中文摘要：

对FeMnNi合金进行了轻气炮平板撞击实验研究,实验中材料发生了相变和层裂.得到的FeMnNi合金的相变阈值压力为6.3～6.9 GPa,远低于纯铁的相变阈值压力13 GPa,说明Mn、Ni合金元素的加入会极大的降低相变阈值.回收试样观测表明,当应力高于FeMnNi合金的相变阈值时,样品中可能产生二次层裂现象和浅表层裂新现象.实验结果还表明该合金相变后层裂强度没有明显的提高.

英文摘要：

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 doesn＇t increase distintly after phase transition.