Thermomechanical Processing of Aluminum Alloy 2519 for Grain Refinement and Superplasticity

Abstract

Thermomechanical processing (TMP) methods developed for Al-Mg and Al- Mg-Li alloys have been modified and applied to the commercial 2519 Al-Cu alloy. The TMP included initial overaging and was designed to facilitate particle- stimulated nucleation (PSN) of recrystallization during controlled reheating intervals between successive rolling passes of the process. Effects of TMP variables were evaluated by tensile testing at temperatures ranging from 300-450 deg C. Strain rates varied from 6.7xl0 to the -5 power 1/s to 6.7xl0 to the -3 power 1/s. Also, microstructural analysis was conducted to determine the effect of the processing on the microstructure. The further evolution of microstructure during superplastic testing of the material was also assessed. Refinement to grain sizes below 10 microns by PSN was achieved. Superplastic ductility of 260 pct. elongation was limited by grain growth.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 18, 1992
Accession Number
ADA257859

Entities

People

  • Scott D. Bohman

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Alloys
  • Aluminum Alloys
  • Crystal Lattices
  • Electron Microscopes
  • Electron Microscopy
  • Engineering
  • Grain Growth
  • Grain Size
  • Hardening
  • Materials
  • Mechanical Engineering
  • Mechanical Properties
  • Mechanics
  • Microscopy
  • Solid Solutions
  • Strain Rate
  • Tensile Testing

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.