Accession Number:

ADA257859

Title:

Thermomechanical Processing of Aluminum Alloy 2519 for Grain Refinement and Superplasticity

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1992-06-18

Pagination or Media Count:

88.0

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 1s to 6.7xl0 to the -3 power 1s. 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.

Subject Categories:

  • Properties of Metals and Alloys
  • Plastics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE