Lehrinhalte
Metastable materials are classified as systems that are not in their lowest free energy state in terms of the composition and/or structure. Based on this classification, most of the structural and functional materials can be considered metastable, as their free energy can be lowered by phase transformations or via reduction of defects. In this course, the underlying thermodynamics and kinetics of phase formation and the extent of (meta-)stability in different important classes of metastable materials will be covered. The course will be divided based on the nature of metastability in materials, such as compositional, structural and morphological, with a special focus placed on the following systems:
[list]
[*]Compositional: Supersaturated solid-solutions, diffusionless phase transformations and precipitation
[*]Structural: Metallic glasses
[*]Morphological: Nanomaterials
[/list]
In addition, the non-equilibrium processing techniques that are important for the synthesis of the aforementioned materials classes along with their unique properties that are relevant for practical applications will be discussed.
Literature
[list=1]
[*]D.A. Porter, K.E. Easterling, M.Y. Sherif, Phase Transformations in Metals and Alloys, Third Edition, 2009.
[*]D.R. Gaskell, D.E. Laughlin, Introduction to the Thermodynamics of Materials, Sixth Edition, CRC Press, 2017.
[*]D. Turnbull, Metall. Trans. B 12 (1981) 217230.
[*]A.L. Greer, Science, 267 (1995) 19471953.
[*]H. Gleiter, Prog. Mater. Sci. 33 (1989) 223315.
[/list]
Metastable materials are classified as systems that are not in their lowest free energy state in terms of the composition and/or structure. Based on this classification, most of the structural and functional materials can be considered metastable, as their free energy can be lowered by phase transformations or via reduction of defects. In this course, the underlying thermodynamics and kinetics of phase formation and the extent of (meta-)stability in different important classes of metastable materials will be covered. The course will be divided based on the nature of metastability in materials, such as compositional, structural and morphological, with a special focus placed on the following systems:
[list]
[*]Compositional: Supersaturated solid-solutions, diffusionless phase transformations and precipitation
[*]Structural: Metallic glasses
[*]Morphological: Nanomaterials
[/list]
In addition, the non-equilibrium processing techniques that are important for the synthesis of the aforementioned materials classes along with their unique properties that are relevant for practical applications will be discussed.
Literature
[list=1]
[*]D.A. Porter, K.E. Easterling, M.Y. Sherif, Phase Transformations in Metals and Alloys, Third Edition, 2009.
[*]D.R. Gaskell, D.E. Laughlin, Introduction to the Thermodynamics of Materials, Sixth Edition, CRC Press, 2017.
[*]D. Turnbull, Metall. Trans. B 12 (1981) 217230.
[*]A.L. Greer, Science, 267 (1995) 19471953.
[*]H. Gleiter, Prog. Mater. Sci. 33 (1989) 223315.
[/list]
- Lehrende: Anonym
Semester: WT 2022/23