Determination of precipitate nucleation and growth rates from ultrasonic harmonic generation

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 i...

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Bibliographic Details
Published in:Applied physics letters 2000-09, Vol.77 (13), p.1952-1954
Main Authors: Cantrell, John H., Yost, William T.
Format: Article
Language:English
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Summary: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′ precipitation during the artificial aging of AA2024 yields a constant nucleation rate of 5.4×1015 m−3 s−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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1311951