Effect of pore shape and porosity on the elastic and fracture properties of nanoporous Mg and Mg17Al12

WJ Zhu and JG Du and G Jiang, COMPUTATIONAL MATERIALS SCIENCE, 197, 110666 (2021).

DOI: 10.1016/j.commatsci.2021.110666

Magnesium-Aluminum (Mg-Al) alloy is the lightest and most widely used metal material in engineering. In this work, nanoporous Mg and Mg17Al12 with different pore shape (spherical and cylindrical pores) and porosity (10%, 20%, 30% and 40%) were constructed. The effects of pore shape and porosity on their elastic and fracture properties were studied by molecular dynamics simulations. The results show that the elastic constants and moduli decrease with increasing porosity, and pore shape has little influence on the values. Uniaxial tensile simulations were performed to study the tensile and fracture behaviors of nanoporous structures. Structures of nanoporous Mg17Al12 show brittleness and have higher tensile strengths than that of Mg. The tensile strengths of structures with cylindrical pores are higher than that of structures with spherical pores at the same porosity when the tensile direction is parallel to the cylindrical pore. Vacancies were noted in all the structures during the uniaxial tensile process, while fracture is mainly noted in nanoporous Mg17Al12.

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