Microstructure and Mechanical Properties of a Precipitation-Hardened Al–Mn–Zr–Er Alloy

Amir R. Farkoosh*, David N. Seidman, David C. Dunand

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Commercial aluminum alloys are unusable above ~250 °C (523 K, which is 56% of the absolute melting point of aluminum, Tm = 933 K), due mainly to the rapid coarsening/dissolution of their fine strengthening precipitates. The recently developed L12-strengthened alloys exhibit, however, a significantly better coarsening resistance at high temperatures. In this study, we present a new class of L12-strengthed aluminum alloys based on the Al–Mn–Zr–Er system, which exhibits an exceptional combination of high-creep and high coarsening resistance at 300 °C. The microstructure of the isochronally peak-aged alloys has been studied over relevant length scales utilizing scanning electron microscopy (SEM) and local-electrode atom-probe (LEAP) tomography, in parallel with microhardness measurements. Compressive creep experiments are performed to determine the creep threshold stresses of these alloys at 300 °C.

Original languageEnglish (US)
Title of host publicationLight Metals 2021 - 50th Anniversary Edition
EditorsLinus Perander
PublisherSpringer Science and Business Media Deutschland GmbH
Pages239-244
Number of pages6
ISBN (Print)9783030653958
DOIs
StatePublished - 2021
EventLight Metals Symposium held at the TMS Annual Meeting and Exhibition, 2021 - Pittsburgh, United States
Duration: Mar 15 2021Mar 18 2021

Publication series

NameMinerals, Metals and Materials Series
Volume6
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

ConferenceLight Metals Symposium held at the TMS Annual Meeting and Exhibition, 2021
Country/TerritoryUnited States
CityPittsburgh
Period3/15/213/18/21

Funding

This research was supported by the Office of Naval Research (N00014-18-1-2550). Atom-probe tomography was performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The LEAP tomograph at NUCAPT was purchased and upgraded with grants from the NSF-MRI (DMR-0420532) and ONR-DURIP (N00014-0400798, N00014-0610539, N00014-0910781, N00014-1712870) programs. NUCAPT received support from the MRSEC program (NSF DMR-1720139) at the Materials Research Center, the SHyNE Resource (NSF ECCS-1542205), and the Initiative for Sustainability and Energy (ISEN) at Northwestern University. This work made use of the Materials Characterization and Imaging Facility which receives support from the MRSEC Program (NSF DMR-1720139) of the Materials Research Center at Northwestern University. This work made use of the EPIC facility of Northwestern University’s NUANCE Center, which has received support from the MRSEC program NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); and the State of Illinois, through the IIN. Research professor Dieter Isheim is thanked for managing NUCAPT. Acknowledgements This research was supported by the Office of Naval Research (N00014-18-1-2550). Atom-probe tomography was performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The LEAP tomograph at NUCAPT was purchased and upgraded with grants from the NSF-MRI (DMR-0420532) and ONR-DURIP (N00014-0400798, N00014-0610539, N00014-0910781, N00014-1712870) programs. NUCAPT received support from the MRSEC program (NSF DMR-1720139) at the Materials Research Center, the SHyNE Resource (NSF ECCS-1542205), and the Initiative for Sustainability and Energy (ISEN) at Northwestern University. This work made use of the Materials Characterization and Imaging Facility which receives support from the MRSEC Program (NSF DMR-1720139) of the Materials Research Center at Northwestern University. This work made use of the EPIC facility of Northwestern University’s NUANCE Center, which has received support from the MRSEC program NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); and the State of Illinois, through the IIN. Research professor Dieter Isheim is thanked for managing NUCAPT.

Keywords

  • Aluminum alloys
  • Coarsening kinetics
  • Creep resistance
  • High-temperature alloys
  • L1 nanoprecipitates
  • Mechanical properties
  • Scandium
  • Solid-solution strengthening
  • Zirconium

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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