Ageing of Forged Aluminium-Lithium 8091 Alloy

Abstract

The microstructures obtained in forged 8091 alloy after using selected ageing heat treatments have been studied by transmission electron microscopy, and the corresponding tensile and fracture toughness properties measured. It was found that ageing by heating at a controlled rate of 10 C/h from room temperature to the ageing temperature (170 C or 190 C), and then holding at this temperature, led to a finger, more uniform distribution of the S' phase compared to normal direct ageing. This improved the strength/toughness balance of the alloy. Great Britain.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1988
Accession Number
ADA208776

Entities

People

  • P. D. Pitcher

Organizations

  • Royal Aircraft Establishment

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Boundaries
  • Chemistry
  • Cold Working
  • Electron Microscopy
  • Grain Boundaries
  • Heat Treatment
  • Lithium Alloys
  • Materials
  • Mechanical Properties
  • Physical Metallurgy
  • Precipitation
  • Solid Solutions
  • Stress Corrosion Cracking
  • Tensile Strength
  • Transmission Electron Microscopy

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics