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Published January 1, 1989 | public
Journal Article Open

Structural and thermodynamic properties of heavily mechanically deformed Ru and AlRu


We report on high-energy ball milling of Ru and AlRu. The deformation results in a drastic decrease of the crystal size to a nanometer scale and in an increase of atomic-level strain. This is accompanied by a disordering of the crystal lattice as is shown by means of the long-range-order parameter in AlRu. The specific heat increases by more than 15%–20%, indicating large changes in the vibrational and configurational part of the entropy. The stored energy of cold work is up to 6 kJ/mol for AlRu and 10 kJ/mol for Ru. This is almost 40% of the heat of fusion of Ru and exceeds by far the energies stored by other deformation processes.

Additional Information

Copyright © 1989 American Institute of Physics (Received 22 July 1988; accepted 13 September 1988) This work was supported by the U.S. Department of Energy (DOE Contract No. DE-FG03-86ER45242). One of the authors (E.H.) gratefully acknowledges partial support by an Ernst von Siemens grant. Special thanks are given to R. Birringer and C. Garland for the TEM work, L. Anthony for his help in data analysis, and C. Geremia for technical assistance.


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