Abstract
This work assesses the effect of Ce additions on the thermal stability of the Ω phase in an aluminum alloy matrix composite. Several additions of Ce, up to 1.5 wt. %, were made to an AA205 alloy, a novel MMC, and the thermal stability of the Ω phase tested at 230 °C, for up to 100 hours. Microstructural evaluation was carried out with optical microscopy and scanning electron microscopy (SEM). In addition, hardness tests were carried out during the 100 hours. The results showed that when the reinforcement particles were present in the alloy, the Ce did not have any beneficial effects on mechanical properties. In particular, the Ce poisoned the grain refinement of the alloy by nucleating around the TiB2 particles. Energy dispersive X-ray spectroscopy (EDS) suggested the Ce-phase to be CeTi2Al20.
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Melotti, F., Dustan, A., Hirst, T., Griffiths, W.D. (2015). Effects of Ce on the Thermal Stability of the Ω Phase in a Cast Aluminum Metal Matrix Composite. In: Nastac, L., et al. Advances in the Science and Engineering of Casting Solidification. Springer, Cham. https://doi.org/10.1007/978-3-319-48117-3_17
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DOI: https://doi.org/10.1007/978-3-319-48117-3_17
Publisher Name: Springer, Cham
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Online ISBN: 978-3-319-48117-3
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