TY - JOUR
T1 - A nanoscale study of the negative strain rate dependency of the strength of metallic glasses by molecular dynamics simulations
AU - Yang, Liuqing
AU - Fan, Jitang
AU - Vu-Bac, Nam
AU - Rabczuk, Timon
N1 - Funding Information:
The authors acknowledge the financial support from the Beijing Institute of Technology Research Fund Program for Young Scholars, the Independent Research Project of State Key Laboratory of Explosion Science and Technology with Grant No. QNKT17-03, the Fundamental Research Funds for the Central Universities, the National Natural Science Foundation of China with Grant No. 11602024, and the ‘‘111’’ Project of China with Grant No. G20012017001.
PY - 2018
Y1 - 2018
N2 - Compressive strength and deformation characteristics of a metallic glassy alloy related to strain rate are studied by molecular dynamics simulations. The negative strain rate dependency of strength is presented, i.e., compressive strength decreases with the increase of strain rate, which is well in line with the experimental results. The negative strain rate dependency of strength is explained from two aspects at the atomic scale of free volume and potential energy. Compressive strength is related to the free volume formation in a shear band, which is different from that in a metallic glass matrix. In addition, the relation of potential energy and temperature is also investigated, which indicates that thermal softening also plays an important role in the negative strain rate dependency of strength. The thermal-mechanical coupling mechanisms causing the negative strain rate dependency of the strength of the metallic glassy alloy are clarified. It is significant to explore the intrinsic deformation characteristics of the metallic glassy alloy under a high rate loading.
AB - Compressive strength and deformation characteristics of a metallic glassy alloy related to strain rate are studied by molecular dynamics simulations. The negative strain rate dependency of strength is presented, i.e., compressive strength decreases with the increase of strain rate, which is well in line with the experimental results. The negative strain rate dependency of strength is explained from two aspects at the atomic scale of free volume and potential energy. Compressive strength is related to the free volume formation in a shear band, which is different from that in a metallic glass matrix. In addition, the relation of potential energy and temperature is also investigated, which indicates that thermal softening also plays an important role in the negative strain rate dependency of strength. The thermal-mechanical coupling mechanisms causing the negative strain rate dependency of the strength of the metallic glassy alloy are clarified. It is significant to explore the intrinsic deformation characteristics of the metallic glassy alloy under a high rate loading.
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U2 - 10.1039/c8cp05557b
DO - 10.1039/c8cp05557b
M3 - Article
C2 - 30306983
AN - SCOPUS:85055603889
VL - 20
SP - 26552
EP - 26557
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 41
ER -