The effect of static annealing on microstructures and crystallographic preferred orientations of quartzites experimentally deformed in axial compression and shear
The effect of static annealing on microstructures and crystallographic preferred orientations of quartzites experimentally deformed in axial compression and shear
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DOI：
10.1144/gsl.sp.2001.200.01.12
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
R. Heilbronner;J. Tullis
中科院分区：
文献类型：
--
作者：
R. Heilbronner;J. Tullis
摘要：石英岩样品在三种位错蠕变状态下通过轴向压缩（应变大小为 0.8 至 1.4）和一般剪切（应变大小为 1.3 至 2.8）进行部分至完全动态再结晶实验变形，随后在变形温度下进行完全静态再结晶退火 120 小时。在退火前后测量c轴晶体择优取向(CPO)、3D晶粒尺寸分布、晶界表面形状和取向差密度。退火对CPO的影响较小，但显微组织发生了很大变化。所有退火样品均完全再结晶。再结晶晶粒尺寸增加了 2 至 5 倍，并且在最低温度下变形的样品最大。晶界叶状度（PARIS因子）和取向差密度显着降低。所有变形样品的 CPO 在退火后相对没有变化，尽管强度有所下降；对于剪切样品，不对称性得以保留。结果提出了用于识别静态退火发生和估计与退火样品的古显微法相关的动态再结晶晶粒尺寸的显微结构标准。
Abstract Quartzite samples were experimentally deformed with partial to complete dynamic recrystallization by axial compression (strain magnitude of 0.8 to 1.4) and by general shear (strain magnitude of 1.3 to 2.8) in each of the three dislocation creep regimes, and subsequently annealed with complete static recrystallization at the deformation temperature for 120 hours. The c-axis crystallographic preferred orientation (CPO), 3D grain size distribution, grain boundary surface shape, and misorientation density were measured before and after annealing. The effect of annealing on the CPO was minor, but the microstructure was greatly changed. All of the annealed samples were completely recrystallized. The recrystallized grain size increased by a factor of 2 to 5, and was greatest for samples deformed at lowest temperature. The grain boundary lobateness (PARIS factor) and misorientation density were reduced significantly. The CPOs for all the deformed samples were relatively unchanged by annealing, although the strengths are somewhat decreased; for sheared samples the asymmetry was preserved. The results suggest microstructural criteria for recognizing the occurrence of static annealing and for estimating the dynamically recrystallized grain size relevant for paleopiezometry from annealed samples.