CaltechAUTHORS
Published March 15, 2018 | Version Supplemental Material
Journal Article Open

High-Strength Nanotwinned Al Alloys with 9R Phase

Creators

  • 1. ROR icon Purdue University West Lafayette
  • 2. ROR icon University of Nebraska–Lincoln
  • 3. ROR icon Louisiana State University
  • 4. ROR icon California Institute of Technology
  • 5. ROR icon Oak Ridge National Laboratory
  • 6. ROR icon Shanghai Jiao Tong University

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.

Additional Information

© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Received: August 15, 2017; Revised: November 4, 2017; Published online: January 22, 2018. The authors acknowledge accesses to the microscopy facilities at Purdue University and Center for Integrated Nanotechnologies (managed by Los Alamos National Laboratory). X.Z., Q.L., and S.X. acknowledge financial support by DoE-OBES under Grant No. DE-SC0016337. H.W. acknowledges the support from the Office of Naval Research (under Dr. Antti Makinen under Grant No. N000141310555). Z.F. is partially supported by NSF-DMR 1642759. The authors declare no conflict of interest.

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Additional details

Identifiers

Eprint ID
84553
DOI
10.1002/adma.201704629
Resolver ID
CaltechAUTHORS:20180129-083003785

Related works

Describes
10.1002/adma.201704629 (DOI)

Funding

Department of Energy (DOE)
DE-SC0016337
Office of Naval Research (ONR)
N000141310555
NSF
DMR-1642759

Dates

Created
2018-01-30
Created from EPrint's datestamp field
Updated
2021-11-15
Created from EPrint's last_modified field