Accession Number:

ADA002630

Title:

Metal Processing Operations. Volume I: Grain Boundary and Sub-Boundary Strengthening in Aluminum at Room Temperature.

Descriptive Note:

Interim rept. 1 Sep 73-31 Mar 74,

Corporate Author:

WESTINGHOUSE ASTRONUCLEAR LAB PITTSBURGH PA

Personal Author(s):

Report Date:

1974-07-01

Pagination or Media Count:

72.0

Abstract:

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.

Subject Categories:

  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE