Internal stress and microstructure of SiC reinforced aluminium alloy 2014

Journal Article · Fri Sep 18 04:00:00 EDT 1998 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(98)00212-2· OSTI ID:665186

Weiland, A; Hultman, L; Wahlstroem, U; Persson, C; Johannesson, T ^[1]

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1. Linkoeping Univ. (Sweden)

Precipitates and interfaces in a SiC particulate reinforced AA 2014 alloy have been characterized by high-resolution transmission electron microscopy and X-ray microanalysis. The kinetics of precipitation and the lattice parameter and microstress variations during ageing of the composite were studied by X-ray diffraction at elevated temperature. The kinetics of precipitation in a composite sample and a stress-free reference powder differ substantially. Thermal misfit stresses induced by SiC particulates increase the rate of precipitation by approximately a factor three, but do not influence the type or total amount of precipitates. Due to the different precipitation rates, X-ray diffraction measurements of three-dimensional stresses would be made with caution; discrepancies between the sample and the reference powder compositions may give erroneous results. There is no evidence of interfacial reactions between the particulates and the matrix alloy, or of pore formation or preferential precipitation at the interfaces.

• OSTI ID: 665186
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 15 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
COMPOSITE MATERIALS
INTERFACES
KINETICS
MICROSTRUCTURE
PRECIPITATION
SILICON CARBIDES
STRESSES
X-RAY DIFFRACTION