Papers by Keyword: Free Energy

Paper TitlePage

Authors: N. Ralantoson, A. Hairie, F. Hairie, O.B.M. Hardouin Duparc, M. Hou, Gerard Nouet, E. Paumier
Authors: Toshiyuki Koyama
Abstract: During the last decade, the phase-field method has emerged across many fields in materials science as a powerful tool to simulate and predict complex microstructure evolutions. Since phase-field methodology has an ability to model complex microstructure changes quantitatively, it will be possible to search for the most desirable microstructure by using this method as a design simulation, i.e. through computer trial-and-error testing. In order to establish this methodology, the flexible quantitative modeling for various types of complex microstructure changes using the phase-field method must first be needed. In this study, as the typical examples for the modeling of the complex microstructure changes using phase-field method, recent simulation results for the diffusion controlled phase transformations and microstructure developments in magnetic materials are demonstrated.
Authors: Shijin Maniyath, Rahul Rajan, S.S. Vaisakh, M. Pramith, N.K. Sarath, S. Arjun Krishna, A.S. Arjun
Abstract: The objective of this work is to increase the power of the two wheeler miniature engines (100cc to 250cc) by supercharging the vehicle using the suspension system. For this purpose a design is made to extract compressed air from the suspension system. It has been successfully shown that the air can be extracted from the suspension system, stored and then fed into the engine similar to supercharger or turbocharger, and the engine power can be improved using this free energy.
Authors: M. Hou, A. Hairie, B. Lebouvier, E. Paumier, N. Ralantoson, O.B.M. Hardouin Duparc, A.P. Sutton
Authors: Anshuman Patra, Swapan Kumar Karak, Snehanshu Pal
Abstract: Mechanical alloying (MA) is a potential processing method for various equilibrium and non-equilibrium alloy phases such as supersaturated solid solution, metastable crystalline, amorphous, quasi-crystalline phases, nanostructures. Compared to conventional high temperature material processing such as melting and casting, improvement of solid solubility limit results from mechanical alloying at room temperature. The solid solubility increases with increase in milling time due to enhanced stress assisted atomic diffusion during particle refinement and reaches a saturation level at higher milling time. The extension of solid solubility is attributed to thermodynamic, dynamic or kinetic factors such as high dislocation density due to severe plastic deformation during particle refinement and enhanced diffusivity during MA. The review aims to discuss the insight of MA than other non-equilibrium processing in terms of achieving higher solubility, reasoning and mechanism of solubility improvement during MA of different alloy systems.
Authors: Gui Sheng Gan, Fang Chen, Rong Chang Zeng, Yun Fei Du, Chang Hua Du
Abstract: Based on Miedema’s model, the enthalpy of formation, excess free-energy and partial molar excess free-energy of Sn-Pb binary alloy solders were calculated. The model of the activity coefficient for each component in the solders was established. The diagrams of enthalpy of formation, free energy versus composition and activity versus composition and temperature as well as activity coefficients as a function of composition and/or temperature were drawn. And then the relationship between the activity coefficients of elements Sn/Pb in the solders and temperature was obtained. The approaches to reduction in the volatilization of lead at high temperature were proposed from the point of views that the lead pollution to environment results from its chemical activity in the solder alloys.
Authors: Ji Zhang
Abstract: This paper examines the free energy potentials of damaged solids for the construction of damage mechanics constitutive models. The physical meaning of free energy in solid mechanics is analyzed in contrast with that in traditional fields of thermodynamics; 1D stress-strain curves are used to show the relationships between various thermodynamic state functions in isothermal loading processes; and the role of plastic free energy in damage evolution is discussed both macroscopically and microscopically. It is concluded that plastic free energy, which is a macroscopic representation of some additional microscopic elastic energy, cannot do work during unloading but get released when damage takes place, constituting part of the driving force for damage evolution.
Authors: S. Mourelatos, N. Ralantoson, P. Delavignette, A. Hairie, F. Hairie, M. Hou, E. Paumier, J. Thibault, A.P. Sutton
Showing 1 to 10 of 26 Paper Titles