Dislocation structure of deformed olivine single crystals from conventional EBSD maps
Dislocation structure of deformed olivine single crystals from conventional EBSD maps
复制标题
传统 EBSD 图上变形橄榄石单晶的位错结构
DOI：
10.1007/s00269-021-01157-3
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发表时间：
2021
影响因子：
1.4
通讯作者：
Faul, Ulrich
中科院分区：
文献类型：
--
作者：
Faul, Ulrich
位错是以滑移系为特征的晶格中的线性缺陷，可以提供晶粒内部变形的记录。由于观测方法的固有局限性，对这一记录的全面研究受到了限制。透射电子显微镜显示个别位错，但图像只有几个平方米的样品。氧化修饰需要复杂的样品制备，并且在检测所有位错及其类型时具有不确定性。映射位错密度和滑移系统的可能性，由传统的（Hough变换为基础）EBSD研究在这里与自然和实验变形圣卡洛斯橄榄石单晶。几何形状和位错结构的晶体变形的取向，旨在激活特定的滑移系，以前分析了TEM和氧化装饰。曲率张量是从晶格的取向变化计算的，其被反转以用Matlab的MTEX计算几何上必要的位错的密度。个别位错类型的密度沿着与取向差轴进行比较，在变形的晶体上测量的取向变化。在滤波（去噪）之后，噪声基底和计算的位错密度与从高分辨率EBSD映射报告的那些相当。对于[110]c和[011]c方向变形的样品，EBSD映射分别确认[100]（010）和[001]（010）为主导滑移系。因此，EBSD映射使得能够相对有效地观察与晶内变形相关的位错结构，其分布在子边界处，并且在比先前可能的大得多的区域上局部化。这将使自然和实验变形多晶体中的位错结构的映射成为可能，并可能对地球上地幔的变形过程产生新的见解。
Dislocations, linear defects in a crystalline lattice characterized by their slip systems, can provide a record of grain internal deformation. Comprehensive examination of this record has been limited by intrinsic limitations of the observational methods. Transmission electron microscopy reveals individual dislocations, but images only a few squarem of sample. Oxidative decoration requires involved sample preparation and has uncertainties in detection of all dislocations and their types. The possibility of mapping dislocation density and slip systems by conventional (Hough-transform based) EBSD is investigated here with naturally and experimentally deformed San Carlos olivine single crystals. Geometry and dislocation structures of crystals deformed in orientations designed to activate particular slip systems were previously analyzed by TEM and oxidative decoration. A curvature tensor is calculated from changes in orientation of the crystal lattice, which is inverted to calculate density of geometrically necessary dislocations with the Matlab Toolbox MTEX. Densities of individual dislocation types along with misorientation axes are compared to orientation change measured on the deformed crystals. After filtering (denoising), noise floor and calculated dislocation densities are comparable to those reported from high resolution EBSD mapping. For samples deformed in [110]c and [011]c orientations EBSD mapping confirms [100](010) and [001](010), respectively, as the dominant slip systems. EBSD mapping thus enables relatively efficient observation of dislocation structures associated with intracrystalline deformation, both distributed, and localized at sub-boundaries, over substantially larger areas than has previously been possible. This will enable mapping of dislocation structures in both naturally and experimentally deformed polycrystals, with potentially new insights into deformation processes in Earth’s upper mantle.
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影响因子：
2
作者：
Prior, DJ
通讯作者：
Prior, DJ
变形橄榄石恢复过程与上地幔力学状态的实验研究
DOI：
--
发表时间：
1978
期刊：
影响因子：
--
作者：
M. Toriumi;S. Karato
通讯作者：
S. Karato
DOI：
--
发表时间：
1982
期刊：
影响因子：
--
作者：
P. Gueguen;M. Darot
通讯作者：
M. Darot
影响因子：
--
作者：
M. Darot;Y. Guéguen
通讯作者：
Y. Guéguen
影响因子：
56.9
作者：
KOHLSTEDT, DL;GOETZE, C;VANDERSANDE, J
通讯作者：
VANDERSANDE, J