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

使用 X 射线劳厄和电子背散射衍射进行高分辨率晶体取向测量，测量晶粒尺度上的冰变形

• 批准号: 75773225
• 负责人: Professorin Dr. Ilka Weikusat
• 金额: --
• 依托单位: Arbeitsgruppe Strukturgeologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/75773225?language=en
• 关键词: Deformation; ice; grain; scale; means

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.

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的过程的知识中的空白。继续追求这些发现可以提供重要的洞察限速过程一般，特别是到的问题，是否非基底位错发挥重要作用。利用X射线劳厄衍射和电子背散射衍射（EBSD）结合显微结构测绘（µSM）进行的高分辨率全晶体取向测量提供了识别不同亚晶界和位错类型的信息。µSM和劳厄衍射已成功应用于冰，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流动规律的参数和指数的定义。

项目成果

Competition between grain growth and grain-size reduction in polar ice

极地冰晶粒长大和晶粒尺寸减小之间的竞争

• DOI: 10.3189/002214311798043690
• 发表时间: 2011
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: Rössiger;Griera;Jessell;Montagnat;Kipfstuhl;S. H. ;Weikusat
• 通讯作者: Weikusat

Subgrain boundaries and related microstructural features in EDML (Antarctica) deep ice core

EDML（南极洲）深冰芯中的亚晶界和相关微观结构特征

• DOI: 10.3189/002214309788816614
• 发表时间: 2009
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: Weikusat;Kipfstuhl;Miyamoto
• 通讯作者: Miyamoto

Cryogenic EBSD on ice: preserving a stable surface in a low pressure SEM

• DOI: 10.1111/j.1365-2818.2010.03471.x
• 发表时间: 2011-06
• 期刊: Journal of Microscopy
• 影响因子: 2
• 作者: I. Weikusat;D. D. Winter-D.;G. Pennock;M. Hayles;C. Schneijdenberg;M. Drury

Subgrain boundaries in Antarctic ice quantified by X-ray Laue diffraction

• DOI: 10.3189/002214311795306628
• 发表时间: 2011-03
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: I. Weikusat;A. Miyamoto;S. H. Faria;S. Kipfstuhl;N. Azuma;T. Hondoh

Complete determination of ice crystal orientation using Laue X-ray diffraction method

使用劳厄 X 射线衍射法完全测定冰晶方向

• DOI: 10.3189/002214311795306754
• 发表时间: 2011
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: Miyamoto;Weikusat;Hondoh
• 通讯作者: Hondoh