Abstract
The effect of Mn element on shock response of CoCrFeNiMnx high entropy alloys(HEAs)are investigated using molecular dynamics simulations.Structural analysis shows that Mn-rich CoCrFeNiMnx HEA has a larger average atomic volume.The elastic properties of CoCrFeNiMnx HEAs under various hydrostatic pressures are studied,revealing that the elastic modulus decreases with increasing of Mn content.The shock thermodynamic parameters are quantitatively ana-lyzed.The Mn-dependent shock Hugoniot relationship of CoCrFeNiMnx HEAs is obtained:Us=1.25+(5.21-0.011 x)Up.At relatively high shock pressure,the increase in Mn content promotes the formation of clustered BCC structures and hin-ders the development of dislocations.In addition,more FCC structures in Mn-rich CoCrFeNiMnx HEAs transform into disordered structures during spallation.Spall strength decreases with increasing Mn content.This study can provide a reference for the design and application of CoCrFeNiMn HEAs under shock loading.
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