Quantitative analysis of {delta}{prime} precipitation kinetics in Al-Li alloys
The Rietveld method has been applied to X-ray spectra in order to study the precipitated mass fraction of {delta}{prime} and {delta} in Al-Li alloys. The method allows us to obtain quantitatively the {delta}{prime} and {delta} precipitate mass fractions, and their evolution with aging time. Furthermore, this method also gives directly the cell parameter evolution of the matrix phase and indirectly the mean half radius of {delta}{prime} precipitates through an appropriate calibration curve. Experimentally, this calibration has been approached by previously studying the evolution of the mean half radius of {delta}{prime} by transmission electron microscopy (TEM). Thermoelectric power has also been shown to be a powerful technique to study the microstructural evolution of Al-Li alloys, being sensitive to the different stages of precipitation associated to the {delta}{prime} and {delta} phases. The comparison of the different experimental results allow us to establish a clear difference between the precipitation kinetics and the hardening kinetics.
- Research Organization:
- Univ. del Pais Vasco, Bilbao (ES)
- OSTI ID:
- 20020581
- Journal Information:
- Acta Materialia, Vol. 48, Issue 6; Other Information: PBD: 3 Apr 2000; ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
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