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通过纳米压痕、微压痕和微划痕试验,研究了单晶MgO不同晶面的的纳米力学性能以及微观变形和损伤特征。根据加载条件的不同,单晶MgO会发生:弹性变形、弹塑性变形、蠕变变形、微裂纹和微破碎。弹性变形时的纳米压痕力-位移曲线符合赫兹弹性接触理论,其变形在卸载后可完全恢复;塑性变形时MgO在{110}易滑移晶面系内位错形核和滑移的结果。
The nano-mechanical properties, microscopic deformation and damage characteristics of different single crystal MgO crystal planes were studied by nano-indentation, microindentation and micro-scratch test. Depending on the loading conditions, single crystal MgO can occur: elastic deformation, elastic-plastic deformation, creep deformation, micro-cracks and micro-cracks. The nanoindentation force-displacement curve of elastic deformation is in accordance with Hertz’s elastic contact theory, and its deformation can be restored completely after unloading. The results of dislocation nucleation and slippage of MgO in the {110} slipping surface system during plastic deformation .