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A new model for thermal conductivity of“continuous matrix/dispersed and separated 3D-particles”type composite materials and its application to WC-M(M=Co,Ag)systems

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Journal of Materials Science & Technology 2022年第2期97卷 123-133页

作者： Shiyi Wen Yong Du Jing Tan Yuling Liu Peng Zhou Jianzhan Long george kaptay State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Hunan Provincial Key Defense Laboratory of High Temperature Wear-Resisting Materials and Preparation Technology Hunan University of Science and TechnologyXiangtan 411201China State Key Laboratory of Cemented Carbide Zhuzhou 412000China University of Miskolc MiskolcEgyetemváros3515Hungary

In the present work a new thermal conductivity model is developed for two-phase composite materials,which are consisted of a continuous matrix and dispersed 3 D-particles separated from each other by the matrix as a function of grain size and volume ratio of the dispersed particles at different *** model is applied to reproduce experimental thermal conductivity values of cemented carbide systems WC-Co and *** agreement was found between measured thermal conductivity data originating from both this work and recent literature and the calculated ones only using semi-empirical parameters for the interfacial thermal resistance(ITR)values at WC/Co,WC/Ag and WC/WC interfaces as a function of ***,the temperature and grain size dependence of the thermal conductivity for WC is established for the first *** model works well for the case when the matrix(Ag)has a higher thermal conductivity compared to that of the WC particles and also for the case when the matrix(Co)has a lower thermal conductivity compared to that of the WC *** new model forms a physically sound basis for further development/materials design of cemented carbides and particlereinforced composite materials.

关键词： Thermal conductivity WC-Co WC-Ag Modeling Cemented carbides Composite materials

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维普期刊数据库

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A new model to describe composition and temperature dependence of thermal conductivity for solution phases in binary alloys

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Journal of Materials Science & Technology 2020年第24期59卷 72-82页

作者： Shiyi Wen Yuling Liu george kaptay Yong Du State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China University of Miskolc MiskolcEgyetemvaros3515Hungary

Modelling temperature-and composition-dependent thermal conductivity in alloys is challengeable and is seldom studied *** the present work,a new model is developed to describe the temperature and concentration dependence of thermal conductivity for binary *** this new model,firstly thermal conductivity of pure metals was modelled as the function of temperature for each phase and each magnetic state by the corresponding physically sound ***,in order to describe the composition and temperature dependence of thermal conductivity for solid phases,the combination of the theories of Nordheim and Mott for electric conductivity of alloys with the Wiedemann-Franz law was ***,the reliability of the new model was verified by presently measured thermal conductivities for pure Co,Ni and Co-Ni alloys at 300,600,900 and 1100 K as well as for binary Al-Zn,Mg-Zn and U-Zr systems using the data taken from the *** calculated thermal conductivities can well reproduce the measured ones in one-phase regions of a series of Co-Ni *** thermal conductivity in a two-phase region of the Co-Ni system is reasonably predicted as *** is demonstrated that the new model can be utilized to evaluate the thermal conductivity over the whole investigated composition and temperature ranges for the first time and is expected to be extended to ternary and multicomponent systems by CALPHAD method,which contributes significantly to the development of computational design of materials.

关键词： Thermal conductivity Co-Ni alloys CALPHAD method Measurement Modelling

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维普期刊数据库

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CALTPP:A general program to calculate thermophysical properties

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Journal of Materials Science & Technology 2020年第7期42卷 229-240页

作者： Yuling Liu Cong Zhang Changfa Du Yong Du Zhoushun Zheng Shuhong Liu Lei Huang Shiyi Wen Youliang Jin Huaqing Zhang Fan Zhang george kaptay State Key Lab of Powder Metallurgy Central South UniversityChangshaHunan 410083China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Mathematics and Statistics Central South UniversityChangshaHunan 410083China School of Materials Science and Engineering Xiangtan UniversityXiangtanHunan 411105China Department of Nanotechnology University of MiskolcH-3515 MiskolcEgyetemvarosHungary

A program CALTPP(CALculation of ThermoPhysical Properties)is developed in order to provide various thermophysical properties such as diffusion coefficient,interfacial energy,thermal conductivity,viscosity and molar volume mainly as function of temperature and *** thermophysical properties are very important inputs for microstructure simulations and mechanical property *** general structure of CALTPP is briefly described,and the CALPHAD-type models for the description of these thermophysical properties are *** CALTPP program contains the input module,calculation and/or optimization modules and output module.A few case studies including(a)the calculation of diffusion coefficient and optimization of atomic mobility,(b)the calculation of solid/liquid,coherent solid/solid and liquid/liquid interfacial energies,(c)the calculation of thermal conductivity,(d)the calculation of viscosity,and(e)the establishment of molar volume database in binary and ternary alloys are demonstrated to show the features of *** is expected that CALTPP will be an effective contribution in both scientific research and education.

关键词： Thermophysical property Diffusion coefficient Interfacial energy Thermal conductivity Viscosity Molar volume CALPHAD-type modeling

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维普期刊数据库

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