Microstructure Effects on Mechanical Properties of FeNiCrCoCu Nanoporous High-Entropy Alloy with Bicontinuous Characteristics
ZH Su and YH Zhang, JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2022).
In this work, a series of atomic simulations are performed to pinpoint the effects of microstructure on the mechanical properties of FeNiCrCoCu nanoporous high-entropy alloy (NP-HEA). Such numerical simulations corroborate that the most paramount parameter determining the mechanical properties is the relative density. The stiffness and strength of NP-HEA have a positive relationship with the relative density. However, the specific surface area has a negligible effect on the mechanical properties. Scaling laws between mechanical properties and relative density are investigated. It is found that the elastic modulus has a quadratic relationship with the relative density, which suggests the principal deformation mechanism in the elastic domain is the bending of ligaments. The quadratic relationship is also observed between ultimate strength and relative density. Dislocation propagation and the formation of stacking fault are the major plastic events of NP-HEA under uniaxial tensile loading. In addition, the effects of temperature, fraction of elements, and deformation rate on the tensile behaviors are presented.
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