Study on Phase Transition and Spallation of Pure Iron under Given Pressure

By means of VISAR and metallography, phase transition and spalling behavior in pure iron under the given pressure were studied through symmetric and same thickness flyer/sample experiments. In combination with the experimental results from references, and the loading and unloading histories and phase structure in iron sample are obtained. The given pressure is beyond the phase transition pressure of 13 GPa about 2~5 GPa and 10 GPa, respectively. Abnormal multiple spalling behavior happens in the pure iron sample as the impact pressure beyond the phase transition pressure of 13 GPa about 2 GPa. From the interaction process of stress waves, the contacting mechanism among the spalling behavior, the phase transition and the reverse phase transition have been studied.