Characterization of the high temperature dislocation substructure of MoSi{sub 2}
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
The dislocation substructure of polycrystalline MoSi{sub 2} deformed in compression at temperatures ranging from 900 C to 1,300 C has been investigated. Slip is found to occur primarily by {l_angle}100{r_angle} Burgers vectors. A quantitative characterization of the {l_angle}100{r_angle} dislocation substructure is developed for several deformation temperatures, including the slip systems present and the relative occurrence of each. Orientation distributions showing the screw/edge present and the relative occurrence character of the {r_angle}100{l_angle} dislocations are generated at each deformation temperature. Variations in these distributions with temperature are noted, and the implications of these variations to the deformation behavior of MoSi{sub 2} are discussed.Notable observations include the onset of dislocation climb between 900 C and 1,100 C, a strong preference for dislocations of mixed character at 900 C, and the complete absence of pure screw dislocations from 900 C to 1,300 C.
- OSTI ID:
- 72492
- Report Number(s):
- CONF-941144--; ISBN 1-55899-265-0
- Country of Publication:
- United States
- Language:
- English
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