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

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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1998
Accession Number
ADA359663

Entities

People

  • Shannon D. Terhune

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Cellular Structures
  • Computers
  • Crystal Lattices
  • Crystal Structure
  • Diffraction
  • Diffraction Analysis
  • Electron Microscopes
  • Electron Microscopy
  • Geometry
  • Grain Size
  • Materials
  • Materials Science
  • Measurement
  • Metals
  • Microscopes
  • Microscopy
  • Orientation (Direction)

Fields of Study

  • Materials science

Readers

  • Aerosol Science/Aerosol Physics
  • Database Systems and Applications
  • Materials Science and Engineering.

Technology Areas

  • Microelectronics