The uniaxial stretching process of single-crystal magnesium containing voids was simulated by molecular dynamics and embedded atom method

and the influence of tensile crystal orientation and void shape on the growth and deformation of voids was investigated.The results show that the microscopic mechanism of the void growth and deformation of single crystal magnesium is different when the crystal orientation is stretched.Stretching along the■crystal direction

cracks perpendicular to the stretching direction appear inside the crystal.As the loading progresses

the cracks and voids coalesce and the voids grow eventually lead to material failure

while stretching along the[0001]crystal direction

dislocations nucleation occurs on the surface of the cavity and stacking faults appear.As the loading progresses

the stacking faults become the nucleation point of twins.The twins begin to grow up and gradually occupy the entire crystal and eventually lead to material failure.Different cavity shapes have little effect on the Young’s modulus of the material

however it will has a certain effect on the yield strength of the single crystal Mg.Stretching along the■crystal direction

it is taken easier for the crystals containing spherical voids to produce perpendicular to the stretching at the middle position.Directional cracks

cracks and cavities coalesce can result in the material failure

so when stretched along the■crystal direction

the yield strength of the material with spherical cavities is the smallest.