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 language | English (US) |
---|---|
Title of host publication | Light Metals 2021 - 50th Anniversary Edition |
Editors | Linus Perander |
Publisher | Springer Science and Business Media Deutschland GmbH |
Pages | 239-244 |
Number of pages | 6 |
ISBN (Print) | 9783030653958 |
DOIs | |
State | Published - 2021 |
Event | Light Metals Symposium held at the TMS Annual Meeting and Exhibition, 2021 - Pittsburgh, United States Duration: Mar 15 2021 → Mar 18 2021 |
Publication series
Name | Minerals, Metals and Materials Series |
---|---|
Volume | 6 |
ISSN (Print) | 2367-1181 |
ISSN (Electronic) | 2367-1696 |
Conference
Conference | Light Metals Symposium held at the TMS Annual Meeting and Exhibition, 2021 |
---|---|
Country/Territory | United States |
City | Pittsburgh |
Period | 3/15/21 → 3/18/21 |
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