meleshevich, I. Tikhonova, V. Novichenko, M. Bulanova
Summary: This paper presents a comprehensive study on the phase equilibria in the Al-Fe-V system using various techniques, and constructs phase diagrams and isothermal lines to describe the equilibrium phases and reactions. The results show the existence of multiple phase equilibria and transformations at different temperatures.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
D. F. Barros, J. C. P. Santos, D. A. Abreu, A. A. A. P. Silva, K. E. Borowski, N. Chaia, C. A. Nunes, G. C. Coelho
Summary: The liquidus projection of the Al-Cr-V system is proposed for the first time in this study, aiming to improve the literature data related to this system and contribute to the development of alloys with good oxidation resistance. Experimental investigations were conducted to characterize the microstructure of as-cast alloys, revealing the primary precipitation fields and the mutual solution of V and Cr in the Al-V and Al-Cr systems. Several ternary invariant reactions were suggested based on experimental data and thermodynamic extrapolation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Frank Czerwinski
Summary: The strength retention of Al-Ce binary alloys at high temperatures was assessed compared to A380 alloy and pure Al. The Al11Ce3 eutectic and proeutectic phases were found to have limited effectiveness in strengthening Al-Ce alloys at room temperature and retaining their strength at increased temperatures. Despite the high hardness retention ratio of Al-Ce alloys, the yield stress decreased with testing temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Rene Boettcher, Adriana Ispas, Andreas Bund
Summary: Aluminum needs to be alloyed to achieve effective cathodic corrosion protection under mild atmospheric conditions due to the formation of an insulating oxide layer. Aluminum alloys with Cr, Zn, and Sn have been studied and their corrosion behavior and protection capabilities investigated. Pure aluminum provides excellent corrosion protection in chloride-containing environments, but not under ambient conditions. Alloys with zinc provide superior corrosion protection compared to aluminum, while alloys with tin show high activity and rapid dissolution. Alloying aluminum is necessary to achieve effective cathodic corrosion protection under mild atmospheric conditions.
Article
Chemistry, Physical
U. K. Sultana, M. Shevchenko, E. Jak
Summary: The study investigated phase equilibria of the AgO0.5-FeO1.5-SiO2 system in a wide temperature range, using various experimental techniques to accurately characterize the system. The data obtained were used to develop thermodynamic models for all phases in the system, contributing to the overall understanding of complex multicomponent pyrometallurgical systems.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Alan J. Ardell
Summary: This study re-examines the kinetics of γ' precipitates in binary Ni-Al alloys. It was found that a previous investigation had made an unfortunate error in unit conversion, rendering all conclusions unreliable. The re-analysis shows that the equations describing skeletal coarsening kinetics are not trustworthy in providing useful quantitative information on the coarsening of non-skeletal microstructures and the elastic energy of γ' precipitates with misfit.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Jiaxing Sun, Cuiping Guo, Changrong Li, Zhenmin Du
Summary: This work focuses on understanding the solidification microstructure and phase constituents of Co-Ta-Zr alloys. The liquidus surface projection and binary phase diagrams were used to determine the solidification regions. Six three-phase equilibria were observed and the maximum solubilities of Zr and Ta in different phases were determined. The Co-Ta-Zr system was optimized using the CALPHAD method and the thermodynamic models of the intermetallic phases were established. The calculated solidification paths and phase fractions can provide guidance for material design and thermal processing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Dawei Wei, Xiaofeng Bai, Cuiping Guo, Changrong Li, Zhenmin Du
Summary: The solidification microstructures of as-cast alloys and the equilibria microstructure of annealed alloys in the Co-Nb-Ti system were determined. The system was optimized using the CALPHAD method and a set of reliable thermodynamic parameters was obtained.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Jiaxing Sun, Chunyu Ming, Bo Yang, Cuiping Guo, Changrong Li, Zhenmin Du
Summary: The liquidus surface projection and phase relationships were constructed in the Fe-Hf-Nb system at 1373 and 1273 K based on the solidification microstructure and phase constituents. The composition ranges of Nb in the ternary phase r were determined to be -20.5-30.8 at.% and -20.8-30.2 at.%, respectively. The maximum solubilities of Nb in FeHf2 were -16.9 at.% and -16.0 at.%, and the maximum solubilities of Hf in mu were -4.6 at.% and -3.3 at.%. The thermodynamic parameters of the individual phases were optimized using the CALPHAD method, and a set of self-consistent parameters was obtained for the Fe-Hf-Nb system. (c) 2023 Elsevier B.V. All rights reserved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Georgii Khartcyzov, Maksym Shevchenko, Siyu Cheng, Peter C. Hayes, Evgueni Jak
Summary: Phase equilibria of the CuO0.5 -AlO1.5-SiO2 system with metallic copper were investigated using equilibration, quenching technique, and electron probe X-ray microanalysis (EPMA). The study revealed the liquidus of the CuO0.5 -AlO1.5-SiO2 system, including two 2-liquid miscibility gaps and various primary phase fields. A thermodynamic model with self-consistent parameters was established based on new experimental data and existing literature. The liquidus projection of the CuO0.5 -AlO1.5-SiO2 system under different temperatures and compositions was presented for the first time. It was observed that the presence of a small amount of alumina and copper oxide (CuAlO2) stabilized cristobalite over tridymite at low temperatures.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Siyu Cheng, Maksym Shevchenko, Peter C. Hayes, Evgueni Jak
Summary: The C(A,F)3 phase is stable over a wide range of temperatures (1213-1400°C) and alumina compositions (3.3-33.6 mol pct AlO1.5) in the FeO-Fe2O3-CaO-Al2O3 system. The isostructural solid-phase C(2)F3A (2CaO•3Fe2O3•Al2O3) has been found to be stable up to 1225°C in the same system.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
A. Zadesenets, Yu Shubin, S. Korenev
Summary: The binary phase diagram of the Ir-Pt system was reinvestigated in the subsolidus region. The use of porous nanosized samples and the double-sided approach allowed for the determination of the true equilibrium state of solid solutions in the miscibility gap region. The boundaries of the miscibility gap were found to be lower than previously estimated, with the critical point position estimated to be around 790 degrees Celsius at 55 at% Pt. This approach can be applied to investigate other refractory metal binary systems.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Thermodynamics
Yueshan Jiang, Yu Zhang, Dekui Zhang, Yanlin He, Weisen Zheng, Rendong Liu
Summary: This study investigated the high-temperature phase stability of Fe-Zr binary alloy using the CALPHAD approach combined with an experimental study. The Fe23Zr6 phase in the Fe-Zr system was recognized as a stable phase after annealing and its stability was affected by factors such as cooling rate and annealing time. Experimental results showed that the Fe23Zr6 phase precipitates more under longer annealing time and faster cooling rate.
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
(2022)
Article
Materials Science, Ceramics
Georgii Khartcyzov, Maksym Shevchenko, Siyu Cheng, Peter C. Hayes, Evgueni Jak
Summary: This study provides fundamental information on the reactions between slags and refractory materials in metallurgical furnaces through the phase equilibria studies of the CuO0.5-CaO-SiO2 system. The experimental determination of phase compositions and liquidus surface of the system contributes to the optimization of thermodynamic database for copper-containing systems.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Guillaume Deffrennes, Bruno Gardiola, Erwann Jeanneau, Georges Mikaelian, Pierre Benigni, Alain Pasturel, Alexander Pisch, Jerome Andrieux, Olivier Dezellus
JOURNAL OF SOLID STATE CHEMISTRY
(2019)
Article
Thermodynamics
G. Deffrennes, B. Gardiola, M. Allam, D. Chaussende, A. Pisch, J. Andrieux, R. Schmid-Fetzer, O. Dezellus
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
(2019)
Article
Chemistry, Physical
S. Gambaro, F. Valenza, G. Cacciamani, M. L. Muolo, A. Passerone, F. Toche, R. Chiriac, O. Dezellus
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Thermodynamics
G. Deffrennes, B. Gardiola, M. Lomello-Tafin, A. Pasturel, A. Pisch, J. Andrieux, R. Schmid-Fetzer, O. Dezellus
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
(2019)
Article
Materials Science, Multidisciplinary
A. Pisch, A. Pasturel, G. Deffrennes, O. Dezellus, P. Benigni, G. Mikaelian
COMPUTATIONAL MATERIALS SCIENCE
(2020)
Article
Physics, Applied
C. Scheuerlein, J. Andrieux, M. Michels, F. Lackner, C. Meyer, R. Chiriac, F. Toche, M. Hagner, M. Di Michiel
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2020)
Article
Chemistry, Physical
D. Louzguine-Luzgin, K. Georgarakis, J. Andrieux, L. Hennet, T. Morishita, K. Nishio, R. Belosludov
Article
Chemistry, Physical
O. Dezellus, M. Zhe, B. Gardiola, S. Lay, J. C. Viala
Summary: Diffusion couples of Ti and biphasic alloy Al-7wt%Si were studied at different time intervals to observe the nature of the reaction layers and phase transitions. The interfacial reaction layer consisted mainly of silicides for short interaction times, transitioning to aluminides for longer times. This variation in reactions is attributed to the biphasic nature of one end-member and the high activity for both elements, illustrating the challenge of confirming a true diffusion path in diffusion couples.
JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
(2021)
Article
Chemistry, Physical
Nicolas Bouliez, Jerome Andrieux, Rodica Chiriac, Francois Toche, Jean-Claude Crivello, Bruno Gardiola, Sophie Cazottes, Florence Robaut, Rafael Cury, Olivier Dezellus
Summary: Tungsten heavy alloys (Co-Ni-W) of different compositions were prepared and heat treated, revealing a new intermetallic phase. The evolution of phase equilibria with temperature helps to achieve agreement with high temperature data.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
J. Lacaze, O. Dezellus
Summary: By utilizing literature data on iron melts, this study obtained an expression for the surface tension of cast iron melts as a function of temperature and composition, which was compared satisfactorily with reported experimental results. Furthermore, an analysis of sessile drop experiments with cast iron melts onto graphite substrates revealed the strong adhesion between these two phases in the presence of sulfur, which dramatically decreases with the addition of spheroidizers like Mg and Ce to reduce sulfur activity. Finally, the analysis and discussion of impurity and trace element segregation at the graphite matrix interface in cast irons led to a proposed scheme for their effect on graphite shape.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Metallurgy & Metallurgical Engineering
A. Regordosa, J. Sertucha, U. de la Torre, J. Lacaze, M. J. Castro-Roman, O. Dezellus
Summary: The determination of silicon and carbon contents by thermal analysis based on recording the cooling curve of a melt. However, experimental values show undercoolings compared to the equilibrium metastable phase diagram. For different alloy compositions and temperatures, individual relationships for austenite liquidus and metastable eutectic need to be determined.
INTERNATIONAL JOURNAL OF METALCASTING
(2023)
Article
Materials Science, Multidisciplinary
T. J. Manescau, J. Braun, O. Dezellus
Summary: This study explores the Co-free high entropy alloy matrix for Stellite (Co-Cr) substitution in nuclear applications and identifies the potential existence of a Co-free HEA with comparable or superior intrinsic lattice strength to the classical Cantor alloy.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Metallurgy & Metallurgical Engineering
Olivier Dezellus, Bruno Jacques, Jacques Lacaze, Camille Nous
Summary: This paper introduces a novel technique to study secondary wetting in bimetallic systems with nearly perfect primary wetting, by promoting complete dissociation between primary and secondary wettings. Evidence is obtained for the first time that secondary wetting occurs in aluminum alloys.
CANADIAN METALLURGICAL QUARTERLY
(2021)
