Accession Number:

ADA230541

Title:

Fundamental Concepts Relating Local Atomic Arrangement Deformation and Fracture of Intermetallic Alloys

Descriptive Note:

Annual technical rept. 1 Feb 1990-1 Jan 1991

Corporate Author:

VIRGINIA UNIV CHARLOTTESVILLE DEPT OF MATERIALS SCIENCE

Personal Author(s):

• Starke, Jr., Edgar A.
• Wert, John A.

Report Date:

1990-12-01

Pagination or Media Count:

10.0

Abstract:

The objective of this research program is to identify relationships between characteristics of intermetallic alloys at an atomic scale, the operation of slip and twinning deformation mechanisms at a microstructural scale, and bulk deformation and fracture properties. Our research focuses on two fundamental aspects of the problem of low toughness of intermetallic alloys The role of deformation twinning in promoting ductility and toughness of ordered intermetallic alloys, and modeling the effect of dislocation characteristics on crack tip plasticity.

Descriptors:

• *INTERMETALLIC COMPOUNDS
• DEFORMATION
• CRACKS
• TOUGHNESS
• FRACTURE(MECHANICS)
• SCALE
• PLASTIC PROPERTIES
• DUCTILITY
• TWINNING(CRYSTALLOGRAPHY)
• MICROSTRUCTURE
• DISLOCATIONS

Subject Categories:

• Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE