TITLE

Nonlinear acoustical assessment of precipitate nucleation and growth in aluminum alloy 2024

AUTHOR(S)
Cantrell, John H.; Yost, William T.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1375
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The nucleation and growth of precipitates in heat treatable aluminum alloys is in large measure responsible for the high strength-to-weight ratios that make such materials amenable for use as aircraft structural materials. An analytical model developed for the effects on the acoustic nonlinearity of the interaction of matrix dislocations with precipitate coherency strains in metallic alloys is applied to an assessment of the nucleation and growth of GP zones and S prime precipitates during the heat treatment of aluminum alloy 2024. The acoustic nonlinearity parameters are shown to depend linearly on the dislocation density, volume fraction of precipitates and precipitate-matrix misfit parameters, and on the fourth power of the dislocation loop length during the growth of precipitates, but depend inversely on the cubic root of the volume fraction of precipitates formed during the nucleation phase of precipitation. This information is used to assess the reversion rate of GP zones and the nucleation and growth rates of S prime precipitates in AA2024 during artificial aging. © 2000 American Institute of Physics.
ACCESSION #
6029248

 

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