Interactions of stress with chemical processes in crystalline materials
This topic is relevant for the Earth and currently controversial in Earth sciences. My view is based on works by Larche and Cahn. I have shown that the effects of stress on solid-state reactions may be large (which means large enough to alter geological interpretations in a number of ways). The type of effect I describe in Wheeler 2014 has not, to my knowledge, been discussed in relations to metals and ceramics, and it might be important. I will show that it is of limited use to define a Gibbs free energy in a stressed system. Instead one must discard the prospect of equilibrium and think in terms of local chemical potentials and ongoing processes. My ideas are strongly influenced by the underpinning theory that allows us to understand diffusion creep. The ideas are in fact an extension of diffusion creep theory to multiphase systems, so are completely compatible with the operation of that deformation mechanism. Whilst I may use minerals as example systems, I will make suggestions as to how the ideas are relevant for alloys and ceramics – in fact, for solid-state reactions in general.
My recent key papers:
Wheeler, J. 2014. Dramatic effects of stress on metamorphic reactions. Geology 42(8), 647-650.
Wheeler, J. 2018. The effects of stress on reactions in the Earth: sometimes rather mean, usually normal, always important. Journal Of Metamorphic Geology 36, 439-461.
Prof. Dr. John Wheeler
Professor of Geology Earth, Ocean and Ecological Sciences
Dept. Earth, Ocean and Ecological Sciences
School of Environmental Sciences
Liverpool University
Liverpool L69 3GP
U.K.
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+44 151 794 5172 |
| Prof. J. Wheeler | |
| Http | Professor of Geology Earth, Ocean and Ecological Sciences |