Examination of the Microstructure of 7050 Aluminum Alloy Samples

Abstract

As part of the evaluation of the structural life of the F/A-18 fighter aircraft, samples of the Aluminum Alloy 7050 taken from several different fatigue specimens, including F/A-18 FS 488 Bulkhead fatigue test articles, several laboratory fatigue tests specimens, and elsewhere, were examined metallurgically. The microstructure of the bulkhead material was also examined using thin foils in a Transmission Electron Microscope. These examinations revealed marked variations in the grain size, orientation and morphology, which were found to depend to some extent on the thickness of the original rolled plate material, and may have a marked effect on the initiation of fatigue in F/A-18 major structural components.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1990
Accession Number
ADA232544

Entities

People

  • L. Lambrianidis
  • N. Athiniotis
  • S. A. Barter

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Aluminum
  • Aluminum Alloys
  • Chemical Synthesis
  • Chemistry
  • Department Of Defense
  • Electron Microscopes
  • Electron Microscopy
  • Fatigue Tests (Mechanics)
  • Grain Boundaries
  • Grain Size
  • Heat Energy
  • Heat Treatment
  • Materials
  • Mechanical Properties
  • Structural Components

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Metallurgy
  • Military Training and Readiness Simulation

Technology Areas

  • Microelectronics