Experimental study on characteristics of shock-induced phase transition and spallation in FeMnNi alloy

Light gas gun plate impact experiments were conducted on a FeMnNi alloy and phase transition and spallation occurred. Transition pressure of this alloy obtained in the experiments (6.3~6.9 GPa) is much lower than that of pure iron (13 GPa), which demonstrats that the addition of Mn and Ni may lower the transition pressure strongly. Observation of the recovered samples shows that multiple spallations and shallow spallation may occur in the sample when the pressure is higher than the transition pressure of this alloy. Experimental results indicate that the spallation strength of this alloy doesnt increase distintly after phase transition.