Kinetic processes at grain boundaries
Abstract
The objective of the present research was a broad investigation of kinetic processes at grain boundaries and the relationship between those kinetic processes and the boundary structure. The approach was both experimental and theoretical. Extensive use was made of high resolution experimental methods of investigating grain boundaries in specimens containing boundaries of controlled geometry. Computer simulation was also employed. Elements of the following projects were completed: (1) a study of intrinsic and extrinsic secondary grain boundary dislocation structure in high angle twist boundaries in MgO; (2) a study of grain boundary dislocation in plane matching grain boundaries; (3) an analysis and review of high angle grain boundaries as sources or sinks for point defects; (4) an analysis and review of grain boundary structure in metals and ceramic oxides; (5) simulation of the structure vacancies in high angle grain boundaries. Progress was made in the following areas; (6) development of a model for diffusion induced grain boundary migration; and (7) determination of the mechanism for grain boundary diffusion in metals.
- Publication:
-
Massachusetts Inst. of Tech. Report
- Pub Date:
- May 1980
- Bibcode:
- 1980mit..reptQ....B
- Keywords:
-
- Computerized Simulation;
- Dislocations (Materials);
- Grain Boundaries;
- Kinetics;
- Metal Crystals;
- Point Defects;
- Solid-State Physics