Isothermal aging of Al-Ni-Sc alloy containing Al3Ni microfibers and Al3Sc nanoprecipitates
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Author list: Suwanpreecha C., Toinin J.P., Pandee P., Dunand D.C., Limmaneevichitr C.
Publication year: 2019
Journal: Journal of Metals, Materials and Minerals (0857-6149)
Volume number: 29
Issue number: 2
Start page: 37
End page: 41
Number of pages: 5
ISSN: 0857-6149
Languages: English-Great Britain (EN-GB)
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Abstract
Binary Al-Sc alloys have excellent strength at room and elevated temperature up to 300ฐC due to coherent of Al3Sc nanoprecipitates. Binary Al-Ni alloys are an alternative alloy for high-temperature applications owing to high-thermal stability of Al3Ni microfibers. In this study, the hardness evolution at 300ฐC for up to 672 h for eutectic ternary Al-6Ni-0.4Sc (wt%) was studied and compared with binary Al-0.4Sc and Al-6Ni alloys. The Al-6Ni alloy maintains a constant hardness after aging at 300ฐC up to 672 h. Both Al-0.4Sc and Al-6Ni-0.4Sc alloys show strong precipitation strengthening response, with peak hardness reached after about 3 h aging, due to Al3Sc precipitates. These precipitates were studied in Al-6Ni-0.4Sc via local electrode atom probe tomography and contain small amounts of Ni (0.04 at%) which do not affect the kinetics of precipitation. The microhardness evolution for Al-6Ni-0.4Sc can be explained through superposition of binary Al-0.4Sc and Al-6Ni alloys, indicating that both Al3Sc nanoprecipitates and Al3Ni microfibers contribute to strength. ฉ 2019 Chulalognkorn University.
Keywords
Al-Ni-Sc alloy, Precipitation strengthening
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