Grain boundary sliding
Grain Boundary Sliding is a deformation mechanism of materials which includes displacement of grains against each other at high homologous temperature and low strain rate. This mechanism is the main reason of ceramics failure at high temperatures due to formation of glassy phase in their grain boundary.[1]
Mechanisms
Homogeneous deformation in a polycrystalline solid cannot be achieved by grain boundary sliding alone. The grain movements must be accommodated with either diffusion[2] or with dislocation motion.[3] In the Earth's upper mantle, dislocation-accommodated grain boundary sliding is expected to be the dominant deformation mechanism for olivine.[4]
References
- ^ Joachim Rösler, Harald Harders, Martin Bäker, Mechanical Behaviour of Engineering Materials, Springer-Verlag Berlin Heidelberg, 2007, p 396. ISBN 978-3-540-73446-8
- ^ Raj, R., and M. F. Ashby. "On grain boundary sliding and diffusional creep." Metallurgical transactions 2.4 (1971): 1113-1127.
- ^ A. D. Sheikh-Ali, "Grain Boundary Sliding: Theory" in Encyclopedia of Materials: Science and Technology, K. H. Jürgen Buschow, Robert W. Cahn, Merton C. Flemings, Bernard Ilschner, Edward J. Kramer, Subhash Mahajan, and Patrick Veyssière (Eds.), Elsevier Science Ltd. 2001, pp. 3624-3626. ISBN 978-0-08-043152-9
- ^ Hansen, L. N., M. E. Zimmerman, and David L. Kohlstedt. "Grain boundary sliding in San Carlos olivine: Flow law parameters and crystallographic‐preferred orientation." Journal of Geophysical Research: Solid Earth 116.B8 (2011).