Li Li, Weidner Donald J
Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794-2100, USA.
Rev Sci Instrum. 2015 Dec;86(12):125106. doi: 10.1063/1.4937398.
Here, we present a new experimental protocol to investigate the relationship between texture, plastic strain, and the mechanisms of plastic deformation at high pressure and temperature. The method utilizes synchrotron X-ray radiation as the probing tool, coupled with a large-volume high pressure deformation device (D-DIA). The intensity of X-ray diffraction peaks within the spectrum of the sample is used for sampling texture development in situ. The unique feature of this study is given by the sinusoidal variation of the intensity when a sinusoidal strain is applied to the sample. For a sample of magnesium oxide at elevated pressure and temperature, we demonstrate observations that are consistent with elasto-plastic models for texture development and for diffraction-peak measurements of apparent stress. The sinusoidal strain magnitude was 3%.
在此，我们提出一种新的实验方案，以研究在高压和高温下织构、塑性应变及塑性变形机制之间的关系。该方法利用同步加速器X射线辐射作为探测工具，并结合大体积高压变形装置（D-DIA）。通过样品光谱内X射线衍射峰的强度来原位采样织构发展情况。当对样品施加正弦应变时，强度的正弦变化赋予了本研究的独特之处。对于氧化镁样品在升高的压力和温度下，我们展示了与织构发展的弹塑性模型以及表观应力的衍射峰测量结果相一致的观测结果。正弦应变幅度为3%。
