Interfacial Control of Creep Deformation in Ultrafine Lamellar TiA1

Abstract

Solute effect on the creep resistance of two-phase lamellar TiAl with an ultrafine microstructure creep- deformed in a low-stress (LS) creep regime WHERE A NEARLY LINEAR CREEP BEHAVIOR WAS OBSERVED has been investigated. The resulted deformation substructure and in-situ TEM experiment reveals that interface sliding by the motion of preexisting interfacial dislocations is the predominant deformation mechanism in LS creep regime. Solute segregation at interfaces and interfacial precipitation caused by the segregation result in an increase of creep resistance in LS creep regime.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2003
Accession Number
ADP014280

Entities

People

  • L. M. Hsiung

Organizations

  • Lawrence Livermore National Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Chemical Compounds
  • Chemical Engineering
  • Chemistry
  • Composite Materials
  • High Temperature
  • Materials
  • Materials Engineering
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Metallurgy
  • Particle Size
  • Particles
  • Powder Metallurgy
  • Resistance
  • Structural Components
  • Ultrafines

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.