Tensile Study of Single-Crystal Ternary L12 Trialuminide Al66Ti25Mng

Abstract

Single crystal Al66Ti25Mn9 has been produced and tested in compression as well as uniaxial tension. Yield strengths in compression for orientations near 001 and (111) continuously decrease with increasing temperature in a manner similar to other single crystal Ll 2 trialuminides, and also to polycrystals of these materials. Slip was determined to occur on the (111) octahedral planes using two-surface analysis. Critical resolved shear stress (CRSS) variation with temperature, calculated for the (111) (101) slip system, overlaps closely for both orientations. Dislocation analysis confirmed the Burgers vectors to be of the type a<110> at both 298K and 1073K. A few uniaxial tension tests were conducted near (001) at 1073K; the HIPed specimens contained a small amount of residual porosity and second phases, which resulted in elastic failure even at this high temperature. Efforts to produce additional crystals with even better microstructures for tension testing are underway.

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Document Details

Document Type
Technical Report
Publication Date
Mar 02, 1993
Accession Number
ADA264297

Entities

People

  • K. S. Kumar
  • Steven A. Brown

Organizations

  • Martin Marietta

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Analysis
  • Crystal Structure
  • Crystals
  • Electron Microscopes
  • Electron Microscopy
  • High Temperature
  • Isotherms
  • Materials
  • Mechanical Properties
  • Microscopes
  • Microscopy
  • Orientation (Direction)
  • Polycrystals
  • Shear Stresses
  • Single Crystals
  • Stresses
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.