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The thermodynamic-pathway-determined microstructure evolution of copper under shock compression.
Weidong Ling1, Bo Chen1, Zengxiu Zhao1
1Department of Physics, National University of Defense Technology, Changsha, Hunan 410073, People's Republic of China.
Summary
Shock waves in copper show directional dependence. Simulations reveal that the shock
Area of Science:
- Materials Science
- Condensed Matter Physics
- Shock Physics
Background:
- Shock-induced structural transformations in copper display directional dependence and anisotropy.
- Mechanisms governing material responses to shock based on crystallographic orientation are not fully understood.
Purpose of the Study:
- To investigate shock wave propagation and structural transformation dynamics in monocrystal copper using large-scale simulations.
- To elucidate the role of crystallographic orientation and thermodynamic pathways in shock-induced phase transitions.
Main Methods:
- Large-scale non-equilibrium molecular dynamics (NEMD) simulations.
- Analysis of shock wave propagation and structural evolution in monocrystal copper along different orientations.
Main Results:
- Anisotropic structural evolution is dictated by the thermodynamic pathway.
- Shock along the [100] orientation induces a rapid temperature spike, leading to a solid-solid phase transition.
- Shock along the [111] orientation results in a metastable liquid state due to thermodynamic supercooling, with melting still observed below the supercooling line.
Conclusions:
- The thermodynamic pathway critically determines anisotropic structural evolution under shock.
- Anisotropy, thermodynamic pathways, and solid-state disordering are crucial for interpreting shock-induced phase transitions.
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