Study of Precipitation and Recrystallization in A1 Alloy 2519 by Backscattered Electron Imaging Methods

Abstract

This study examines the effects of pre-strain deformation temperature, overaging temperature, and other variations in thermomechanical processing (TMP) on the mean size and size distribution of q-phase precipitate particles in Al alloy 2519. Examination was performed using the scanning electron microscope in the backscattered imaging mode and quantitative image analysis methods were employed. The goal was to find a combination of TMP parameters which produces q-phase particles exceeding a critical diameter for particle stimulated nucleation (PSN) of recrystallization. A necessary prerequisite for superplasticity is a uniformly fine, equiaxed grain size and PSN is theorized to be capable of such grain refinement. Such a microstructure has been developed in Aluminum alloys containing large second phase particles when the alloys are subjected to cold work and recrystallization treatments.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1993
Accession Number
ADA274919

Entities

People

  • Peter J. Zohorsky

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Chemistry
  • Diameters
  • Electron Microscopes
  • Electron Microscopy
  • Grain Size
  • Materials
  • Materials Science
  • Metallurgy
  • Metals
  • Microscopes
  • Microscopy
  • Phase Transformations
  • Physical Metallurgy
  • Scanning Electron Microscopes

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Theoretical Analysis.

Technology Areas

  • Microelectronics