HR: 1340h
AN: MR43B-1229    [Abstracts]
TI: High pressure melting of Cu under hydrostatic and shock wave loading
AU: Han, L
AF: University of Science and Technology of China, University of Science and Technology of China, Hefei, Anh 230026, China
AU: An, Q
AF: University of Science and Technology of China, University of Science and Technology of China, Hefei, Anh 230026, China
AU: An, Q
AF: California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, United States
AU: Xie, Y
AF: University of Science and Technology of China, University of Science and Technology of China, Hefei, Anh 230026, China
AU: Zheng, L Q
AF: Florida State University, Florida State University, Tallahassee, FL 32306, United States
AU: Tschauner, O
AF: University of Nevada Las Vegas, 4505 Maryland Parkway, Las Vegas, NV 89154, United States
AU: * Luo, S N
EM: sluo@lanl.gov
AF: Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, NM 10504, United States
AB: We investigate high pressure melting of single crystals of Cu under hydrostatic and shock wave loading using molecular dynamics simulations. The equilibrium metling curve is established via aolid-liquid coexistence and by using the superheating-supercooling hysteresis method, and is found to be in agreement with experiments and independent simulations. Shock wave loading is conducted along 100, 110, and 111, for which different metling behavior is observed: Typical superheating-melting is found for 110 and 111, respectively. A minor degree of premelting is seen for shock loaded crystals oriented along 110. The stress tensor at shock state manifests hydrostaticity above 50 to 70 GPa. These results underline the necessity for cautious interpretation of shock wave loading with respect to phase transitions and material strength.
DE: 0560 Numerical solutions (4255)
DE: 3904 Defects
DE: 3924 High-pressure behavior
DE: 3944 Shock wave experiments
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting