Thermal Mechanical Processing of Al-Li Alloy 2020 To Achieve Fine Grain Size

Abstract

Aluminum lithium alloys are attractive as airframe materials because of their low density and high modulus of elasticity. However, these alloys suffer from poor fracture toughness and low ductility which limit their applicability. It is believed that the large constitutive particles and grain size exhibited by alloys such as 2020 aluminum are responsible for their low ductility and fracture toughness. Intermediate thermal mechanical processing (ITMT) involving heat treatment, cold work, and recrystallization was employed to refine the grain size of 2020 aluminum lithium plate. The grain size was successfully reduced from 400 microns to 10 microns. Future work will concentrate on the superplastic formability and fracture toughness of ITMT 2020 plate and new aluminum lithium alloys. Keywords: Aluminum alloys, Lithium, Grain size, Thermal mechanical processing.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1987
Accession Number
ADA199249

Entities

People

  • Julia Waldman
  • W. E. Frazier

Organizations

  • Naval Air Warfare Center Warminster

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Alloys
  • Aluminum Alloys
  • Chemistry
  • Elastic Properties
  • Grain Growth
  • Grain Size
  • Heat Treatment
  • Lithium Alloys
  • Low Density
  • Materials
  • Mechanical Properties
  • Mechanics
  • Modulus Of Elasticity
  • Particles
  • Security

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Metallurgy