@article{b6de9dcdbcec46ba88f7b17caee90ff9,
title = "Aging- and creep-resistance of a cast hypoeutectic Al-6.9Ce-9.3Mg (wt.%) alloy",
abstract = "A ternary Al-6.9Ce-9.3Mg (wt.%) hypoeutectic alloy, consisting of equal amounts of α-Al(Mg) solid-solution regions and Al(Mg)-Al11Ce3 eutectic colonies, is investigated in terms of its aging and creep resistance. The eutectic regions exhibit a microhardness of 1230 MPa, which is thrice the value of Al-Al11Ce3 eutectic regions in a binary Al-12.5Ce (wt.%) near-eutectic alloy, demonstrating that Mg in solid-solution enhances the strengthening provided by the micron-scale highly-branched Al11Ce3 phase. X-ray diffraction measurements during ambient-temperature tensile testing reveal that load is being transferred from the Al(Mg) matrix to the Al11Ce3 phase, confirming that the fine eutectic microstructure displays composite strengthening in addition to the expected precipitation- and solid-solution strengthening. The hardness remains effectively unchanged after aging at 450 °C for up to 8 weeks, indicating excellent coarsening resistance of the Al11Ce3 phase. The ternary alloy exhibits creep resistance at 300 °C slightly inferior to the near-fully eutectic binary Al-12.5Ce (wt.%) alloy, consistent with the presence of large regions of fast-creeping primary Al(Mg) solid-solution matrix between the strong Al(Mg)-Al11Ce3 eutectic colonies in the hypoeutectic ternary alloy.",
keywords = "Al alloys, Creep, Load partitioning, Precipitation hardening, Rare earth",
author = "Ng, {Daniel S.} and Dunand, {David C.}",
note = "Funding Information: DSN received support from the Combat Capabilities Development Command - Army Research Laboratory via the Army Educational Outreach Program. The authors thank Dr. David Weiss from Eck Industries, Inc. for providing the cast Al-Ce-Mg alloys, Dr. Jun-Sang Park for support during measurements at the 1-ID-C beamline of the Advanced Photon Source (APS) and Dr. Jon Erik Mogonye (ARL) for numerous useful discussions. The use of APS, an Office of Science User Facility operated by Argonne National Laboratory, was supported by the U.S. DOE under contract DE-AC02-06CH11357 . This work made use of the Materials Characterization and Imaging Facility at Northwestern University, which receives support from the MRSEC Program ( NSF DMR-1720139 ) of the Materials Research Center at Northwestern University. This work made also use of the EPIC facility of Northwestern University's NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental ( SHyNE ) Resource ( NSF ECCS-1542205 ); the MRSEC Program; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. Funding Information: DSN received support from the Combat Capabilities Development Command - Army Research Laboratory via the Army Educational Outreach Program. The authors thank Dr. David Weiss from Eck Industries, Inc. for providing the cast Al-Ce-Mg alloys, Dr. Jun-Sang Park for support during measurements at the 1-ID-C beamline of the Advanced Photon Source (APS) and Dr. Jon Erik Mogonye (ARL) for numerous useful discussions. The use of APS, an Office of Science User Facility operated by Argonne National Laboratory, was supported by the U.S. DOE under contract DE-AC02-06CH11357. This work made use of the Materials Characterization and Imaging Facility at Northwestern University, which receives support from the MRSEC Program (NSF DMR-1720139) of the Materials Research Center at Northwestern University. This work made also use of the EPIC facility of Northwestern University's NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC Program; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",
year = "2020",
month = jun,
day = "1",
doi = "10.1016/j.msea.2020.139398",
language = "English (US)",
volume = "786",
journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier BV",
}