Abstract
Abstract Sapphire crystal is irradiated by neutron flux with the fluence of 1.0×10 18 n/cm 2 and 1.0×10 19 n/cm 2 . The influence of neutron irradiation on the mechanical properties of sapphire is investigated in this paper. The crystal structure of sapphire is investigated by double-crystal X-ray diffraction (DXRD) and transmission electron microscopy (TEM). Compared with the pristine sapphire, the elastic modulus is decreased and the Vickers hardness, fracture toughness and biaxial flexure strength are increased in the neutron irradiated sample. The elastic modulus, Vickers hardness, fracture toughness and biaxial flexural strength of the 1.0×10 19 n/cm 2 neutron irradiated sapphire are 497.11 GPa (at room temperature), 18.8 GPa, 2.95 MPa m 1/2 and 604 MPa (600 °C), respectively.
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