TY - JOUR
T1 - Ambient- and elevated temperature properties of Sc- and Zr-modified Al–6Ni alloys strengthened by Al3Ni microfibers and Al3(Sc,Zr) nanoprecipitates
AU - Suwanpreecha, C.
AU - Rakhmonov, J. U.
AU - Chankitmunkong, S.
AU - Pandee, P.
AU - Dunand, D. C.
AU - Limmaneevichitr, C.
N1 - Funding Information:
CS acknowledges the support of King Mongkut's University of Technology Thonburi through the “Petchra Pra Jom Klao Doctoral Scholarship” [Grant No. 01/2557]. The authors sincerely thanks Dr. Ussadawut Patakham (National Metal and Material Technology Center, National Sciences and Technology Development Agency, Thailand) for his support. JUR and DCD acknowledge the financial support from the US Army Research Laboratory through award W911NF-19-2-0092. This work made use of the EPIC facility of Northwestern University's NUANCE Center, which has received support from the SHyNE Resource (NSF ECCS-2025633), the IIN (NIH–S10OD026871), and Northwestern's MRSEC program (NSF DMR-1720139). PP and CL acknowledge the financial support from Thailand Science Research and Innovation (TSRI) under Fundamental Fund 2022 (Project: Advanced Materials and Manufacturing for Applications in New S-curve Industries).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/4/28
Y1 - 2022/4/28
N2 - 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.
AB - 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.
KW - Aging
KW - Al-Ni-Sc-Zr
KW - Aluminum alloys
KW - Creep
KW - Eutectic strengthening
KW - Load transfer
KW - Precipitation hardening
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U2 - 10.1016/j.msea.2022.142963
DO - 10.1016/j.msea.2022.142963
M3 - Article
C2 - 36440181
AN - SCOPUS:85126942484
SN - 0921-5093
VL - 841
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
M1 - 142963
ER -