Processing and Properties of Al-Li-Cu-X Alloys

Abstract

The objectives of this research were to identify the mechanisms for the large difference in ductility between the near peak aged AF/C-489 and AF/C-458 and then develop an aging schedule to optimize the microstructure for high strength and ductility. Duplex aging treatments produced significant increases in ductility for AF/C-489, approaching that of AF/C-458. Although strain localization occurred in both alloys it was more severe in AF/C-489 due to the higher volume fraction of shearable delta prime and a much larger grain size. Our results show that a significant increase in ductility of the higher lithium AF/C-489 can be obtained by double aging and reducing the grain size. The report describes the details of the study and the optimum processing to obtain this goal.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2000
Accession Number
ADA387422

Entities

People

  • Edgar A. Starke Jr.

Organizations

  • University of Virginia

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aluminum Alloys
  • Chemical Synthesis
  • Chemistry
  • Crystal Structure
  • Electron Microscopes
  • Electron Microscopy
  • Grain Size
  • Heat Treatment
  • Materials
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Microscopes
  • Solid Solutions
  • Tensile Properties
  • Tensile Strength

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.