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Thermodynamic Description of Ternary Fe-B-X Systems. Part 9: Fe-B-Cu

Miettinen Jyrki, Visuri Ville-Valtteri, Fabritius Timo

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 1

297--304

EN

Thermodynamic descriptions of the ternary Fe-B-Cu system and its binary sub-system B-Cu aredeveloped in the context of a new Fe-B-X (X = Cr, Cu, Mn, Mo, Ni, Si, Ti, V, C) database. The thermodynamic parameters of the other binary sub-systems (Fe-B and Fe-Cu) are taken from earlier assessments. Experimental thermodynamic and phase equilibrium data available in the literature have been used for the optimization of the Fe-B-Cu and B-Cu systems’ thermodynamic parameters. The solution phases are described using a substitutional solution model and the compounds (two borides of the Fe-B system) are treated as stoichiometric phases. A good agreement was obtained between the calculated and the experimental thermodynamic and phase equilibrium data.

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Thermodynamic Description of Ternary Fe-B-X Systems. Part 8: Fe-B-Mo, with Extension to Quaternary Fe-B-Cr-Mo System

Miettinen Jyrki, Visuri Ville-Valtteri, Fabritius Timo

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 1

281--295

EN

Thermodynamic optimizations of the ternary Fe-B-Mo system and its binary sub-system B-Mo are presented. The Fe-B-Mo description is then extended to the quaternary Fe-B-Cr-Mo system by assessing the ternary B-Cr-Mo system. The thermodynamic descriptions of the other binaries (Fe-B, Fe-Cr, Fe-Mo, B-Cr, and Cr-Mo) and the other ternaries (Fe-B-Cr and Fe-Cr-Mo) are taken from earlier studies. In this study, the adjustable parameters of the B-Mo, Fe-B-Mo, and B-Cr-Mo systems were optimized using the experimental thermodynamic and the phase equilibrium data from the literature. The solution phases of the system (liquid, bcc and fcc) are described with the substitutional solution model, and most borides are treated as stoichiometric phases or semistoichiometric phases, using a simple two-sublattice model for the latter. The system’s intermetallic phases, Chi, Mu, R, and Sigma (not dissolving boron) as well as boride M3B2, based on a formulation of (Cr,Fe)(Cr,Fe,Mo)2(B)2, are described with a three-sublattice model. Reasonable agreement is obtained between the calculated and measured phase equilibria in all four systems: B-Mo; Fe-B-Mo; B-Cr-Mo; and Fe-B-Cr-Mo.

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Thermodynamic Description of Ternary Fe-B-X Systems. Part 7: Fe-B-C

Miettinen J., Visuri V.-V., Fabritius T., Vassilev G.

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 2

923--933

EN

Thermodynamic description of the Fe-B-C system in its iron-rich corner is developed in the context of a new Fe-B-X (X = Cr, Ni, Mn, Si, Ti, V, C) database. The thermodynamic parameters of the binary sub-systems, Fe-B, Fe-C and B-C, are taken from earlier assessments modifying the B-C description. The parameters of the Fe-B-C system are optimized in this study using experimental thermodynamic and phase equilibrium data from the literature. Liquid, beta-rhombo-B and graphite phases are described using the substitutional solution model, while the ferrite (bcc), the austenite (fcc), the cementite (M3C) and the M23C6 phases are described with the sublattice model and the borides, Fe2B, FeB and B4C, are treated as stoichiometric phases. A good correlation was obtained between the calculated and the experimental thermodynamic and phase equilibrium data. The description is recommended to be used at the composition region of wt% C + wt% B < 15 and at temperatures below 2700°C.

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Aktualny status i problemy Akcji COST 531 : materiały na luty bezołowiowe

Zabdyr L. A.

Elektronika : konstrukcje, technologie, zastosowania

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2005

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Vol. 46, nr 9

11-12

PL

Podano w skrócie genezę Akcji COST 531, z uwzględnieniem w niej udziału polskich naukowcow. Następnie podano strukturę organizacyjną Akcji i jej odniesienie do nowoczesnych sposobów projektowania materiałów, ilustrując to konkretnym przykładem. Wreszcie opisano w koniecznym skrócie podstawy metody CALPHAD, jako głównego narzędzia przy sporządzaniu termodynamicznej bazy danych.

EN

The origin of COST 531 Action was outlined, as wall as the contribution of Polish scientists. The structure of the Action and its relation to knowledge-based material design is also described, and the example of such an approach is given. The outlines of the CALPHAD method are then presented as the main tool for thermodynamic database production.