High pressure influence on the kinetics of solidification of the supercooled melts Pb(In)

Abstract

The measurements of supercooling AT and average grain size d of quenched f.c.c. solid solutions Pb_1-x In_x (x=0.1, 0.2, 0.5) under normal and high (2.5 and 5.0 GPa) pressure and constant cooling rate 500 K/s were performed.

Using the classical theory of nucleation and crystal growth the numerical evaluation of surface tension σ between a nucleus and a melt and activation energy ΔG was made of a crystal growth under different pressures. Different models for a description of pressure dependences σ(P), ΔG(P) and concentration dependences ΔT(x), d(x), §(x), AG(x) under different pressures are discussed.

Key Words:

• Kinetics of solidification
• solid solutions
• high pressure
• supercooling
• grain size.