Article ; Online: High-Strength Nanotwinned Al Alloys with 9R Phase.
Advanced materials (Deerfield Beach, Fla.)
2018 Volume 30, Issue 11
Abstract: Light-weight aluminum (Al) alloys have widespread applications. However, most Al alloys have inherently low mechanical strength. Nanotwins can induce high strength and ductility in metallic materials. Yet, introducing high-density growth twins into Al ... ...
| Abstract | Light-weight aluminum (Al) alloys have widespread applications. However, most Al alloys have inherently low mechanical strength. Nanotwins can induce high strength and ductility in metallic materials. Yet, introducing high-density growth twins into Al remains difficult due to its ultrahigh stacking-fault energy. In this study, it is shown that incorporating merely several atomic percent of Fe solutes into Al enables the formation of nanotwinned (nt) columnar grains with high-density 9R phase in Al(Fe) solid solutions. The nt Al-Fe alloy coatings reach a maximum hardness of ≈5.5 GPa, one of the strongest binary Al alloys ever created. In situ uniaxial compressions show that the nt Al-Fe alloys populated with 9R phase have flow stress exceeding 1.5 GPa, comparable to high-strength steels. Molecular dynamics simulations reveal that high strength and hardening ability of Al-Fe alloys arise mainly from the high-density 9R phase and nanoscale grain sizes. |
|---|---|
| Language | English |
| Publishing date | 2018-01-22 |
| Publishing country | Germany |
| Document type | Journal Article |
| ZDB-ID | 1474949-X |
| ISSN | 1521-4095 ; 0935-9648 |
| ISSN (online) | 1521-4095 |
| ISSN | 0935-9648 |
| DOI | 10.1002/adma.201704629 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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