کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5436339 1509549 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The evolution of dendrites during coarsening: Fragmentation and morphology
ترجمه فارسی عنوان
تکامل دندریت ها در زمان بریدن: تقسیم بندی و مورفولوژی
کلمات کلیدی
دندریتیک، مرفولوژی، بخش بندی سریال، بازسازی، قطعه قطعه شدن دندریت،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

The process of fragmentation of dendrite arms during coarsening remains poorly understood. We perform isothermal coarsening experiments of dendritic solid-liquid mixtures using PbSn alloys aboard the International Space Station (ISS), since arms that fission from the stem do not sediment and thus can be detected. The morphology of the structure and the number of fragments (fissioned arms) were determined using three-dimensional reconstructions. The evolution of the microstructure, change in length scale, interfacial shape distributions, number and distribution of fragments as well as the connectivity of the structures (handles) across coarsening time are discussed. We find that: the inverse of surface area per unit volume SV−1 increases with time as t1/3 in a manner that is almost identical to a sample coarsened on earth; the number of fragments per unit volume scaled by SV−3 is independent of time. Thus, it is possible to predict the number of fragments during coarsening by a measurement of SV; the connectivity of the structures as measured by the number of handles in the structure scaled by SV−3 is also independent of coarsening time. We find that there is more coalescence of dendrite arms during coarsening than fragmentation.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 127, 1 April 2017, Pages 359-367
نویسندگان
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