An electron backscatter diffraction analysis of the microstructure of pure aluminum processed by equal-channel angular pressing
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Authors
Terhune, Shannon Derek
Subjects
Equal-channel angular pressing
Electron backscatter diffraction
Grain refinement
Submicrometer grain refinement
Massive deformation
Plastic deformation
Deformation banding
Boundary misorientation
Preferred misorientation angle
Electron backscatter diffraction
Grain refinement
Submicrometer grain refinement
Massive deformation
Plastic deformation
Deformation banding
Boundary misorientation
Preferred misorientation angle
Advisors
McNelley, Terry R.
Date of Issue
1998-12-01
Date
December 1998
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
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
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
viii, 53 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.