title: Macrodeformation Twins in Single-Crystal Aluminum.
abstract: Deformation twinning in pure aluminum has been considered to be a unique property of nanostructured aluminum. A lingering mystery is whether deformation twinning occurs in coarse-grained or single-crystal aluminum at scales beyond nanotwins. Here, we present the first experimental demonstration of macrodeformation twins in single-crystal aluminum formed under an ultrahigh strain rate (∼10^{6}  s^{-1}) and large shear strain (200%) via dynamic equal channel angular pressing. Large-scale molecular dynamics simulations suggest that the frustration of subsonic dislocation motion leads to transonic deformation twinning. Deformation twinning is rooted in the rate dependences of dislocation motion and twinning, which are coupled, complementary processes during severe plastic deformation under ultrahigh strain rates.
authors.affiliation: The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.|Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, People's Republic of China.
authors.forename: F
authors.initials: F
authors.lastname: Zhao
authors.affiliation: The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.affiliation: The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.
authors.forename: D
authors.initials: D
authors.lastname: Fan
authors.affiliation: The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.|School of Science, Wuhan Univiersity of Technology, Wuhan, Hubei 430070, People's Republic of China.
authors.forename: B X
authors.initials: BX
authors.lastname: Bie
authors.affiliation: The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.
authors.forename: X M
authors.initials: XM
authors.lastname: Zhou
authors.affiliation: School of Aeronautics, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, People's Republic of China.
authors.forename: T
authors.initials: T
authors.lastname: Suo
authors.affiliation: School of Aeronautics, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, People's Republic of China.
authors.forename: Y L
authors.initials: YL
authors.lastname: Li
authors.affiliation: WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.|State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China.
authors.forename: M W
authors.initials: MW
authors.lastname: Chen
authors.affiliation: Institute of Fluid Physics, Mianyang, Sichuan 621900, People's Republic of China.
authors.forename: C L
authors.initials: CL
authors.lastname: Liu
authors.affiliation: School of Science, Wuhan Univiersity of Technology, Wuhan, Hubei 430070, People's Republic of China.
authors.forename: M L
authors.initials: ML
authors.lastname: Qi
authors.affiliation: Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, People's Republic of China.
authors.forename: M H
authors.initials: MH
authors.lastname: Zhu
authors.affiliation: The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China.|Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, People's Republic of China.
authors.forename: S N
authors.initials: SN
authors.lastname: Luo