Structural evolution of nanoscale metallic glasses during high-pressure torsion: A molecular dynamics analysis.
Structural evolution in nanoscale Cu50Zr50metallic glasses during high-pressure torsion is investigated using molecular dynamics simulations. Results show that the strong cooperation of shear transformations can be realized by high-pressure torsion in nanoscale Cu50Zr50metallic glasses at room temperature. It is further shown that high-pressure torsion could prompt atoms to possess lower five-fold symmetries and higher potential energies, making them more likely to participate in shear transformations. Meanwhile, a higher torsion period leads to a greater degree of forced cooperative flow. And the pronounced forced cooperative flow at room temperature under high-pressure torsion permits the study of the shear transformation, its activation and characteristics, and its relationship to the deformations behaviors. This research not only provides an important platform for probing the atomic-level understanding of the fundamental mechanisms of high-pressure torsion in metallic glasses, but also leads to higher stresses and homogeneous flow near lower temperatures which is impossible previously.
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.
S D
SD
Feng
Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
W
W
Jiao
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.
Q
Q
Jing
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.
L
L
Qi
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China.
S P
SP
Pan
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.|Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee, 37996, USA.
G
G
Li
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.
M Z
MZ
Ma
Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
W H
WH
Wang
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.
R P
RP
Liu