Thermally Activated Unpinning of Screw Dislocations in the Anomalous Regime in Ll2 Compounds,

Abstract

We present a model for the anomalous increase of the yield stress exhibited by many Ll2 compounds. It is based on two thermally activated processes that describe respectively the pinning and unpinning of (101) screw dislocations in the (111) plane. The model explains all the important characteristic features observed in the anomalous regime. We discuss the applications of the model to Ni3Ga and Ni3(Al,Ta).

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1993
Accession Number
ADA278286

Entities

People

  • J. Cserti
  • M. Khantha
  • V. Vitek

Organizations

  • University of Pennsylvania

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Compression
  • Discontinuities
  • Dislocations
  • Displacement
  • Energy
  • Enthalpy
  • Equations
  • Free Flight
  • High Temperature
  • Low Temperature
  • Materials
  • Materials Science
  • Orientation (Direction)
  • Steady State
  • Strain Rate

Fields of Study

  • Physics

Readers

  • Applied Combinatorial Optimization and Logic Circuit Design.
  • Computational Modeling and Simulation
  • Materials Science and Engineering.