Molecular Dynamics Study on the Deformation Mechanism and Mechanical Properties of YSZ Nanopillars under Uniaxial Tension
The deformation mechanism of single crystal yttrium stabilized tetragonal zirconia(YSZ)nanorods under uniaxial tension was studied by the molecular dynamics method.The simulation results show that the nano-plastic deformation of YSZ strongly depends on the crystal orientation of zirconia nanorods.The[001]crystal oriented YSZ nanorods can observe the phase transition from tetragonal phase to monoclinic phase under tensile load.At low strain rates,the low strain rate does not affect the mechanical properties of YSZ nanopillars,including Young's modulus,strength and yield strain,and the main deformation mechanism.In addition,the YSZ nanopillars with a tetragonal to monoclinic phase transition exhibited a strong size effect on their mechanical properties,with the strength of YSZ decreasing as the nanocolumn size decreased.
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