Insert title here
    登录 | 注册 | 期刊登录 | 收藏
 
 高级组合检索
Acta Materialia 2011, Vol. 59 (12) :4922 -4932 doi:10.1016/j.actamat.2011.04.036 <<-上一篇 下一篇 ->>
Pinch-off of rods by bulk diffusion
Aagesen, L. K.;Johnson, A. E.;Fife, J. L.;Voorhees, P. W.;Miksis, M. J.;Poulsen, S. O.;Lauridsen, E. M.;Marone, F.;Stampanoni, M.
[Aagesen, L. K.; Johnson, A. E.; Fife, J. L.; Voorhees, P. W.] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA.;[Marone, F.; Stampanoni, M.] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.;[Voorhees, P. W.; Miksis, M. J.] Northwestern Univ, Dept Engn Sci & Appl Math, Evanston, IL 60208 USA.;[Poulsen, S. O.; Lauridsen, E. M.] Tech Univ Denmark, Riso Natl Lab Sustainable Energy, DK-4000 Roskilde, Denmark.;[Stampanoni, M.] Univ Zurich, Inst Biomed Engn, CH-8092 Zurich, Switzerland.;[Stampanoni, M.] ETH, CH-8092 Zurich, Switzerland.
Abstract: The morphology of a rod embedded in a matrix undergoing pinching by interfacial-energy-driven bulk diffusion is determined near the point of pinching. We find a self-similar solution that gives a unique temporal power law and interfacial shape prior to pinching and self-similar solutions after pinching. The theory is compared to experiments that employ in situ four-dimensional X-ray tomographic microscopy for rods of liquid or solid pinching by solute diffusion in the high-diffusivity liquid phase. The excellent agreement between experiment and theory confirms that the interfacial morphology near the singularity is universal both before and after pinching; the shape holds regardless of the material system and initial condition. This also implies that the predictions of the time-dependence of the process can be used to determine the time to pinching for a wide variety of physical systems, and thus provide estimates of the time required for capillarity-driven break-up of microstructures from the detachment of secondary dendrite arms to polymer blends. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keywords: WT.PERCENT CU ALLOY RAYLEIGH-INSTABILITY IN-SITU MORPHOLOGICAL EVOLUTION THERMAL-STABILITY SURFACE-DIFFUSION AL-CU DRIVEN SOLIDIFICATION MICROTOMOGRAPHY
收稿日期:10 December 2010     修回日期:13 April 2011     发布日期: 19 May 2011    
Insert title here
更多服务: 作者自存档 | 投稿导航 | 全球期刊检索 | 查找审稿人
关于我们 | 隐私申明 | 免责声明 | 意见反馈 | 合作服务
Magsci ©  版权所有
Copyright © 2010 - 2013 Magtech. All Rights Reserved.