TY - JOUR
T1 - Effects of defects and microstructure on release melting of shock-loaded copper
T2 - Atomistic simulations
AU - He, An Min
AU - Wang, Pei
AU - Shao, Jian Li
N1 - Publisher Copyright:
© 2018 Author(s).
PY - 2018/1/7
Y1 - 2018/1/7
N2 - This work is dedicated to study the effects of defects and microstructures on release melting of shock-loaded copper, based on large-scale molecular dynamics simulations. Three types of specimens are established including a single crystal with a nanovoid, a bicrystal with a twist grain boundary, and an idealized hexagonal columnar nanocrystal. The microscopic dynamics and the thermodynamic properties of these samples during shock unloading are investigated. It is revealed that preexistent defects in single crystals and anisotropic responses of constituent grains in nanocrystals, which can induce local release melting prior to homogeneous melting of defect-free regions, have noticeable influences on the release melting process. Moreover, distinct from the non-equilibrium release melting of perfect single crystals, local release melting in these systems takes place when the release path passes through the thermodynamic melting curve, demonstrating an equilibrium process.
AB - This work is dedicated to study the effects of defects and microstructures on release melting of shock-loaded copper, based on large-scale molecular dynamics simulations. Three types of specimens are established including a single crystal with a nanovoid, a bicrystal with a twist grain boundary, and an idealized hexagonal columnar nanocrystal. The microscopic dynamics and the thermodynamic properties of these samples during shock unloading are investigated. It is revealed that preexistent defects in single crystals and anisotropic responses of constituent grains in nanocrystals, which can induce local release melting prior to homogeneous melting of defect-free regions, have noticeable influences on the release melting process. Moreover, distinct from the non-equilibrium release melting of perfect single crystals, local release melting in these systems takes place when the release path passes through the thermodynamic melting curve, demonstrating an equilibrium process.
UR - http://www.scopus.com/inward/record.url?scp=85040175914&partnerID=8YFLogxK
U2 - 10.1063/1.5005000
DO - 10.1063/1.5005000
M3 - Article
AN - SCOPUS:85040175914
SN - 0021-8979
VL - 123
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 1
M1 - 015901
ER -