Phase transformation rate in shock-loaded KCL

Ding, Jow-Lian; Hayes, Dennis
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p633
Academic Journal
Previous experimental data on shocked single crystal KC1, between 20 and 40 kbar, displayed the B1 → B2 phase transformation. Stress histories at the impact surface provided information on phase change kinetics: very rapid transformation to a non-equilibrium, metastable state followed by a slower transformation to the equilibrium state. In the current study, we analyzed the transmitted wave profiles, which yielded additional insight on the phase transformation kinetics of KC1. Our analyses do not conclusively determine these rates as different methods of analysis give different estimates. It is clear, however, that the transformation rate for [100] crystals was larger than estimated previously. The study also demonstrates that strength effects may play an important role on both the P2 arrival time and on the transient drop in stress observed behind the P1 wave as measured at the rear quartz gauge, and that transformation rate effects may be confounded with strength effects in these experiments behind P1 wave.


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