Mechanical Properties and Energy Absorption Characteristics of Porous CoCrNi Medium-Entropy Alloy
The porous CoCrNi medium-entropy alloys with porosity of 63％-78％and pore size of 1.3-2.2 mm were prepared by powder sintering and dissolution method.The pore morphology and phase constitute of the samples were analyzed by SEM and XRD,and the axial quasi-static compression experiments were conducted on the samples.The results show that the elastic modulus and yield platform stress of porous CoCrNi alloy decrease with the increase in porosity and pore size.Compared with porosity,the effect of pore size on mechanical properties is low.The energy absorption value per unit volume in porous CoCrNi medium-entropy alloys with different porosities ranges from 34.81 MJ/m3 to 14.25 MJ/m3 under dense strain,which is about 3.8 times larger than that of aluminum foam,and the ideal energy absorption efficiency(Ⅰ)of the alloys with five kinds of porosities is close to 0.8,indicating that the porous CoCrNi medium-entropy alloy has the potential to become an ideal energy absorption material.
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