Plasticity of Single Crystalline Al3X Intermetallic Compounds

Abstract

Single crystals of six different compositions were grown, five of A13 Ti + Fe and one of A13 TI + Cr. The flow stress was measured as a function of temperature, orientation and composition. A12Ti precipitates are the major strengthening phase and form platelets on the 100 planes of the L12 matrix. Deformation occurs primarily by <110> 111 slip, with SISF dissociation at low temperatures and by APB dissociation at high temperatures. Simulations of dislocation cores using many body potentials have revealed a variety of core configurations in the L12 and D022 form, all of which are sessile and one of which provides a twinning mechanism.

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Document Details

Document Type
Technical Report
Publication Date
Jun 29, 1992
Accession Number
ADA254282

Entities

People

  • D. E. Luzzi
  • D. P. Pope
  • V. Vitek

Organizations

  • University of Pennsylvania

Tags

DTIC Thesaurus Topics

  • Air Force
  • Alloys
  • Classification
  • Crystal Structure
  • Crystals
  • Diffraction
  • Dislocations
  • Dissociation
  • High Temperature
  • Intermetallic Compounds
  • Low Temperature
  • Materials
  • Materials Science
  • Mechanical Properties
  • Orientation (Direction)
  • Simulations
  • Stresses

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.