Lamellar structures in directionally solidified naphthalene suspensions

IF 2.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Kristen L. Scotti, Peter W. Voorhees, David C. Dunand
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Abstract

To investigate naphthalene as a suspending fluid for freeze-casting applications, sterically stabilized suspensions of copper microparticles suspended in liquid naphthalene are directionally solidified in a Bridgman furnace. Colonies of nearly particle-free naphthalene lamellae, interspersed with particle-enriched interlamellar regions, are predominantly aligned in the direction of the imposed thermal gradient. As furnace translation velocities decrease from 80 to 6.5 μm s−1, the thickness of naphthalene lamellae increases. For the lowest velocity, a transition to a lensing microstructure (with naphthalene bands aligned perpendicular to the solidification direction) is observed in central regions of samples. For all velocities, the naphthalene lamellae show (i) secondary dendritic arms on one of their sides and (ii) are thinnest within core regions relative to peripheral regions (closest to the crucible walls). Together, these observations suggest the presence of buoyancy-driven convection during solidification.

Graphical Abstract

Abstract Image

定向固化萘悬浮液中的层状结构
为了研究萘作为悬浮液在冷冻铸造中的应用,悬浮在液态萘中的铜微颗粒的立体稳定悬浮液在布里奇曼炉中定向凝固。几乎不含颗粒的萘层状菌落与富含颗粒的层间区域相间,主要沿施加的热梯度方向排列。当熔炉平移速度从 80 μm s-1 降低到 6.5 μm s-1 时,萘薄片的厚度增加。在速度最低的情况下,在样品的中心区域观察到向透镜微观结构的过渡(萘带垂直于凝固方向排列)。在所有速度下,萘层状结构(i)在其一侧显示出二级树枝状臂,(ii)相对于外围区域(最靠近坩埚壁),核心区域的萘层状结构最薄。这些观察结果表明,在凝固过程中存在浮力驱动的对流。
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来源期刊
Journal of Materials Research
Journal of Materials Research 工程技术-材料科学:综合
CiteScore
4.50
自引率
3.70%
发文量
362
审稿时长
2.8 months
期刊介绍: Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome. • Novel materials discovery • Electronic, photonic and magnetic materials • Energy Conversion and storage materials • New thermal and structural materials • Soft materials • Biomaterials and related topics • Nanoscale science and technology • Advances in materials characterization methods and techniques • Computational materials science, modeling and theory
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