Entropy of microstructure
نویسنده
چکیده
Two points are made in this paper: first, energy of random structures is not determined uniquely by any finite set of the characteristics of microstructure. The information lost is characterized by entropy of microstructure; it describes the scattering of the values of energy. Therefore, entropy of microstructure is a key thermodynamic parameter in phenomenological modeling of the behavior of random structures. Second, mathematical modeling of a random structure is based on the construction of its probabilistic measure; a way to select the probabilistic measure from the experimental data is outlined. The corresponding probabilistic measure is remarkably similar to that of classical statistical mechanics, though the underlying physics is quite different. After the probabilistic measure is chosen, the entropy of microstructure can be found from the analysis of the homogenization problem. Entropy of microstructure is computed in two example problems. Applications to phenomenological modeling of work hardening are discussed. r 2007 Elsevier Ltd. All rights reserved.
منابع مشابه
Metallurgical and mechanical properties of laser cladded AlFeCuCrCoNi-WC10 high entropy alloy coating
In spite of excellent corrosion resistance, good ductility and low cost of AISI 316 austenitic stainless steel, the low hardness and poor mechanical charecteristic of material restricts its applicability in several industrial services. To improve upon mechanical properties AlFeCuCrCoNi-WC10 high-entropy alloy coatings were deposited via laser cladding on austentic stainless steel AISI 316 subst...
متن کاملThermodynamics of microstructure evolution: grain growth
It is gradually getting clear that the macroscopic description of microstructure evolution requires additional thermodynamic parameters, entropy of microstructure and temperature of microstructure. It was claimed that there is "one more law of thermodynamics": entropy of microstructure must decay in isolated thermodynamic stable systems. Such behavior is opposite to that of thermodynamic entrop...
متن کاملPhysical Properties of High Entropy Alloys
The majority of studies on high-entropy alloys are focused on their phase, microstructure, and mechanical properties. However, the physical properties of these materials are also encouraging. This paper provides a brief overview of the physical properties of high-entropy alloys. Emphasis is laid on magnetic, electrical, and thermal properties.
متن کاملAnalytical investigation of heat transfer and classical entropy generation in microreactors – The influences of exothermicity and asymmetry
Heat transfer and entropy generation are analysed theoretically in a thermal model of microreactors accommodating processes with large heat of reaction. This includes an asymmetric, thick wall, partially-filled porous microchannel under local thermal non-equilibrium. The system features exothermicity/endothermicity within the solid and fluid phases to represent heat of chemical reactions and ab...
متن کاملNanohardness and Microstructure of NiCoAlFeCu and NiCoAlFeCuCr Alloys Produced by Mechanical Alloying
The development of high-entropy (HE) alloys expanded the path of advanced materials research. These alloys with at least 5 principal elements in equiatomic or near equiatomic ratios have the tendency to form solid solutions (SS) phases, usually with FCC and/or BCC structures, instead of intermetallic compounds [1]. This effect is reflected with superior mechanical properties compared with conve...
متن کامل