Quantitative analysis of {delta}{prime} precipitation kinetics in Al-Li alloys

Journal Article · Mon Apr 03 04:00:00 EDT 2000 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(99)00421-8· OSTI ID:20020581

Perez-Landazabal, J I; No, M L; Madariaga, G; Recarte, V; San Juan, J

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, Journal Name: Acta Materialia Journal Issue: 6 Vol. 48; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ELECTRON MICROSCOPY
KINETICS
LITHIUM ALLOYS
MICROSTRUCTURE
PRECIPITATION
X-RAY DIFFRACTION