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首页> 外文期刊>Contributions to Mineralogy and Petrology >Microstructural evolution and grain boundary structure during static recrystallization in synthetic polycrystals of Sodium Chloride containing saturated brine
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Microstructural evolution and grain boundary structure during static recrystallization in synthetic polycrystals of Sodium Chloride containing saturated brine

机译：含饱和盐水的氯化钠合成多晶体静态再结晶过程中的微观组织演变和晶界结构

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摘要

The effects of brine on recrystallization in halite are well known. However, properties of brine such as morphology, connectivity, diffusivity and the resulting influences on deformation mechanisms are still a matter of debate. This paper presents a microstructural study of dense, statically recrystallizing synthetic polycrystalline halite containing small amounts of brine. We used powders of two different grain size classes: < 10 mu m and 200-355 mu m. The aggregates were compacted to brine-filled porosities less than about 2 percent and annealed at room temperature, without an external stress field. Coarse-grained samples undergo recrystallization manifested by the growth of large (up to 300 mu m) strain-free grains into the deformed old grains. The new grains are frequently euhedral, with mobile grain boundaries moving at rates up to 6 nm/s. Their mobility is interpreted to be high due to the presence of water. Grain surfaces are smooth and the width of the water-rich zones is usually below the resolution of the SEM (less than 50 nm). The evolution of fine-grained samples starts with primary recrystallization and a reorganization of grain boundaries. After this stage, which lasts a few hours, normal grain growth effectively stops, and no significant increase of grain size is observed even after several months. Microstructural observations indicate contact healing at the grain boundaries, with dihedral angles ranging between 20 and 110 deg. We interpret these boundaries to be fluid-free, with the brine residing in a network of triple junction tubes. This system of triple junctions is interconnected and associated with significant permeability. While grain growth is inhibited in the fine-grained samples, after a few hours of annealing exaggerated grain growth is commonly initiated. This is manifested by the growth of large, euhedral grains replacing the fine-grained matrix. These grains also grow with low-index facets and their boundaries are also interpreted to be mobile due to the existence of a water-rich phase.
机译：盐水对盐岩中重结晶的影响是众所周知的。但是，盐水的形态，连通性，扩散性以及对变形机理的影响等仍是一个有争议的问题。本文介绍了含有少量盐水的致密，静态重结晶的合成多晶盐的微观结构研究。我们使用了两种不同粒度等级的粉末：<10微米和200-355微米。将骨料压实至填充盐水的孔隙率小于约2％，并在室温下退火，而没有外部应力场。粗晶粒样品会发生重结晶，这表现为大的（高达300微米）无应变晶粒长到变形的旧晶粒中。新晶粒通常是平整的，可移动的晶粒边界以高达6 nm / s的速率移动。由于水的存在，它们的流动性很高。谷物表面光滑，富水区的宽度通常低于SEM的分辨率（小于50 nm）。细粒样品的演化始于初次重结晶和晶界的重新组织。在持续了几个小时的此阶段之后，正常的晶粒生长实际上停止了，即使几个月后也未观察到晶粒尺寸的显着增加。显微组织观察表明在晶界处的接触愈合，二面角在20至110度之间。我们将这些边界解释为无流体，盐水位于三结管网络中。该三重结系统相互连接并具有显着的渗透性。尽管细粒样品中的晶粒长大受到抑制，但退火几小时后，通常会开始夸大晶粒长大。这由大的，全金属的晶粒的生长代替了细颗粒的基质来体现。这些晶粒也以低折射率的小面生长，并且由于存在富水相，它们的边界也被解释为可移动的。

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