Ferroelasticity due to hydrogen in metals
Ferroelasticity due to hydrogen in metals
The phase transitions of most alloys are barely understood today. In general phase diagrams are established purely empirically. Rarely a detailed understanding for the physical reason for the transitions exists. In this paper, it will be shown, that the new concept of ferroelasticity$^{(1) (2) (3)}$...
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Personal Name(s): | Alefeld, G. (Corresponding author) |
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Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Kernforschungsanlage Jülich, Verlag
1970
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Physical Description: |
29 p. |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte der Kernforschungsanlage Jülich
699 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
The phase transitions of most alloys are barely understood today. In general phase diagrams are established purely empirically. Rarely a detailed understanding for the physical reason for the transitions exists. In this paper, it will be shown, that the new concept of ferroelasticity$^{(1) (2) (3)}$ provides access to the understanding of a class of relatively complicated looking phase diagrams, namely for metal-hydrogen systems. First analogies between electric and elastic phenomena will be demonstrated. Then the temperature dependence of the elastic susceptibilities is calculated. The results are compared with experiments. Furthermore, it is shown that the relaxed elastic constants violate elastic stability criteria at characteristic temperatures. In the next section the average elastic interaction energy is calculated in mean field approximation. As an example the phase diagram for dipoleswhich are pure dilatation centers is calculated. Finally the phase diagrams for general dipols are given schematically and compared with experimental phasediagrams. |