Ultrafast dynamic compression technique to study the kinetics of phase transformations in bismuth |
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Authors: | Smith R F Eggert J H Saculla M D Jankowski A F Bastea M Hicks D G Collins G W |
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Institution: | Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA. |
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Abstract: | 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, epsilonover ]>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 epsilonover ] is consistent with a thermally activated transformation. |
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