Ambient- and elevated temperature properties of Sc- and Zr-modified Al–6Ni alloys strengthened by Al3Ni microfibers and Al3(Sc,Zr) nanoprecipitates

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Publication Details

Author list: Suwanpreecha C., Rakhmonov J.U., Chankitmunkong S., Pandee P., Dunand D.C., Limmaneevichitr C.

Publisher: Elsevier

Publication year: 2022

Journal: Materials Science and Engineering: A (0921-5093)

Volume number: 841

Start page: 142963

End page: 142963

Number of pages: 1

ISSN: 0921-5093

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85126942484&doi=10.1016%2fj.msea.2022.142963&partnerID=40&md5=c204e28eaf92eff5650049acc191a0b7

Languages: English-Great Britain (EN-GB)

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Abstract

The eutectic Al–6Ni (wt.%) alloy exhibits excellent strength at ambient and elevated temperature, provided by a high volume fraction of Al3Ni microfibers formed during solidification. Here, Al–6Ni is micro-alloyed with Sc and Zr (with 0.1Sc+0.2Zr, 0.2Sc+0.4Zr and 0.3Sc+0.2Zr, wt.%), creating two additional populations of primary and secondary Al3(Sc,Zr) precipitates. The fully eutectic microstructure (α-Al + Al3Ni) observed in Al–6Ni alloy changes, with Sc and Zr addition to hypoeutectic microstructure with primary α-Al grains nucleated on solidification by primary Al3(Sc,Zr) precipitates. Upon subsequent aging, fully-coherent Al3(Sc,Zr) nanoprecipitates form in the α-Al matrix between Al3Ni microfibers, providing substantial precipitation strengthening, which is maintained for up to 1 month at 350 °C. Alloy strength - both at ambient temperature and during creep at 300 °C - can be quantitatively described through a superposition of precipitation strengthening by Al3(Sc,Zr) nanoprecipitates and load-transfer strengthening by Al3Ni microfibers. © 2022 Elsevier B.V.

Keywords

Aluminum alloy