Effect of Initial Temper on the Mechanical Properties of Friction Stir Welded Al-2024 Alloy (Preprint)

Abstract

The microstructural evolution and resultant mechanical properties during friction stir welding (FSW) of precipitation strengthened aluminum alloys depend on initial temper as well as FSW process parameters. Al-2024 alloy under two different initial tempers, T3 and T8, was used in this study. FSW bead-on-plate runs were performed at different values of process parameters (tool rotation rate and tool traverse speed). Microstructure and mechanical properties of the nugget region and heat affected zone (HAZ) were evaluated. Differential scanning calorimetry (DSC) revealed that in the nugget region, presence of GPB zone results from the partial dissolution of Al2CuMg phase. The microstructure and tensile properties were found to be independent of the initial temper of the material in the nugget region. In the HAZ region, tensile properties increased at higher heat-index values for T3 condition, and decreased monotonically for T8 condition.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2006
Accession Number
ADA462005

Entities

People

  • R. J. Lederich
  • R. S. Mishra
  • R. Talwar
  • V. Dixit

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Electron Microscopes
  • Electron Microscopy
  • Friction
  • Friction Stir Welding
  • Manufacturing
  • Materials
  • Materials Science
  • Mechanical Properties
  • Precipitation
  • Tensile Properties
  • Tensile Strength
  • Welding

Fields of Study

  • Materials science

Readers

  • Mathematics or Statistics
  • Metallurgy
  • Powder metallurgy of Titanium alloys.