Accession Number:

ADA261293

Title:

Fundamental Aspects of Metal Joining - The Study of Strong Interfaces

Descriptive Note:

Final rept.

Corporate Author:

SRI INTERNATIONAL MENLO PARK CA

Report Date:

1992-12-01

Pagination or Media Count:

31.0

Abstract:

Our aim for 1992 was to investigate whether modern quantum mechanical methods can be useful in the study of interfaces between dissimilar materials, and to complete at least a modest piece of work to demonstrate feasibility. This has been achieved. We developed an approximate quantum mechanical approach to the problem of dissimilar transition-metal interfaces. Because of its approximate nature, we have devoted a large effort to testing the scheme against experiment and first-principles theory. Our expertise in local density functional theory has allowed us to draw upon our first-principles capability both in determining parameters for our model Hamiltonian, and in testing it. We have studied in some detail a lattice-mismatched interface between pure molybdenum and rhenium metals Section 2. Our conclusions concerning this system are that the shear strength of the interface is diminished from the theoretical strength by a factor of about twenty the reduction is due to the presence of a misfit dislocation that glides in the interface during deformation.

Subject Categories:

  • Physical Chemistry
  • Crystallography
  • Atomic and Molecular Physics and Spectroscopy
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE