Pressure-Induced Formation of Amorphous Alloys

The high pressure amorphization is studied in this paper, and the influence of pressure was discussed on the nucleation free energy, critical cooling rate during quenching process. Theoretical analyses indicate that the formation of metastable phase (MP) is the prerequisite of that of amorphous phase, and the MP can form only in the system which volume phase transitions expanded during cooling. For these systems, pressure can accelerate nucleation, restrain diffusion, and decrease the critical cooling rate, which results in the formation of MP. There exists a critical pressure, and MP is only formed when pressure is over the critical one. In the end, the MP transforms into amorphous phase as a result of the limitation of dynamic conditions.