Accession Number:

ADA295565

Title:

The Effects of Interstitial Elements on the Phase Stability and Mechanical Behavior of Intermetallics.

Descriptive Note:

Final rept. 1 Jan 89-31 Dec 93,

Corporate Author:

NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

• Koch, Carl C.

Report Date:

1994-01-25

Pagination or Media Count:

7.0

Abstract:

This document constitutes the final report for ONR sponsored research entitled. The Effects of Interstitial Elements on the Phase Stability and Mechanical Behavior of Intermetallics. Alloying with interstitial elements O, N, or C induced structural changes from the A15 crystal structure to the ordered fcc L1sub 2 or L1sub2 structures in 16 alloy systems. The L1sub 2 or L1sub 2 structures exhibited higher fracture toughness values than those of the original A15 structure compounds. jg

Descriptors:

• *STABILITY
• *INTERSTITIAL
• *PHASE
• *CHEMICAL ELEMENTS
• *INTERMETALLIC COMPOUNDS
• MECHANICAL PROPERTIES
• CRYSTAL STRUCTURE
• STRUCTURAL PROPERTIES
• TOUGHNESS
• CARBON
• ALLOYS
• FRACTURE(MECHANICS)
• NITROGEN
• OXYGEN
• VALENCE
• ATOMIC STRUCTURE

Subject Categories:

• Inorganic Chemistry
• Organic Chemistry
• Physical Chemistry
• Crystallography
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE