Accession Number:

ADA151725

Title:

Microscopic Study of the Influence of Impurities on Interface Bonding.

Descriptive Note:

Annual technical rept. 1 Dec 83-30 Nov 84,

Corporate Author:

TEXAS UNIV AT AUSTIN CENTER FOR MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

• Marcus, H. L.

Report Date:

1985-01-25

Pagination or Media Count:

68.0

Abstract:

Research on the relation between impurities and second phases at interfaces and their impact on the mechanical properties is reported. Model layered systems involving interfaces in Algraphite MMC and the Ni-Ni system were investigated. In addition model steel systems, both ferritic and austenitic were studied to evaluate segregation to the interface and the impact on fracture and stress corrosion cracking of the segregated species. In the layered structures the relation between the conductivity normal to the interface and the fracture path was evaluated under different interface processing conditions with a variety of experimental results. The method of preparation of the interface played a major role in the switching and fracture characteristics. In the steels a correlation between the segregation at the interface and the fraction of interface failure with the fracture toughness was evaluated. Originator supplied keywords include Auger electron spectroscopy, Interface characteristics, Interface fracture, Scanning auger microscopy, IV switching, Metal matrix composites, Aluminumgraphite composites, Mn stainless steels, Intergranular fracture.

Descriptors:

• *STAINLESS STEEL
• *METAL MATRIX COMPOSITES
• *IMPURITIES
• *FRACTURE(MECHANICS)
• *MICROSCOPY
• *METAL METAL BONDS
• INTERFACES
• CRACKING(FRACTURING)
• GRAPHITE
• TOUGHNESS
• SEGREGATION(METALLURGY)
• ALUMINUM
• BONDING
• STRESS CORROSION
• SWITCHING
• AUGER ELECTRON SPECTROSCOPY

Subject Categories:

• Laminates and Composite Materials
• Properties of Metals and Alloys
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE