High‐Strength Nanotwinned Al Alloys with 9R Phase
Abstract
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.
- Authors:
-
[1];
- School of Materials Engineering Purdue University West Lafayette IN 47907 USA
- Mechanical and Materials Engineering University of Nebraska‐Lincoln Lincoln NE 68588 USA
- Mechanical and Industrial Engineering Louisiana State University Baton Rouge LA 70803 USA
- Division of Engineering and Applied Science California Institute of Technology Pasadena CA 91125 USA
- Oak Ridge National Laboratory Oak Ridge TN 37830 USA
- State Key Lab of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1417710
- Grant/Contract Number:
- DE‐SC0016337
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Advanced Materials
- Additional Journal Information:
- Journal Name: Advanced Materials Journal Volume: 30 Journal Issue: 11; Journal ID: ISSN 0935-9648
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
Citation Formats
Li, Qiang, Xue, Sichuang, Wang, Jian, Shao, Shuai, Kwong, Anthony H., Giwa, Adenike, Fan, Zhe, Liu, Yue, Qi, Zhimin, Ding, Jie, Wang, Han, Greer, Julia R., Wang, Haiyan, and Zhang, Xinghang. High‐Strength Nanotwinned Al Alloys with 9R Phase. Germany: N. p., 2018.
Web. doi:10.1002/adma.201704629.
Li, Qiang, Xue, Sichuang, Wang, Jian, Shao, Shuai, Kwong, Anthony H., Giwa, Adenike, Fan, Zhe, Liu, Yue, Qi, Zhimin, Ding, Jie, Wang, Han, Greer, Julia R., Wang, Haiyan, & Zhang, Xinghang. High‐Strength Nanotwinned Al Alloys with 9R Phase. Germany. https://doi.org/10.1002/adma.201704629
Li, Qiang, Xue, Sichuang, Wang, Jian, Shao, Shuai, Kwong, Anthony H., Giwa, Adenike, Fan, Zhe, Liu, Yue, Qi, Zhimin, Ding, Jie, Wang, Han, Greer, Julia R., Wang, Haiyan, and Zhang, Xinghang. Mon .
"High‐Strength Nanotwinned Al Alloys with 9R Phase". Germany. https://doi.org/10.1002/adma.201704629.
@article{osti_1417710,
title = {High‐Strength Nanotwinned Al Alloys with 9R Phase},
author = {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},
abstractNote = {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.},
doi = {10.1002/adma.201704629},
journal = {Advanced Materials},
number = 11,
volume = 30,
place = {Germany},
year = {Mon Jan 22 00:00:00 EST 2018},
month = {Mon Jan 22 00:00:00 EST 2018}
}
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