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Thermodynamic Modeling of Materials: Microstructure and Properties

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Simulation and Design".

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 2568

Special Issue Editor


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Guest Editor
Christian Doppler Laboratory for Interfaces and Precipitation Engineering, Institute of Materials Science and Technology, TU Wien, Vienna, Austria
Interests: metastable phases; special alloy systems; intermetallics; precipitate evolution; functional materials; heterogeneous systems
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Special Issue Information

Dear Colleagues,

The vision of complex alloy design via integrated modeling and simulation has become a mission due to enormous physical modeling initiatives and rapidly increasing computing power. In the framework of computational materials engineering—whose main target is the predictive power in the coupling of modeling on different scales, from nanoscale (e.g., crystal structures, atomic ordering, clustering) up to macroscale (e.g., creep, crack formation)—the emergence of models for microstructural evolution trends in a mean‐field and full‐field modeling of materials involving local chemical and microstructural changes and interfaces has become feasible. Modeling activities, as represented by high-quality contributions to this Special Issue, will constitute puzzle pieces toward the realization of the dream of a fully integrated, predictive computational materials design.

Predictive simulation of materials behavior requires a physically appropriate integrated modeling base,  consisting of thermodynamics, the kinetics of alloy phase transformations, models for the evolution of the microstructure, crystal plasticity modeling such as dislocation dynamics, and models for the evaluation of mechanical properties.

This Special Issue aims to collect predictive modeling approaches, allowing for an in‐depth understanding of microstructural trends and their consequences for macroscopic materials properties and their multicomponent and multimaterials extensions toward predictions for real technological materials.

A major research task refers to the assessment of the role of local chemical and microstructural heterogeneities as well as defects and interfaces and their dynamics for materials properties and materials behavior during thermomechanical treatment.

Moreover, this issue will be open to pressing issues which are important in the scope of sustainability of multicomponent/multimaterial technological systems, namely, the microstructural and/or functional degradation (resistance) under varying thermomechanical treatments, thermal cycling, holding and operating times, and load. Answers to these questions require a deeper understanding of the coupling between materials composition variations, heat treatment, phase stabilities and phase evolution, and strengthening and mechanical materials response.

Dr. Erwin Povoden-Karadeniz
Guest Editor

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Keywords

  • computational materials engineering
  • phase transformation
  • stability
  • thermokinetics
  • strengthening
  • mechanical properties

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Published Papers (1 paper)

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Research

10 pages, 984 KiB  
Article
Thermodynamic Formation Properties of Point Defects in Germanium Crystal
by Jinping Luo, Chenyang Zhou, Qihang Li and Lijun Liu
Materials 2022, 15(11), 4026; https://doi.org/10.3390/ma15114026 - 6 Jun 2022
Cited by 1 | Viewed by 1907
Abstract
Point defects are crucial in determining the quality of germanium crystals. A quantitative understanding of the thermodynamic formation properties of the point defects is necessary for the subsequent control of the defect formation during crystal growth. Here, molecular dynamics simulations were employed to [...] Read more.
Point defects are crucial in determining the quality of germanium crystals. A quantitative understanding of the thermodynamic formation properties of the point defects is necessary for the subsequent control of the defect formation during crystal growth. Here, molecular dynamics simulations were employed to investigate the formation energies, total formation free energies and formation entropies of the point defects in a germanium crystal. As far as we know, this is the first time that the total formation free energies of point defects in a germanium crystal have been reported in the literature. We found that the formation energies increased slightly with temperature. The formation free energies decreased significantly with an increase in temperature due to the increase in entropy. The estimated total formation free energies at the melting temperature are ~1.3 eV for self-interstitial and ~0.75 eV for vacancy, corresponding to a formation entropy of ~15 kB for both types of point defects. Full article
(This article belongs to the Special Issue Thermodynamic Modeling of Materials: Microstructure and Properties)
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