Accession Number:

AD0256050

Title:

ACOUSTICAL STUDY OF QUENCH-AGING IN ALPHA CU-AL ALLOYS

Descriptive Note:

Corporate Author:

NORTHWESTERN UNIV EVANSTON ILL TECHNOLOGICAL INST

Report Date:

1961-04-12

Pagination or Media Count:

1.0

Abstract:

Youngs modulus at 21 C in quenched alpha Cu-Al alloys increases with time. This correlates with a decrease in resistivity which has been attributed to vacancy enhanced diffusion and shortrange ordering. The total change in modulus during aging increases with Al content and quenching speed and is also a function of the quenching temperature. An effective activation energy of 0.69 ev was determined 38 minutes after quenching. This is an effective energy of motion for the point defects involved in the diffusion process at this point in the reaction. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE