Ultrafast dynamic compression technique to study the kinetics of phase transformations in bismuth.
Preheated Bi (296-532 K) was ramp compressed with 15-35 ns rise times to a peak stress of approximately 11 GPa to explore structural phase-transformation kinetics under dynamic loading conditions. At high strain rates, epsilon[over ]>5 x 10;{6} s;{-1}, deviation from equilibrium phase boundaries suggests that compression time scales are comparable to the new phase incubation period. The dependence of DeltaP/kT on epsilon[over ] is consistent with a thermally activated transformation.
Smith
R F
RF
Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA.
Eggert
J H
JH
Saculla
M D
MD
Jankowski
A F
AF
Bastea
M
M
Hicks
D G
DG
Collins
G W
GW