Development of an Al-Mg-Li Alloy.

Abstract

Four Al-Mg-Li alloys were investigated for potential use in high performance aircraft. Ingot casting was very difficult. Fabricating was also difficult; however, a limited amount of sheet and some upset forgings were fabricated. Solution heat treatment practices providing highest strength were determined and aging surveys for each alloy were conducted. Cold working between solution heat treatment and artificial aging significantly affected response to artificial aging. Elastic moduli were higher and densities were lower than those of other aluminum alloys. Elevated temperature strengths were comparable to those of 2020-T6. Resistance to exfoliation corrosion was comparable to 7075-T76 sheet, but the alloys were highly susceptible to stress-corrosion cracking. Toughness of these alloys was also very low. (Modified author abstract)

Document Details

Document Type
Technical Report
Publication Date
Jun 24, 1974
Accession Number
AD0787027

Entities

People

  • Joseph W. Evancho

Organizations

  • Alcoa

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Cold Working
  • Corrosion
  • Heat Treatment
  • Mechanical Properties
  • Mechanical Working
  • Resistance
  • Solution Heat Treatment
  • Stress Corrosion
  • Stress Corrosion Cracking

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Metallurgy