Deformation of ice on the grain scale by means of high-resolution crystal-orientation measurements using X-ray Laue and Electron backscatter diffraction

最近对南极冰样品颗粒尺度上的变形微观结构的观察揭示了一些发现，这些发现有望缩小我们关于控制冰盖流动过程的知识空白。继续研究这些发现可以为一般的限速过程提供重要的见解，特别是对于非基底位错是否起重要作用的问题。利用x射线劳厄衍射和电子背散射衍射（EBSD）进行的高分辨率全晶体取向测量，结合微观结构测绘（µSM），提供了识别不同亚晶界和位错类型的信息。µSM和劳厄衍射成功地应用于冰，而EBSD虽然在其他材料科学中是一种成熟的方法，但仍然很少用于冰。然而，EBSD将为多晶冰的变形过程提供重要的新发现。这些知识有助于改进冰的流动规律的参数和指数的定义。

Recent observations on deformation microstructures on the grain scale of Antarctic ice samples reveal findings, which promise constriction of a gap in our knowledge concerning the processes controlling the flow of ice sheets. Continuation to pursue these findings can give important insight into rate-limiting processes in general and especially into the question, whether non-basal dislocations play a significant role. High-resolution full crystal-orientation measurements conducted with X-ray Laue diffraction and Electron backscattered diffraction (EBSD) in combination with microstructure mapping (µSM) provide information to identify the different subgrain boundary- and dislocation types. µSM and Laue diffraction are successfully applied on ice, whereas EBSD, although a well-established method in other materials sciences, is still rarely used for ice. However, EBSD will offer important new findings for deformation processes in polycrystalline ice. This knowledge can contribute to an improved definition of parameters and exponent for the flow law of ice.