Microstructural Changes Caused by Thermal Treatment and Their Effects on Mechanical Properties of a gamma/gamma' - delta Eutectic Alloys.

Abstract

Microstructural changes due to thermal treatments of a directionally solidified gamma/gamma' - delta eutectic alloy were investigated. Aging treatments of 8 to 48 hours and ranging from 750 to 1120 deg C were given to the alloy in both its as directionally solidified condition and after gamma' solutioning. Aging resulted in gamma' coarsening, gamma precipitates in delta, and delta and gamma' precipitates in gamma. The tensile strength was increased about 12 percent at temperatures up to 900 deg C by a heat treatment. Times to rupture were essentially the same or greater than for as directionally solidified material. Tensile and rupture ductility in the growth direction of the alloy were reduced by the heat treatment.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1976
Accession Number
ADA328175

Entities

People

  • Robert L. Dreshfield
  • Surendra N. Tewari

Organizations

  • Glenn Research Center

Tags

DTIC Thesaurus Topics

  • Chemical Synthesis
  • Chemistry
  • Electron Diffraction
  • Electron Microscopes
  • Electron Microscopy
  • Heat Treatment
  • High Temperature
  • Low Temperature
  • Materials
  • Mechanical Properties
  • Microscopes
  • Microscopy
  • Solid Solutions
  • Temperature Gradients
  • Tensile Properties
  • Tensile Strength
  • Transmission Electron Microscopy

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Mathematics or Statistics
  • Reinforced Composite Materials