Hostname: page-component-6bf8c574d5-mggfc Total loading time: 0 Render date: 2025-02-22T23:19:48.708Z Has data issue: false hasContentIssue false
  • English
  • Français

Order-Disorder Transformations in the σ3 (111)/[110] Symmetrical Tilt Boundary in Tungsten

Published online by Cambridge University Press:  21 February 2011

Gui Jin Wang  and
V. Vitck
Gui Jin Wang
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104–6272, U. S. A.
V. Vitck
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104–6272, U. S. A.
Get access

Abstract

The structure of the σ3 (111)/[110] symmetrical tilt boundary in tungsten was modeled by molecular statics using Finnis-Sinclair type many body potentials. Several multiple structures have been found which are composed of two types of structural units and the interaction energy between these units is negative. Hence, order-disorder structural transitions may occur in the boundary with structures being ordered and/or disordered mixtures of the two units. The uansilion temperature is found to be 1158K if only the internal energy and configurational entropy arc included when evaluating the free energy. However, the transition temperature is 782K if the vibrational entropy is also incorporated. This demonstrates that the vibrational contribution to the entropy may be as important as the configurational contribution when considering the inierfacial transformations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 563
Copyright
Copyright © Materials Research Society 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1 Wang, G. J., Sutton, A. P. and Vitek, V., Acta Metall. 32, 1093 (1984).Google Scholar
2 Vitek, V., Minonishi, Y. and Wang, G. J., J. Phys. France 46, C4 (1985).Google Scholar
3 Oh, Y. and Vitek, V., Acta Metall. 34, 1941 (1986).Google Scholar
4 Majid, I. and Bristowe, P. D., Scripta Metall. 21, 1153 (1987).Google Scholar
5 Mazilova, T. I. and Mikhailovskii, I. M., Fiz Tverd Tela 37, 206 (1995).Google Scholar
6 Bourret, A. and Bacmann, J. J., JIMIS-4, edited by Ishida, Y. (Minakami, Japan, The Japan Institute of Metals), p. 125 (1986).Google Scholar
7 Bourret, A., J. Phys. France 51, 1 (1990).Google Scholar
8 Krakow, W., Acta Metall. Mater. 38, 1031 (1990).Google Scholar
9 Krakow, W., Philos. Mag. A 63, 2 (1991).Google Scholar
10 Wang, G. J., Vitek, V., Alber, I., Bassani, J. L. and Tichy, G., in Intergranular and Interphase Boundaries in Materials: iib92, edited by Komninou, P. and Rocher, A. (Aedermannsdorf, Trans Tech Publications), p. 337 (1992).Google Scholar
11 Rottman, C., Scripta Metall. 23, 1037 (1989).Google Scholar
12 Finnis, M. W. and Sinclair, J. E., Philos. Mag. A 50, 45 (1984).Google Scholar
13 Ackland, G. J. and Thetford, R., Philos. Mag. A 56, 15 (1987).Google Scholar
14 Ashcroft, N. W. and Mermin, N. D., Solid State Physics, (Saunders College, Philadelphia, 1976).Google Scholar
15 DeWette, F. W., Surface Phonons, edited by Kress, W. and DeWette, F. W. (New York, Springer), Vol. 21, p. 67 (1991).Google Scholar
16 Alber, E. S., Bassani, J. L., Vitek, V. and Wang, G. J., Modelling and Simulation in Mat. Sci. Eng. 2,455 (1994).Google Scholar
17 Vitek, V., Wang, G. J., Alber, E. S. and Bassani, J. L., J. Phys. Chem. Sol. 55, 1147 (1994).Google Scholar