Abstract
Phase transition behavior of FeMnNi alloy with α‐ε phase transition threshold in range of 6 GPa–7 GPa and corresponding spall phenomena in symmetric impact were studied experimentally. Impact of z‐cut sapphire flyer on specimen with z‐cut sapphire window and reverse impact by using specimen driven as flyer on z‐cut sapphire and LiF window were used for loading and release wave profile measurement by VISAR. Experiments were conducted in velocity range 500 m/s–2000 m/s. Pulse X‐ray was used for spallation verification by reason of difficulty in specimen recovery. Spallation phenomena were observed as impact stress far exceeds α‐ε transition threshold. Observed spall phenomena should be related to special release wave configuration formed during reverse phase transition when impact stress slight exceeds phase transition threshold and even typical rarefaction shock wave formation is not observed.
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