Thermodynamic database of the phase diagrams in copper base alloy systems

通讯作者地址: Ishida, K (通讯作者), Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Aoba Yama 02, Sendai, Miyagi 9808579 Japan 地址: 1. Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579 Japan 2. Xiamen Univ, Dept Mat Sci & Engn, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] thermodynamic database on the phase equilibria of the copper base alloys, including Cu-X binary system and Cu-Fe, Cu-Ni, Cu-Cr base ternary systems has been developed by the Calculation of Phase Diagrams (CALPHAD) method. The thermodynamic parameters describing Gibbs energies of the different phases have been evaluated by optimizing experimental data of phase equilibria and thermodynamic properties. The present thermodynamic database can provide much information such as stable and metastable phase equilibria, phase fraction, liquidus projection and various thermodynamic quantities and so on, which is expected to play an important role in the design of copper base alloys. (c) 2004 Elsevier Ltd. All rights reserved

Thermodynamic calculation of phase equilibria in the Cu-Ni-Zn system

通讯作者地址: Jiang, M (通讯作者), Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579 Japan 地址: 1. Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579 Japan 2. Xiamen Univ, Dept Mat Sci & Engn, Xiamen 361005, Peoples R China 3. Univ Sofia, Fac Chem, Sofia 1164, Bulgaria 电子邮件地址: [email protected] ternary system of Cu-Ni-Zn has been thermodynamically analyzed based on extensive experimental information and reasonable thermodynamic modeling work by using the CALPHAD approach. A self-consistent set of thermodynamic parameters has been obtained, and the experimentally determined phase equilibria in the whole composition range except for the Zn-rich portion have been critically reproduced. The thermodynamic description established in this work can be used in predicting the phase relationships and thermodynamic properties in the Cu-Ni-Zn system. (c) 2004 Elsevier Ltd. All rights reserved

Experimental determination and thermodynamic calculation of the phase equilibria in the Cu-Cr-Nb and Cu-Cr-Co systems

通讯作者地址: Wang, CP (通讯作者), Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, 422 Siming S Rd, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, Res Ctr Mat Design & Applicat, Xiamen 361005, Peoples R China 3. Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579 Japan 电子邮件地址: [email protected] equilibria in the Cu-Cr-Nb and Cu-Cr-Co systems were, respectively, determined by metallography, X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive X-ray (SEM-EDX) techniques. The thermodynamic assessments of the Cu-Cr-Nb and Cu-Cr-Co systems were carried out by using CALPHAD (CALculation of PHAse Diagrams) method on the basis of the experimental data measured by the present and previous works. The Gibbs free energies of the liquid and solid solution phases were described by the subregular solution model, and those of intermetallic compounds were described by the sublattice model. A consistent set of the thermodynamic parameters has been obtained, and the evaluated thermodynamic parameters lead to a better fit between calculated results and experimental data in both the Cu-Cr-Nb and Cu-Cr-Co systems. (C) 2008 Elsevier B.V. All rights reserved.National Natural Science Foundation of China 50425101 50771088 Ministry of Education, PR China 20050384003 707037 Core Research for Evolutional Science, and Technology (CREST) Japan Science and Technology Agency (JST

Thermodynamic assessments of the Ag-Tb and Ag-Ho systems

通讯作者地址: Liu, XJ (通讯作者), Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, Res Ctr Mat Design & Applicat, Xiamen 361005, Peoples R China 3. Xiamen Univ, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 4. Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400045, Peoples R China 5. Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579 Japan 电子邮件地址: [email protected] phase diagrams and thermodynamic properties in the Ag-Tb and Ag-Ho binary systems have been assessed by using the CALPHAD (Calculation of Phase Diagrams) method on the basis of the experimental data including the thermodynamic properties and phase equilibria. The Gibbs free energies of the liquid, bcc, fcc and hcp phases were described by the substitution solution model with excess energy expressed by Redlich-Kister polynomial, and those of intermetallic compounds (Ag2Tb, AgTb, Ag2Ho and AgHo phases) were treated as stoichiometric compounds, and Ag51Tb14 and Ag51Ho14 phases were modeled by the sublattice model in these two binary systems. The thermodynamic parameters of each phase in the Ag-Tb and Ag-Ho binary systems were obtained, and an agreement between the calculated results and experimental data was obtained in each binary system. (C) 2009 Elsevier B.V. All rights reserved.National Natural Science Foundation of China 50425101 50771087 50771088 50725413 Ministry of Education, PR China 707037 National Basic Research Program of China 2007CB613704 Japan Science and Technology Agency (JST

Thermodynamic assessments of the Ag-Er and Er-Y systems

通讯作者地址: Liu, XJ (通讯作者), Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, Res Ctr Mat Design & Applicat, Xiamen 361005, Peoples R China 3. Longyan Univ, Coll Chem & Mat Sci, Longyan 364000, Fujian Peoples R China 4. Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400045, Peoples R China 5. Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579 Japan 电子邮件地址: [email protected] phase diagrams and thermodynamic properties in the Ag-Er and Er-Y binary systems have been assessed by using the CALPHAD (Calculation of Phase Diagrams) method on the basis of the experimental data including the thermodynamic properties and phase equilibria. The Gibbs free energies of the liquid, bcc, fcc, and hcp phases were described by the subregular solution model with the Redlich-Kister equation, and those of intermetallic compounds (Ag2Er and AgEr phases) were treated as stoichiometric compounds, and Ag51Er14 phase was modeled by the sublattice model in the Ag-Er binary system. The thermodynamic parameters of the Ag-Er and Er-Y binary systems were obtained, and an agreement between the calculated results and experimental data was obtained for each binary system. (C) 2009 Elsevier B.V. All rights reserved.National Natural Science Foundation of China 50425101 50771087 50771088 50725413 Ministry of Education, PR China 707037 National Basic Research Program of China 2007CB613704 Japan Science and Technology Agency (JST