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High-Strength Nanotwinned Al Alloys with 9R Phase

Li, Qiang and Xue, Sichuang and Wang, Jian and Shao, Shuai and Kwong, Anthony H. and Giwa, Adenike and Fan, Zhe and Liu, Yue and Qi, Zhimin and Ding, Jie and Wang, Han and Greer, Julia R. and Wang, Haiyan and Zhang, Xinghang (2018) High-Strength Nanotwinned Al Alloys with 9R Phase. Advanced Materials, 30 (11). Art. No. 1704629. ISSN 0935-9648.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Shao, Shuai0000-0002-9525-6310
Ding, Jie0000-0002-3584-6140
Greer, Julia R.0000-0002-9675-1508
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.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0016337
Office of Naval Research (ONR)N000141310555
Subject Keywords:9R; Al alloys; high strength; in situ; molecular simulation
Issue or Number:11
Record Number:CaltechAUTHORS:20180129-083003785
Persistent URL:
Official Citation:Q. Li, S. Xue, J. Wang, S. Shao, A. H. Kwong, A. Giwa, Z. Fan, Y. Liu, Z. Qi, J. Ding, H. Wang, J. R. Greer, H. Wang, X. Zhang, Adv. Mater. 2018, 30, 1704629.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84553
Deposited By: Tony Diaz
Deposited On:30 Jan 2018 13:27
Last Modified:09 Mar 2020 13:19

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