Accession Number:

ADA063005

Title:

A Fundamental Study of Precipitates and the Influence of their Crystal Structure on the Strength of Age-Hardenable Aluminum-Lithium Alloys.

Descriptive Note:

Final rept. 25 Nov 1977-23 Nov 1978

Corporate Author:

DUKE UNIV DURHAM NC DEPT OF MECHANICALENGINEERING AND MATERIALS SCIENCE

Personal Author(s):

• Shepard, Marion L.
• Cocks, Franklin H.

Report Date:

1978-11-01

Pagination or Media Count:

10.0

Abstract:

From the results obtained in this study, it is apparent that A1-Cu-Li alloys are amenable to electrochemical extraction. A Combination of extracting to a powder and x-ray diffractometer scanning should produce optimum results. Confirmation of this should then allow a determination of the effects of minor alloying additions on the precipitated phases in A1-Cu-Li and A1-Li alloys, an evaluation of the sequential development of these phases during age-hardening as a function of both lithium content and aging temperature, and an assessment of the influence of the precipitates, as well as insolubles and dispersoids, on fracture toughness.

Descriptors:

• *CRYSTAL STRUCTURE
• *ALUMINUM ALLOYS
• *COPPER ALLOYS
• *SOLVENT EXTRACTION
• *INTERMETALLIC COMPOUNDS
• *LITHIUM ALLOYS
• *PRECIPITATES
• MECHANICAL PROPERTIES
• AGING(MATERIALS)
• X RAY DIFFRACTION
• FRACTURE(MECHANICS)
• HARDENING

Subject Categories:

• Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE