TITLE

Determination of precipitate nucleation and growth rates from ultrasonic harmonic generation

AUTHOR(S)
Cantrell, John H.; Cantrell, John C.; Yost, William T.
PUB. DATE
September 2000
SOURCE
Applied Physics Letters;9/25/2000, Vol. 77 Issue 13
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
An analytical model based on precipitate-dislocation interactions is presented that predicts a decrease in ultrasonic harmonic generation during the nucleation of precipitates and an increase during precipitate growth up to the point of precipitate-matrix coherency loss. The opposing effects allow independent, indirect assessments of nucleation and growth rates from a curve fit of the model equation to experimental data. Application to the assessment of S[sup ′] precipitation during the artificial aging of AA2024 yields a constant nucleation rate of 5.4x10[sup 15] m[sup -3] s[sup -1] and a growth rate increasing as the 1.2 power of time in the range 72-432 min during heat treatment at 463 K.
ACCESSION #
4414927

 

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