Microstructural Effect on Fatigue of 7075 Aluminum Alloy

Abstract

This study was conducted to characterize the fatigue behavior of underaged and overaged 7075 aluminum alloy in vacuum of 4xl0(exp -8) torr. An emphasis was placed on clarifying the effects of different microstructures, arising from the underaging and overaging treatments, on the threshold fatigue crack growth (FCG). The FCG was measured under constant amplitude loading of stress ratios, ranging from 0.1 to 0.85, in vacuum of 4xl0(exp -8) torr. The result was analyzed in terms of threshold stress intensity range for FCG and maximum stress intensity. It was found that the underaging resulted in lower electrical conductivity, higher hardness, and greater resistance to threshold FCG than the overaging. This is attributable to the difference in microstructure.

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Document Details

Document Type
Technical Report
Publication Date
Jan 08, 2002
Accession Number
ADA398914

Entities

People

  • Eun U. Lee
  • Henry C. Sanders

Organizations

  • Naval Air Warfare Center

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aerial Warfare
  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Conductivity
  • Electrical Conductivity
  • Electron Microscopes
  • Elements
  • Hardness
  • Intensity
  • Materials
  • Mechanical Properties
  • Microscopes
  • Microstructure
  • Military Research
  • Resistance
  • Solid Solutions

Fields of Study

  • Materials science

Readers

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