Bonding, Energetics and Mechanical Properties of Intermetallics
Abstract
In high-temperature intermetallics, dislocations play an especially important role for understanding mechanisms of their deformation and fracture behavior and anomalous mechanical response which are still far from being well understood and remain a challenge to theoretical explanation. Progress in this complex area requires understanding such key phenomena as dislocation structure and mobility, and crack blunting and propagation: while they have been characterized by mesoscopic length and energy scales, they are determined on the microscopic level by the electronic structure which has, in many cases to be carefully taken into account using abinitio techniques. The most important and challenging component of our research objectives is to bridge the gap between a microscopic quantum-mechanical description of the chemical bonding and the mesoscopic phenomena which govern the mechanical response. It is highly desirable that theory describes dislocation core structure in a compact and physically transparent form which would provide a natural link with larger length theories of dislocation motion processes (kink formation, propagation and cross-slip) as well as to study how dislocations, as typical extended defects, influence functional properties.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2000
- Accession Number
- ADA391734
Entities
People
- Arthur J. Freeman
Organizations
- Northwestern University