An Electron Backscatter Diffraction Analysis of the Microstructure of Pure Aluminum Processed by Equal-Channel Angular Pressing

reportActive / Technical Report | Accession Number: ADA359663 | Open PDF

Abstract:

Equal-channel angular ECA pressing is a promising method to achieve refinement of grain size to 1.0 micrometer or less for aluminum and its alloys. Computer-aided electron backscatter diffraction EBSD analysis of high purity aluminum 99.99 which had been subjected to one pass, four passes, and twelve passes through an ECA die was performed. Grain and subgrain size and boundary misorientation distributions during such large-strain deformation processing were of particular interest. A texture was present after one pressing and the boundary misorientation distribution had a peak at 5 deg - 10 deg although boundaries were present in all misorientation ranges. Fine equaixed grains were achieved after twelve passes through the ECA die, accompanied by random orientation and misorientation distributions.

Author(s):
Terhune, Shannon D.
Author Organization(s):
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Descriptive Note:
Master's thesis
Pagination:
0055

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
NPS
 Subject Terms
Joint Capability Areas:
JCA_5.3_Planning; JCA_5_Command and Control; JCA_4.6_Engineering; JCA_4.6.1_General Engineering; JCA_5.3.3_Develop Strategy; JCA_5.3.4_Develop Courses of Action; JCA_5.3.5_Analyze Courses of Action; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_3.2_Engagement; JCA_3_Force Application; JCA_1.2.3_Educating; JCA_6_Net Centric; JCA_6.1.3_Switching and Routing; JCA_1.2.5_Lessons Learned; JCA_6.1_Information Transport; JCA_1.4.1_Force Health Protection; JCA_1.4_Force Support; JCA_3.2.1_Kinetic Means; JCA_8_Building Partnerships
Modernization Areas:
Microelectronics; Autonomy
Communities of Interest:
Air Platforms
Descriptor(s):
*MICROSTRUCTURE, *GRAIN SIZE, *BACKSCATTERING, *ALUMINUM, *ELECTRON DIFFRACTION, *PRESSING(FORMING), PLASTIC DEFORMATION, ALUMINUM ALLOYS, STRAIN HARDENING, THESES, PURITY, COMPUTER APPLICATIONS, DIFFRACTION ANALYSIS, CRYSTALLOGRAPHY, GRAIN BOUNDARIES
Field(s)/Group(s):
Properties of Metals and Alloys, Crystallography, Atomic and Molecular Physics and Spectroscopy
Keyword(s):
*EQUAL CHANNEL ANGULAR PRESSING, ECA(EQUAL CHANNEL ANGULAR), EBSD(ELECTRON BACKSCATTER DIFFRACTION), BOUNDARY MISORIENTATION DISTRIBUTION, LARGE STRAIN DEFORMATION, *GRAIN REFINEMENT
Report Date:
1998 Dec 01
Creation Date:
1999 Feb 17