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Title: High-velocity projectile impact induced 9R phase in ultrafine-grained aluminium

Abstract

Aluminium typically deforms via full dislocations due to its high stacking fault energy. Twinning in aluminium, although difficult, may occur at low temperature and high strain rate. However, the 9R phase rarely occurs in aluminium simply because of its giant stacking fault energy. Here, by using a laser-induced projectile impact testing technique, we discover a deformation-induced 9R phase with tens of nm in width in ultrafine-grained aluminium with an average grain size of 140 nm, as confirmed by extensive post-impact microscopy analyses. The stability of the 9R phase is related to the existence of sessile Frank loops. Molecular dynamics simulations reveal the formation mechanisms of the 9R phase in aluminium. This study sheds lights on a deformation mechanism in metals with high stacking fault energies.

Authors:
 [1];  [1];  [2]; ORCiD logo [2]; ORCiD logo [1];  [3];  [4];  [5];  [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Rice Univ., Houston, TX (United States)
  3. Shanghai Jiao Tong Univ. (China)
  4. China Univ. of Petrolium, Beijing (China)
  5. Univ. of Nebraska, Lincoln, NE (United States)
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1515551
Grant/Contract Number:  
SC0016337
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Xue, Sichuang, Fan, Zhe, Lawal, Olawale B., Thevamaran, Ramathasan, Li, Qiang, Liu, Yue, Yu, K. Y., Wang, Jian, Thomas, Edwin L., Wang, Haiyan, and Zhang, Xinghang. High-velocity projectile impact induced 9R phase in ultrafine-grained aluminium. United States: N. p., 2017. Web. doi:10.1038/s41467-017-01729-4.
Xue, Sichuang, Fan, Zhe, Lawal, Olawale B., Thevamaran, Ramathasan, Li, Qiang, Liu, Yue, Yu, K. Y., Wang, Jian, Thomas, Edwin L., Wang, Haiyan, & Zhang, Xinghang. High-velocity projectile impact induced 9R phase in ultrafine-grained aluminium. United States. doi:10.1038/s41467-017-01729-4.
Xue, Sichuang, Fan, Zhe, Lawal, Olawale B., Thevamaran, Ramathasan, Li, Qiang, Liu, Yue, Yu, K. Y., Wang, Jian, Thomas, Edwin L., Wang, Haiyan, and Zhang, Xinghang. Tue . "High-velocity projectile impact induced 9R phase in ultrafine-grained aluminium". United States. doi:10.1038/s41467-017-01729-4. https://www.osti.gov/servlets/purl/1515551.
@article{osti_1515551,
title = {High-velocity projectile impact induced 9R phase in ultrafine-grained aluminium},
author = {Xue, Sichuang and Fan, Zhe and Lawal, Olawale B. and Thevamaran, Ramathasan and Li, Qiang and Liu, Yue and Yu, K. Y. and Wang, Jian and Thomas, Edwin L. and Wang, Haiyan and Zhang, Xinghang},
abstractNote = {Aluminium typically deforms via full dislocations due to its high stacking fault energy. Twinning in aluminium, although difficult, may occur at low temperature and high strain rate. However, the 9R phase rarely occurs in aluminium simply because of its giant stacking fault energy. Here, by using a laser-induced projectile impact testing technique, we discover a deformation-induced 9R phase with tens of nm in width in ultrafine-grained aluminium with an average grain size of 140 nm, as confirmed by extensive post-impact microscopy analyses. The stability of the 9R phase is related to the existence of sessile Frank loops. Molecular dynamics simulations reveal the formation mechanisms of the 9R phase in aluminium. This study sheds lights on a deformation mechanism in metals with high stacking fault energies.},
doi = {10.1038/s41467-017-01729-4},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {11}
}

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Cited by: 11 works
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Figures / Tables:

Fig. 1 Fig. 1: Microstructures of as-deposited ultrafine grained (UFG) Al thin film. a EBSD micrograph showing orientation map along the sample surface normal direction; the red lines indicate ∑3 twin boundaries. Scale bar, 1 µm. b The boundary rotation axis (BRA) map reveals the incoherent twin boundary (ITB) (when BRA//TB) andmore » coherent twin boundary (CTB) (when BRA⊥TB). Scale bar, 1 µm. c, d Plan-view TEM images showing growth twins in as-deposited UFG Al thin films (inset of d shows the selected area diffraction (SAD) pattern of a grain containing growth twins). Scale bar, 20 nm« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.