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This paper provides an investigation of the phase
transition and spalling characteristic induced during shock loading
and unloading in the pure iron and the FeMnNi alloy. The impact for
the pure iron is symmetric and with same-thickness for both the
flyer and the target plate. It is found that an abnormal multiple
spalling happens in the pure iron sample as the pressure exceeds the
$\alpha -\varepsilon $ transition threshold of 13 GPa. In the
symmetric and same-thickness impact and reverse impact experiments
of the FeMnNi alloy, two abnormal tension regions occur when the
pressure exceeds the $\alpha -\varepsilon $ transition threshold of
6.3~GPa, and the reverse phase transition $\varepsilon -\alpha $
begins below 4.2~GP. The experimental process is simulated
successfully from the non-equilibrium mixture phase and Boettger's
model. Such abnormal spalling phenomena are believed to relate to
the shocked $\alpha -\varepsilon $ phase transition. The possible
reasons for the abnormal multiple spalling, which occurs during the
symmetric and same-thickness impact experiments of pure iron and
FeMnNi alloy, are discussed. 相似文献
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