Abstract
Existing additively manufactured aluminum alloys exhibit poor creep resistance due to coarsening of their strengthening phases and refined grain structures. In this paper, we report on a novel additively manufactured Al-10.5Ce-3.1Ni-1.2Mn wt.% alloy which displays excellent creep resistance relative to cast high-temperature aluminum alloys at 300–400 °C. The creep resistance of this alloy is attributed to a high volume fraction (∼35%) of submicron intermetallic strengthening phases which are coarsening-resistant for hundreds of hours at 350 °C. The results herein demonstrate that additive manufacturing provides opportunities for development of creep-resistant aluminum alloys that may be used in bulk form in the 250–400 °C temperature range. Pathways for further development of such alloys are identified.
| Original language | English |
|---|---|
| Article number | 117699 |
| Journal | Acta Materialia |
| Volume | 227 |
| DOIs | |
| State | Published - Apr 1 2022 |
Funding
Notice: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( https://www.energy.gov/downloads/doe-public-access-plan ) Research was co-sponsored the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office and Vehicle Technologies Office Propulsion Materials Program. APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. The authors would like to thank James Burns for assistance in performing APT sample preparation and running the APT experiments, Kelsey Hedrick and Shane Hawkins for performing the tensile tests, Dana McClurg for performing the heat treatments, Travis Dixon for electropolishing TEM samples, Christina Austin for assistance in performing the creep tests, and Sebastien Dryepondt and Yukinori Yamamoto for providing technical reviews of the manuscript.
Keywords
- Additive manufacturing
- Al-Ce-Ni-Mn alloy
- Aluminum alloys
- Creep
- High-temperature materials
