Abstract
Combined application of thermal and pressure are effective to obtain structure excited metallic glass with high energy state. This work studied the thermal-pressure effects on energy state, atomic level structure and tensile behavior during each separate fabrication stage (heating, equilibrating, and quenching) of Cu50Zr50 metallic glasses by dynamic simulation. It is found that quenching under pressure is the most effective approach obtaining high energy state Cu50Zr50 metallic glass among 4 designed methods. For the effective approach, the potential energy increases and the atomic volume decreases with pressure for Cu50Zr50 metallic glass when the pressure is below 30 GPa, and the latter reaches its minimum at 30 GPa. Moreover, Cu-centered full icosahedron <0, 0, 12, 0> plays a dominant role in the formation of high energy structure, and Cu50Zr50 metallic glass fabricated by method 3 under 30 GPa shows the most improved plasticity.
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