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首页> 外文会议>Nanomechanical testing in materials research and development V >USING IN-SITU MICROLAUE DIFFRACTION TO UNDERSTAND PLASTICITY IN MgO
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USING IN-SITU MICROLAUE DIFFRACTION TO UNDERSTAND PLASTICITY IN MgO

机译：使用原位微衍射来了解MgO中的可塑性

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The present study investigates the micromechanical modes of deformation in MgO prior to cracking at room temperature. A combination of time resolved white beam Laue diffraction technique and in-situ nano-indentation of large single crystal micropillars provides a unique method to study the operating mechanisms of deformation in this otherwise brittle oxide ceramic. Upon indenting an [100]-oriented MgO micropillar, rotation and streaking of Laue spots were observed. From the streaking of the Laue spots, differential slip on orthogonal {110} slip planes was inferred to take place in adjacent areas under the indent - this was consistent with the results from the transmission electron microscopy studies. Upon cyclic loading of the pillar, subsequent stretching and relaxation of peaks was hypothesised to happen due to pronounced mechanical hysteresis commonly observed in MgO. Also, time-resolved spatial mapping of the deformation gradients of the area under the indent were obtained from which the strain and rotation components were identified.
机译：本研究研究了在室温下开裂之前MgO变形的微观力学模式。时间分辨白光束Laue衍射技术与大单晶微柱的原位纳米压痕相结合，提供了一种独特的方法来研究这种脆性氧化物陶瓷的变形作用机理。压入[100]取向的MgO微柱后，观察到劳厄点的旋转和条纹。从劳埃斑的条纹，可以推断出在凹痕下方的相邻区域中发生了正交{110}滑移面上的差异滑移，这与透射电子显微镜研究的结果一致。假设在柱子承受周期性载荷后，由于在MgO中通常会观察到明显的机械滞后，因此发生了峰的拉伸和松弛。此外，获得了凹痕下方区域的变形梯度的时间分辨空间映射，从而确定了应变和旋转分量。

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