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

Sichuang Xue, Zhe Fan, Olawale B. Lawal, Ramathasan Thevamaran, Qiang Li, Yue Liu, K. Y. Yu, Jian Wang (), Edwin L. Thomas, Haiyan Wang and Xinghang Zhang ()
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Sichuang Xue: Purdue University
Zhe Fan: Purdue University
Olawale B. Lawal: Rice University
Ramathasan Thevamaran: Rice University
Qiang Li: Purdue University
Yue Liu: Shanghai Jiao Tong Univeristy
K. Y. Yu: China University of Petroleum
Jian Wang: University of Nebraska-Lincoln
Edwin L. Thomas: Rice University
Haiyan Wang: Purdue University
Xinghang Zhang: Purdue University

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-01729-4

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