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快速凝固Al-Mn合金中的几种分形结构

范传光 , 张萌 , 王元生 , 吴自勤

金属学报

本文用扫描电镜观察了快速凝固Al_(86)Mn_(14)合金中出现的分形结构。它们的分数维数从1.46至1.97。电子显微镜及X射线衍射仪确定此合金带中除了少量Al晶体外,大部分为二十面体准晶相.因此可以认为这些分形结构,是激冷过程中大量粒子扩散聚集的结果。

关键词: Al-Mn合金 , rapid solidification , fractal structure , fractal dimension

CRYSTALLIZATION AND FRACTAL STRUCTURE OF MOLYBDENA SINGLE CRYSTALS

ZHANG Jizhong LI Hengde Tsinghua University , Beijing , China

金属学报(英文版)

When a molybdenum sheet was heated properly at 900℃ in an oxidizing atmosphere, Mo_5O_(14) single crystals will grow.The size of the most coarse single crystal is up to 15×1.1 mm and 310 nm thick as measured by Rutherford backscattering spectrometry.Some fractal structure consisting of many molybdena whiskers were observed after heating at 750℃.An approach to explain the crystal growth and fractal structure has been discussed.

关键词: molybdena , null , null

SOME FRACTAL STRUCTURES IN RAPIDLY SOLIDIFIED Al-Mn ALLOY

FAN Chuanguang ZHANG Meng Jiangxi University , Structure Research Laboratory , University of Science and Technology of China , Academia Sinica Hefei , ChinaWANG Yuansheng WU Ziqin University of Science and Technology of China , Hefei , China

金属学报(英文版)

The fractal structures formed in rapidly quenched Al_(86)Mn_(14)alloy have been observed on SEM.Their fractal dimensions are from 1.46 to 1.97.The principal phase examined by TEM and X-ray diffractometer is icosahedral quasicrystalline one with a small amount of Al phase. It is believed that these fractal structures are formed by many aggregated particles during the rapid-quenching process.

关键词: Al-Mn alloy rapid solidification , null , null

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