Abstract
Precipitate strengthened high-temperature alloys are currently used in safety-critical applications. Understanding precipitate stability and solute segregation mechanisms at high temperatures is key to designing high-strength alloys. Rapid in-situ approaches, therefore, are pivotal in accelerating the alloy design process. Hereby using the test case of a promising high-temperature Al-Cu-Mn-Zr alloy, we demonstrate the value of in-situ atom probe tomography coupled with in-situ transmission electron microscopy to reveal atomic-scale mechanisms that lead to the emergence of non-equilibrium solute segregation. Mn and Zr segregation at strengthening precipitate(θ’)-matrix interface increases the kinetic barrier for phase transformation thus retaining high-temperature strength.
| Original language | English |
|---|---|
| Pages (from-to) | 771-779 |
| Number of pages | 9 |
| Journal | Materials Research Letters |
| Volume | 10 |
| Issue number | 12 |
| DOIs | |
| State | Published - 2022 |
Funding
This work was supported by Department of Energy Vehicle Technology Office as a part of powertrain materials core program. The FIB preparation of APT samples and APT analysis was conducted using facilities at Environmental Molecular Sciences Laboratory (EMSL) which is a national user facility located at PNNL. EMSL is supported by DOE Biological and Environmental Research (BER) program. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. Research was co-sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office and Vehicle Technologies Office as a part of powertrain Materials core Program. The research was sponsored by the Powertrain Materials Core Program, under the Propulsion Materials Program (managed by Jerry Gibbs), Vehicle Technologies Office, US Department of Energy (DOE). The microstructural characterization was conducted at Environmental Molecular Sciences Laboratory (EMSL) a DOE national user facility funded by the Biological and Environmental Research Office (BER) located at PNNL. The research was sponsored by the Powertrain Materials Core Program, under the Propulsion Materials Program (managed by Jerry Gibbs), Vehicle Technologies Office, US Department of Energy (DOE). The microstructural characterization was conducted at Environmental Molecular Sciences Laboratory (EMSL) a DOE national user facility funded by the Biological and Environmental Research Office (BER) located at PNNL.
| Funders | Funder number |
|---|---|
| Jerry Gibbs | |
| U.S. Department of Energy | |
| Advanced Manufacturing Office | |
| Office of Energy Efficiency and Renewable Energy | |
| Biological and Environmental Research | DE-AC05-00OR22725 |
| Pacific Northwest National Laboratory |
Keywords
- Solute-segregation
- atom probe tomography
- in-situ characterization
- phase transformation
- structural materials