Quantifying geometrically necessary dislocations in quartz using HR-EBSD: Application to chessboard subgrain boundaries
Quantifying geometrically necessary dislocations in quartz using HR-EBSD: Application to chessboard subgrain boundaries
复制标题
使用 HR-EBSD 量化石英中几何必要位错：在棋盘亚晶界的应用
DOI：
10.1016/j.jsg.2017.12.012
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发表时间：
2017
影响因子：
3.1
通讯作者：
L. Hansen
中科院分区：
文献类型：
--
作者：
D. Wallis;A. Parsons;L. Hansen
本研究首次利用高角分辨电子背散射衍射(HR-EBSD)定量表征了石英亚晶结构中的几何必需位错。HR-EBSD利用衍射图的互相关来测量晶内取向错误，其精度在0.01°量级，并且错误取向轴受到很好的约束。我们研究了尼泊尔大喜马拉雅序列样品中石英中棋盘状亚晶的位错结构。结果表明，棋盘亚晶主要由两组亚晶界形成。一组主要由{m}[c]刃位错组成，另一组主要由具有<a>Burgers矢量的位错组成。几何必要位错的表观密度从某些亚晶界内的>；1013m−2到亚晶内部的<；1012m−2不等。结果表明，当压力高于约10kbar时，在α-石英稳定区内可能形成棋盘状亚颗粒。最重要的是，这项研究证明了HR-EBSD作为分析石英颗粒内微结构的一种改进方法的潜力，这些微结构被用作变形条件的指示器。
This study presents the first use of high-angular resolution electron backscatter diffraction (HR-EBSD) to quantitatively characterise geometrically necessary dislocations in quartz subgrain structures. HR-EBSD exploits cross-correlation of diffraction patterns to measure intragranular misorientations with precision on the order of 0.01° with well-constrained misorientation axes. We investigate the dislocation structures of chessboard subgrains in quartz within samples from the Greater Himalayan Sequence, Nepal. Our results demonstrate that chessboard subgrains are formed primarily from two sets of subgrain boundaries. One set consists primarily of {m}[c] edge dislocations, the other consists primarily of dislocations with <a> Burgers vectors. Apparent densities of geometrically necessary dislocations vary from > 1013m−2within some subgrain boundaries to < 1012m−2within subgrain interiors. The results suggest that at pressures above approximately 10 kbar, chessboard subgrains may form within the α-quartz stability field. Most importantly, this study demonstrates the potential of HR-EBSD as an improved method for analysis of intragranular microstructures in quartz that are used as indicators of deformation conditions.
影响因子：
5.3
作者：
Y. Boneh;D. Wallis;L. Hansen;M. Krawczynski;P. Skemer
通讯作者：
Y. Boneh;D. Wallis;L. Hansen;M. Krawczynski;P. Skemer
影响因子：
13.6
作者：
Kumamoto KM;Thom CA;Wallis D;Hansen LN;Armstrong DEJ;Warren JM;Goldsby DL;Wilkinson AJ
通讯作者：
Wilkinson AJ
影响因子：
2.2
作者：
Britton, T. B.;Wilkinson, A. J.
通讯作者：
Wilkinson, A. J.