Accession Number : AD0292269

Title :   AGING STUDY OF 2024 ALUMINUM BY DYNAMIC MODULUS TECHNIQUES

Corporate Author : AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : KING,G.W.

Report Date : NOV 1962

Pagination or Media Count : 1

Abstract : Dynamic modulus measurements are used to study precipitation rates in 2024 Al alloy. The results are discussed in terms of the effect of structural changes on the elastic modulus as well as the kinetics of precipitation at various stages of the age-hardening process. Activation energies were determined for aging in the temperature ranges from room (77 F) to 130 F, and 375 F to 425 F. A value of 20.7 kcal/gm mole was obtained for the lower temperature range, and 23 kcal/gm mole for the higher temperatures. The data indicate that modulus changes are primarily influenced by the structure of the second phase, however, some evidence of strain energy effects are indicated. (Author)

Descriptors :   *ALPHA SPECTRA, ATMOSPHERIC PRECIPITATION, CHEMICAL PRECIPITATION, DYNAMICS, ELASTIC PROPERTIES, MECHANICAL PROPERTIES, MOLECULAR ASSOCIATION, NONDESTRUCTIVE TESTING, PHASE STUDIES, PIEZOELECTRIC TRANSDUCERS, STRESSES, TEST METHODS

Distribution Statement : APPROVED FOR PUBLIC RELEASE