Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

A Unified Approach to Motion of Grain Boundaries, Relative Tangetial Translation along Grain Boundaries, and Grain Rotation

Published

Author(s)

John W. Cahn, J E. Taylor

Abstract

Four phenomena associated with grain boundary mechanics and motion are unified into a single theoretical formulation: normal motion of a grain boundary resulting from a shear stress applied tangetial to it [LEWP][Shv]; rigid sliding of one grain with respect to the other along a greased boundary; grain rotation to decrease misorientation driven by the reduction in the surface free energy per unit area, as in the model of [JAW]; and grain rotation which increases misorientation as seen in the molecular dynamics simulations of [SC].We postulate that almost any motion of an interface between two crystals, e.g., growth one grain into the other, can produce a tangetial motion of the two crystals relative to each other which, apart from possible additional stress-induced rigid sliding along the grain boundary, is proportional to the normal motion of the interface. Such translation for embedded cylindrical crystals produces a rotation. A phenomenological formulation in special cases and a closely related variational model incorporating all cases are proposed to determine the growth and translation or rotation. A more thorough exploration of this concept, including application to non-circular crystals, is being published elsewhere [TC2].
Citation
Acta Materialia

Keywords

grain boundary motion, grain rotation, shear, sliding

Citation

Cahn, J. and Taylor, J. (2008), A Unified Approach to Motion of Grain Boundaries, Relative Tangetial Translation along Grain Boundaries, and Grain Rotation, Acta Materialia (Accessed June 24, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created October 16, 2008