Metal Processing Operations. Volume I: Grain Boundary and Sub-Boundary Strengthening in Aluminum at Room Temperature.
Interim rept. 1 Sep 73-31 Mar 74,
WESTINGHOUSE ASTRONUCLEAR LAB PITTSBURGH PA
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Data on the room temperature strength of polycrystalline aluminum appearing in the literature, have been analysed to separate and to compare the strength contributions from grain boundaries and from sub-boundaries it had been shown that, for the same boundary density, cold work and anneal sub-boundaries make a greater contribution to strength than grain boundaries. The analysis has also shown that hot work sub-boundaries make a smaller contribution than grain boundaries for subgrain and grain sizes larger than approximately 0.000003 m below this size, however, hot work sub-boundaries make the greater contribution to strength, and this becomes comparable with the strength contribution expected from cold work and anneal sub-boundaries at about 0.000001 m. The sub-boundary strength data for hot work sub-boundaries are consistent with a model in which the density of dislocation sources in the sub-boundaries varies markedly with subgrain size.
- Metallurgy and Metallography