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Title: High-Strength Nanotwinned Al Alloys with 9R Phase

Authors:
ORCiD logo [1];  [1];  [2];  [3];  [4];  [4];  [5];  [6];  [1];  [1];  [1];  [4];  [1];  [1]
  1. School of Materials Engineering, Purdue University, West Lafayette IN 47907 USA
  2. Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln NE 68588 USA
  3. Mechanical and Industrial Engineering, Louisiana State University, Baton Rouge LA 70803 USA
  4. Division of Engineering and Applied Science, California Institute of Technology, Pasadena CA 91125 USA
  5. Oak Ridge National Laboratory, Oak Ridge TN 37830 USA
  6. 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:
SC0016337
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Related Information: CHORUS Timestamp: 2018-01-22 11:49:58; 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. 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, and Zhang, Xinghang. 2018. "High-Strength Nanotwinned Al Alloys with 9R Phase". Germany. doi: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 = {},
doi = {10.1002/adma.201704629},
journal = {Advanced Materials},
number = ,
volume = ,
place = {Germany},
year = 2018,
month = 1
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on January 22, 2019
Publisher's Accepted Manuscript

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  • We report on the synthesis of epitaxial (single-crystal-like), nanotwinned Cu films via magnetron sputtering. Increasing the deposition rate from 1 to 4 nm/s decreased the average twin lamellae spacing from 16 to 7 nm. These epitaxial nanotwinned Cu films exhibit significantly higher ratio of hardness to room temperature electrical resistivity than columnar grain (nanocrystalline), textured, nanotwinned Cu films.
  • Nanotwinned ultrafine grained Ag thick films with different twin densities and orientations have been synthesized by magnetron sputtering with a wide-range of deposition rates. The twin boundary (TB) spacings and orientations as well as the grain size for the different deposition conditions have been characterized by both synchrotron X-ray scattering and transmission electron microscopy (TEM). Structural characterization combined with uniaxial tensile tests of the free-standing films reveals a large increase in the yield strength for films deposited at high deposition rates without any accompanying change in the TB spacing – a behavior that is in contrast with what has beenmore » reported in the literature. We find that films deposited at lower deposition rates exhibit more randomly oriented grains with a lower overall twin density (averaged over all the grains) than the more heavily twinned grains with strong <111> fiber texture in the films deposited at higher deposition rates. The TB spacing in the twinned grains, however, does not show any significant dependence on the deposition rate. The dependence of the strength and ductility on the twin density and orientations can be described by two different soft deformation modes: 1) untwinned grains and 2) nanowinned grains that are not oriented with <111> along the growth direction. The untwinned grains provide relatively low resistance to slip, and thus decreased strength, while the nanotwinned grains that are not oriented with <111> along the growth direction are softer than nanotwinned grains that are oriented with <111> along the growth direction. We reveal that an ultrafine-grained (150-200 nm) structure consisting of a mixture of nanotwinned (~ 8-12 nm spacing) and untwined grains yields the best combination of high strength and uniform tensile ductility.« less