Pub Date : 2024-12-12DOI: 10.1016/j.calphad.2024.102790
Markus Führer , Sabine Zamberger , Erwin Povoden-Karadeniz
Differential Scanning Calorimetry measurements are performed with a subsequent postprocessing routine specially designed for dilute systems, aiming at the evaluation of the solvus temperature of AlN in seven microalloyed steel laboratory melts. Computer-aided EDS particle analysis of the steel microstructure confirms the DSC results. With this consistent set of new data directly related to observed AlN stability, coupled with critically assessed thermodynamic data from the literature, the thermodynamic description of the AlN phase is reconsidered.
{"title":"Experimental determination of AlN in microalloyed steel and thermodynamic analysis","authors":"Markus Führer , Sabine Zamberger , Erwin Povoden-Karadeniz","doi":"10.1016/j.calphad.2024.102790","DOIUrl":"10.1016/j.calphad.2024.102790","url":null,"abstract":"<div><div>Differential Scanning Calorimetry measurements are performed with a subsequent postprocessing routine specially designed for dilute systems, aiming at the evaluation of the solvus temperature of AlN in seven microalloyed steel laboratory melts. Computer-aided EDS particle analysis of the steel microstructure confirms the DSC results. With this consistent set of new data directly related to observed AlN stability, coupled with critically assessed thermodynamic data from the literature, the thermodynamic description of the AlN phase is reconsidered.</div></div>","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":"88 ","pages":"Article 102790"},"PeriodicalIF":1.9,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-05DOI: 10.1016/j.calphad.2024.102774
Ondřej Zobač , David Novák , Jana Pavlů , Martin Friák , Aleš Kroupa
The binary phase diagram of the Fe-Se system was modeled by the thermodynamic CALPHAD approach for the first time. The thermodynamic description of this system was mainly based on the available experimental isobaric molar heat capacity of the Fe1.042Se (β) phase in the temperature range of 25–777 °C and on the published proposed experimental phase diagrams. The formation enthalpies of Fe1.042Se (β), Fe7Se8, Fe3Se4, FeSe (δ) and FeSe2 phases at 25 °C were also implemented into the phase diagram modeling. Magnetic properties and formation energy of the Fe3Se4 (γ) phase were theoretically calculated by ab initio methods and implemented in the assessment.
{"title":"Thermodynamic study of binary phase diagram iron-selenium","authors":"Ondřej Zobač , David Novák , Jana Pavlů , Martin Friák , Aleš Kroupa","doi":"10.1016/j.calphad.2024.102774","DOIUrl":"10.1016/j.calphad.2024.102774","url":null,"abstract":"<div><div>The binary phase diagram of the Fe-Se system was modeled by the thermodynamic CALPHAD approach for the first time. The thermodynamic description of this system was mainly based on the available experimental isobaric molar heat capacity of the Fe<sub>1.042</sub>Se (β) phase in the temperature range of 25–777 °C and on the published proposed experimental phase diagrams. The formation enthalpies of Fe<sub>1.042</sub>Se (β), Fe<sub>7</sub>Se<sub>8</sub>, Fe<sub>3</sub>Se<sub>4</sub>, FeSe (δ) and FeSe<sub>2</sub> phases at 25 °C were also implemented into the phase diagram modeling. Magnetic properties and formation energy of the Fe<sub>3</sub>Se<sub>4</sub> (γ) phase were theoretically calculated by ab initio methods and implemented in the assessment.</div></div>","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":"88 ","pages":"Article 102774"},"PeriodicalIF":1.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/j.calphad.2024.102731
Zhongwen Shi , Genfeng Shang , Xiao-Gang Lu
{"title":"Corrigendum to “Thermodynamic assessment of the Ni-Co-Re system and diffusion study of its fcc phase” [Calphad 85 (2024) 102688]","authors":"Zhongwen Shi , Genfeng Shang , Xiao-Gang Lu","doi":"10.1016/j.calphad.2024.102731","DOIUrl":"10.1016/j.calphad.2024.102731","url":null,"abstract":"","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":"87 ","pages":"Article 102731"},"PeriodicalIF":1.9,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/j.calphad.2024.102756
H. Bouchta , N. Selhaoui , D.O. Poletaev , M.A. Boukideur , A. Bendarma , S. Kardellass , A. Marjaoui , M. Zanouni , A. Khadija
{"title":"Corrigendum to “Thermodynamic assessment of the Ce-Rh system by the combination of ab-initio calculations and the CALPHAD approach” [Calphad 87 (2024) 102747]","authors":"H. Bouchta , N. Selhaoui , D.O. Poletaev , M.A. Boukideur , A. Bendarma , S. Kardellass , A. Marjaoui , M. Zanouni , A. Khadija","doi":"10.1016/j.calphad.2024.102756","DOIUrl":"10.1016/j.calphad.2024.102756","url":null,"abstract":"","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":"87 ","pages":"Article 102756"},"PeriodicalIF":1.9,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-26DOI: 10.1016/j.calphad.2024.102777
Shu Li , Wenjie Wei , Kaiqing Zhang , Minkai Tan , Boya Zhang , Zhanmin Cao , Na Wang
Calcium antimonates with fluorescence characteristic are potential candidates for lighting and display devices. Their thermodynamic properties were investigated using both experiments and first-principles calculations in this study. High-purity CaSb2O6 and Ca2Sb2O7 were synthesized via solid-state sintering in air. Their structure Rietveld refinement, microstructure, and elemental valence states were conducted. Heat capacities at high temperature were precisely measured using a MHTC 96 Line calorimeter. The fitting equation are as follows: Cp (CaSb2O6) = 218.807 3.370 10−3T 4.770 106/T2, Cp(Ca2Sb2O7) = 265.610 1.024 10−2T 4.985 106/T2, respectively. The enthalpies of formation (−1892.060 kJ mol−1 and -2576.297 kJ mol−1), entropies (163.045 J mol−1 K−1 and 218.973 J mol−1 K−1) at 298 K, and low temperature (0–298 K) heat capacities were obtained through first-principles calculations based on density functional theory (DFT) combined with phonon calculations. Furthermore, the thermal expansion coefficient of Ca2Sb2O7 is significantly higher than that of CaSb2O6 during the heating process. Their Gibbs energy were also estimated, at 298 K, Ca2Sb2O7 exhibits a negative value of −701.178 kJ mol−1 relative to CaSb2O6.
{"title":"Thermodynamic properties of calcium antimonates from experiments and first principles","authors":"Shu Li , Wenjie Wei , Kaiqing Zhang , Minkai Tan , Boya Zhang , Zhanmin Cao , Na Wang","doi":"10.1016/j.calphad.2024.102777","DOIUrl":"10.1016/j.calphad.2024.102777","url":null,"abstract":"<div><div>Calcium antimonates with fluorescence characteristic are potential candidates for lighting and display devices. Their thermodynamic properties were investigated using both experiments and first-principles calculations in this study. High-purity CaSb<sub>2</sub>O<sub>6</sub> and Ca<sub>2</sub>Sb<sub>2</sub>O<sub>7</sub> were synthesized via solid-state sintering in air. Their structure Rietveld refinement, microstructure, and elemental valence states were conducted. Heat capacities at high temperature were precisely measured using a MHTC 96 Line calorimeter. The fitting equation are as follows: <em>C</em><sub><em>p</em></sub> (CaSb<sub>2</sub>O<sub>6</sub>) = 218.807 <span><math><mrow><mo>+</mo></mrow></math></span> 3.370<span><math><mrow><mo>×</mo></mrow></math></span> 10<sup>−3</sup><em>T</em> <span><math><mrow><mo>−</mo></mrow></math></span> 4.770<span><math><mrow><mo>×</mo></mrow></math></span> 10<sup>6</sup>/<em>T</em><sup>2</sup>, <em>C</em><sub><em>p</em></sub>(Ca<sub>2</sub>Sb<sub>2</sub>O<sub>7</sub>) = 265.610 <span><math><mrow><mo>+</mo></mrow></math></span> 1.024<span><math><mrow><mo>×</mo></mrow></math></span> 10<sup>−2</sup><em>T</em> <span><math><mrow><mo>−</mo></mrow></math></span> 4.985<span><math><mrow><mo>×</mo></mrow></math></span> 10<sup>6</sup>/<em>T</em><sup>2</sup>, respectively. The enthalpies of formation (−1892.060 kJ mol<sup>−1</sup> and -2576.297 kJ mol<sup>−1</sup>), entropies (163.045 J mol<sup>−1</sup> K<sup>−1</sup> and 218.973 J mol<sup>−1</sup> K<sup>−1</sup>) at 298 K, and low temperature (0–298 K) heat capacities were obtained through first-principles calculations based on density functional theory (DFT) combined with phonon calculations. Furthermore, the thermal expansion coefficient of Ca<sub>2</sub>Sb<sub>2</sub>O<sub>7</sub> is significantly higher than that of CaSb<sub>2</sub>O<sub>6</sub> during the heating process. Their Gibbs energy were also estimated, at 298 K, Ca<sub>2</sub>Sb<sub>2</sub>O<sub>7</sub> exhibits a negative value of −701.178 kJ mol<sup>−1</sup> relative to CaSb<sub>2</sub>O<sub>6</sub>.</div></div>","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":"87 ","pages":"Article 102777"},"PeriodicalIF":1.9,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-21DOI: 10.1016/j.calphad.2024.102769
Hyo-Sun Jang , Jin-Woong Lee , Byung Do Lee , Kee-Sun Sohn , Jiwon Park , Chang-Seok Oh
BCC-based refractory complex concentrated alloys (RCCAs) are attracting attention as high-temperature materials because of their exceptional strength at high temperatures, but suffer from low tensile ductility. To search for alloys with improved ductility, it is necessary to investigate the properties of RCCA systems thoroughly, however, an experimental investigation of these vast constitutional spaces is impractical. This study employed data-driven approaches that combined first-principles calculations with machine learning. We first calculated the lattice parameters and elastic constants of 1693 ternary RCCAs, subsets of RCCAs alloys consisting of Ti, Zr, Hf, Nb, Mo, V, Ta, and W, using the exact muffin-tin orbitals method with coherent potential approximation (EMTO-CPA), and generated ductility-related parameters, including Pugh's ratio, Poisson's ratio, and Cauchy pressure. Machine learning models that could predict the three parameters were searched and trained using the generated data. Subsequently, an inverse design based on optimization algorithms was performed to identify optimal alloy systems with high Pugh's ratios. The ductility of the searched alloys was verified by calculating Pugh's ratio using EMTO-CPA, followed by thermodynamic calculations to investigate their structural stability.
{"title":"Exploration of high-ductility ternary refractory complex concentrated alloys using first-principles calculations and machine learning","authors":"Hyo-Sun Jang , Jin-Woong Lee , Byung Do Lee , Kee-Sun Sohn , Jiwon Park , Chang-Seok Oh","doi":"10.1016/j.calphad.2024.102769","DOIUrl":"10.1016/j.calphad.2024.102769","url":null,"abstract":"<div><div>BCC-based refractory complex concentrated alloys (RCCAs) are attracting attention as high-temperature materials because of their exceptional strength at high temperatures, but suffer from low tensile ductility. To search for alloys with improved ductility, it is necessary to investigate the properties of RCCA systems thoroughly, however, an experimental investigation of these vast constitutional spaces is impractical. This study employed data-driven approaches that combined first-principles calculations with machine learning. We first calculated the lattice parameters and elastic constants of 1693 ternary RCCAs, subsets of RCCAs alloys consisting of Ti, Zr, Hf, Nb, Mo, V, Ta, and W, using the exact muffin-tin orbitals method with coherent potential approximation (EMTO-CPA), and generated ductility-related parameters, including Pugh's ratio, Poisson's ratio, and Cauchy pressure. Machine learning models that could predict the three parameters were searched and trained using the generated data. Subsequently, an inverse design based on optimization algorithms was performed to identify optimal alloy systems with high Pugh's ratios. The ductility of the searched alloys was verified by calculating Pugh's ratio using EMTO-CPA, followed by thermodynamic calculations to investigate their structural stability.</div></div>","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":"87 ","pages":"Article 102769"},"PeriodicalIF":1.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.calphad.2024.102771
A. Vickerfält , J. Huss , J. Martinsson , D. Sichen
The pseudo-ternary Al2O3-SiO2-“V2O3” phase diagram was studied at 1873 K and oxygen partial pressures of 3.4 × 10−11, 3.3 × 10−10 and 3.4 × 10−9 atm. The samples were kept in a CO-CO2 mixture to control the oxygen potential and quenched in oil after equilibration. The phase compositions of the quenched samples were analyzed using wavelength-dispersive spectroscopy. The analyses were used to construct the phase diagrams. A change in oxygen potential did not profoundly affect the Al2O3-corundum + V2O3-corundum + mullite and V2O3-corundum + liquid + cristobalite equilibria, in contrast to the V2O3-corundum + mullite + liquid equilibrium where an effect was evident. For the latter equilibrium, decreased oxygen potential resulted in higher contents of Al2O3 and slightly higher contents of V2O3 in the liquid phase, as well as slightly higher contents of Al2O3 in V2O3-corundum and mullite.
{"title":"The Al2O3-SiO2-“V2O3” phase diagram at 1873 K","authors":"A. Vickerfält , J. Huss , J. Martinsson , D. Sichen","doi":"10.1016/j.calphad.2024.102771","DOIUrl":"10.1016/j.calphad.2024.102771","url":null,"abstract":"<div><div>The pseudo-ternary Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-“V<sub>2</sub>O<sub>3</sub>” phase diagram was studied at 1873 K and oxygen partial pressures of 3.4 × 10<sup>−11</sup>, 3.3 × 10<sup>−10</sup> and 3.4 × 10<sup>−9</sup> atm. The samples were kept in a CO-CO<sub>2</sub> mixture to control the oxygen potential and quenched in oil after equilibration. The phase compositions of the quenched samples were analyzed using wavelength-dispersive spectroscopy. The analyses were used to construct the phase diagrams. A change in oxygen potential did not profoundly affect the Al<sub>2</sub>O<sub>3</sub>-corundum + V<sub>2</sub>O<sub>3</sub>-corundum + mullite and V<sub>2</sub>O<sub>3</sub>-corundum + liquid + cristobalite equilibria, in contrast to the V<sub>2</sub>O<sub>3</sub>-corundum + mullite + liquid equilibrium where an effect was evident. For the latter equilibrium, decreased oxygen potential resulted in higher contents of Al<sub>2</sub>O<sub>3</sub> and slightly higher contents of V<sub>2</sub>O<sub>3</sub> in the liquid phase, as well as slightly higher contents of Al<sub>2</sub>O<sub>3</sub> in V<sub>2</sub>O<sub>3</sub>-corundum and mullite.</div></div>","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":"87 ","pages":"Article 102771"},"PeriodicalIF":1.9,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-19DOI: 10.1016/j.calphad.2024.102773
Taibai Fu , Yuling Liu , Huixin Liu , Changfa Du , Shiyi Wen , Yong Du
Accurate diffusivities in fcc Ni–Fe–Mo alloys are of significant importance in designing high-quality magnetic alloys. In this work, totally twelve fcc single-phase diffusion couples are assembled to determine the diffusivities of fcc Ni–Fe–Mo alloys at 1373, 1423 and 1437 K. The diffusivity matrices at the intersection compositions of diffusion paths are determined by the Matano-Kirkaldy method. In addition, the diffusivity matrices along the whole composition profiles of individual diffusion couple and the atomic mobilities of fcc Ni–Fe–Mo alloys are evaluated by the numerical inverse approach incorporated in CALTPP program. The reliability of the obtained atomic mobilities is verified by comparing the predicted diffusion behaviors with the experimental ones. Furthermore, applying the presently obtained atomic mobilities in combination with thermodynamic descriptions, the three-dimensional maps of interdiffusivites, activation energy and frequency-factor planes of fcc Ni–Fe–Mo alloys are constructed to display the composition- and temperature-dependent diffusion properties. The presently obtained diffusivities and atomic mobilities of the Ni–Fe–Mo fcc phase are expected to contribute to high-efficiency Ni–Fe–Mo magnetic alloy design.
{"title":"Interdiffusivity matrices and atomic mobilities in fcc Ni–Fe–Mo alloys: Experiment and modeling","authors":"Taibai Fu , Yuling Liu , Huixin Liu , Changfa Du , Shiyi Wen , Yong Du","doi":"10.1016/j.calphad.2024.102773","DOIUrl":"10.1016/j.calphad.2024.102773","url":null,"abstract":"<div><div>Accurate diffusivities in fcc Ni–Fe–Mo alloys are of significant importance in designing high-quality magnetic alloys. In this work, totally twelve fcc single-phase diffusion couples are assembled to determine the diffusivities of fcc Ni–Fe–Mo alloys at 1373, 1423 and 1437 K. The diffusivity matrices at the intersection compositions of diffusion paths are determined by the Matano-Kirkaldy method. In addition, the diffusivity matrices along the whole composition profiles of individual diffusion couple and the atomic mobilities of fcc Ni–Fe–Mo alloys are evaluated by the numerical inverse approach incorporated in CALTPP program. The reliability of the obtained atomic mobilities is verified by comparing the predicted diffusion behaviors with the experimental ones. Furthermore, applying the presently obtained atomic mobilities in combination with thermodynamic descriptions, the three-dimensional maps of interdiffusivites, activation energy and frequency-factor planes of fcc Ni–Fe–Mo alloys are constructed to display the composition- and temperature-dependent diffusion properties. The presently obtained diffusivities and atomic mobilities of the Ni–Fe–Mo fcc phase are expected to contribute to high-efficiency Ni–Fe–Mo magnetic alloy design.</div></div>","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":"87 ","pages":"Article 102773"},"PeriodicalIF":1.9,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-18DOI: 10.1016/j.calphad.2024.102766
Siqi Wang , Wei Yu , Ying Ran , Jingxian Hu , Xinming Wang , Zhi Li , Fucheng Yin , Ya Liu
The phase relations of the Al-Cr-Pd ternary system above 1100 °C and the thermodynamic description were lacking to guide the compositional design of the Cr and Pd co-modified aluminide coating. Herein, the isothermal section of the Al-Cr-Pd ternary system at 1150 °C was experimentally determined through scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy and X-ray diffraction. In addition, a thermodynamic description of the ternary system was established by the application of CALPHAD (CALculation of PHAse Diagrams) technique based on the experimental results of the isothermal section at 930, 970, 990, 1020 and 1150 °C. The solidification paths of typical alloys determined in the previous literature were also fitted. A set of self–consistent thermodynamic parameters for the Al-Cr-Pd ternary system was obtained with a reasonable agreement between the experimental and calculated results. The results provide a basis for the compositional design of aluminide coatings and enrich the Al-based database.
1100 °C以上铝-铬-钯三元体系的相关系和热力学描述缺乏对铬和钯共改性铝涂层成分设计的指导。本文通过扫描电子显微镜、能量色散 X 射线光谱和 X 射线衍射，实验测定了铝-铬-钯三元体系在 1150 ℃ 时的等温截面。此外，根据 930、970、990、1020 和 1150 ℃ 等温段的实验结果，应用 CALPHAD（CALculation of PHAse Diagrams）技术建立了三元体系的热力学描述。此外，还拟合了以往文献中确定的典型合金的凝固路径。得到了一组自洽的铝-铬-钯三元体系热力学参数，实验结果与计算结果之间具有合理的一致性。这些结果为铝涂层的成分设计提供了依据，并丰富了铝基数据库。
{"title":"Experimental investigation and thermodynamic calculation of the Al-Cr-Pd ternary system","authors":"Siqi Wang , Wei Yu , Ying Ran , Jingxian Hu , Xinming Wang , Zhi Li , Fucheng Yin , Ya Liu","doi":"10.1016/j.calphad.2024.102766","DOIUrl":"10.1016/j.calphad.2024.102766","url":null,"abstract":"<div><div>The phase relations of the Al-Cr-Pd ternary system above 1100 °C and the thermodynamic description were lacking to guide the compositional design of the Cr and Pd co-modified aluminide coating. Herein, the isothermal section of the Al-Cr-Pd ternary system at 1150 °C was experimentally determined through scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy and X-ray diffraction. In addition, a thermodynamic description of the ternary system was established by the application of CALPHAD (CALculation of PHAse Diagrams) technique based on the experimental results of the isothermal section at 930, 970, 990, 1020 and 1150 °C. The solidification paths of typical alloys determined in the previous literature were also fitted. A set of self–consistent thermodynamic parameters for the Al-Cr-Pd ternary system was obtained with a reasonable agreement between the experimental and calculated results. The results provide a basis for the compositional design of aluminide coatings and enrich the Al-based database.</div></div>","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":"87 ","pages":"Article 102766"},"PeriodicalIF":1.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-16DOI: 10.1016/j.calphad.2024.102770
Srečo D. Škapin , Amalija Golobič , Edith De Leon , Catalina O. Tudor , Matjaž Spreitzer , Danilo Suvorov , Miha Zakotnik
The sub-solidus phase relations in the ternary Nd-Dy-Cu system were determined for an isothermal section at 550 °C. The samples were prepared by arc-melting and subsequent annealing in a protective atmosphere for 120 h. The phases in the prepared samples were characterized by X-ray powder diffraction and scanning electron microscopy, and their composition was determined by energy-dispersive spectroscopy. The intermetallic compounds based on the Dy-Cu system are compatible with compounds based on Nd-Cu-based and exhibit a high degree of solid-state solubility. The crystal structures of the solid solutions and their transformations were determined in detail. In the Cu-rich part of the system, the compound DyCu7, which is stable above 700 °C according to literature data, was confirmed under the applied experimental conditions and is connected to NdCu6 by a tie line.
在 550 °C 等温段测定了三元钕-镝-铜体系的亚固相关系。通过 X 射线粉末衍射和扫描电子显微镜对制备的样品中的相进行了表征，并通过能量色散光谱测定了它们的成分。基于 Dy-Cu 体系的金属间化合物与基于 Nd-Cu 体系的化合物兼容，并表现出较高的固态溶解度。研究人员详细测定了固溶体的晶体结构及其转变。在该体系的富铜部分，化合物 DyCu7 在应用的实验条件下得到了证实，根据文献数据，该化合物在 700 °C 以上是稳定的，并通过一条连接线与 NdCu6 相连。
{"title":"High temperature phase relations and structure determination of solid solutions in the ternary Nd-Dy-Cu system","authors":"Srečo D. Škapin , Amalija Golobič , Edith De Leon , Catalina O. Tudor , Matjaž Spreitzer , Danilo Suvorov , Miha Zakotnik","doi":"10.1016/j.calphad.2024.102770","DOIUrl":"10.1016/j.calphad.2024.102770","url":null,"abstract":"<div><div>The sub-solidus phase relations in the ternary Nd-Dy-Cu system were determined for an isothermal section at 550 °C. The samples were prepared by arc-melting and subsequent annealing in a protective atmosphere for 120 h. The phases in the prepared samples were characterized by X-ray powder diffraction and scanning electron microscopy, and their composition was determined by energy-dispersive spectroscopy. The intermetallic compounds based on the Dy-Cu system are compatible with compounds based on Nd-Cu-based and exhibit a high degree of solid-state solubility. The crystal structures of the solid solutions and their transformations were determined in detail. In the Cu-rich part of the system, the compound DyCu<sub>7</sub>, which is stable above 700 °C according to literature data, was confirmed under the applied experimental conditions and is connected to NdCu<sub>6</sub> by a tie line.</div></div>","PeriodicalId":9436,"journal":{"name":"Calphad-computer Coupling of Phase Diagrams and Thermochemistry","volume":"87 ","pages":"Article 102770"},"PeriodicalIF":1.9,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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