Accession Number:

AD0726424

Title:

Aluminum Matrix Controlled Eutectics.

Descriptive Note:

Progress rept. no. 1,

Corporate Author:

NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AERO MATERIALS DEPT

Personal Author(s):

• Thomas,Marshall K.
• Trabocco,Ronald E.

Report Date:

1971-03-01

Pagination or Media Count:

28.0

Abstract:

Controlled eutectic Al-Si ingots were grown. Under the growth conditions of the investigation, it was necessary to raise the silicon content from 11.7 to 15.4 weight percent to eliminate aluminum dendrites. Fibrous, flake, and complex lamellar structures were observed in these ingots and appear to be a function of growth parameters and composition. Improvements in equipment and experimental technique will be necessary to provide more uniform growth speed, reduce oxidation, and insure homogeneity in composition. Author

Descriptors:

• (*ALUMINUM ALLOYS
• *EUTECTICS)
• SILICON ALLOYS
• GERMANIUM ALLOYS
• FREEZING
• GRAIN STRUCTURES(METALLURGY)

Subject Categories:

• Laminates and Composite Materials
• Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE