In situ formed two-phase metallic glass with surface fractal microstructure
In situ formed two-phase metallic glass with surface fractal microstructure
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DOI：
10.1016/j.actamat.2004.01.036
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发表时间：
2004-05-03
期刊：
影响因子：
9.4
通讯作者：
Hono, K
中科院分区：
文献类型：
--
作者：
K端ndig, AA;Ohnuma, M;Hono, K
发现La（27.5）Zr（27.5）Al（25）Cu（10）Ni（10）合金在淬火过程中发生相分离，形成富（La-Cu）和富（Zr-Ni）的玻璃相，其成分接近于Zr-Ni-Al和La-Cu-Al大块金属玻璃。淬火态样品由两个非晶相组成，呈球形，长度范围从几十微米到几纳米。利用扫描电子显微镜和透射电子显微镜观察了几代自相似的球中球。小角X射线散射结果显示出对散射矢量上的强度的-3.4的幂的指数依赖性，表明尺寸为2.6的表面分形微结构。从两相区获得的选定区域的衍射图案显示，两个清晰可辨的晕环和高分辨率电子显微镜图像显示具有两个不同的长度尺度对应于两个非晶相的平均原子距离的差异的各向同性迷宫图案。(C)2004 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The alloy La(27.5)ZR(27.5)Al(25)Cu(10)Ni(10) was found to phase separate during quenching from the melt into (La-Cu)-rich and (Zr-Ni)rich glassy phases with compositions close to those of Zr-Ni-Al and La-Cu-Al bulk metallic glasses. As-quenched samples consist of two amorphous phases in spherical shape with a wide range of length scales from tens of micrometers to a few nanometers. Several self-similar generations of spheres in spheres were observed using scanning electron microscopy and transmission electron microscopy. Small angle X-ray scattering results show an exponential dependence to the power of -3.4 of the intensity on the scattering vector, indicating a surface fractal microstructure of dimension 2.6. The selected area diffraction patterns obtained from two-phase regions show, two clearly distinguishable halo rings and the high resolution electron microscope image shows isotropic maze patterns with two different length scales corresponding to the difference in the average atomic distance of the two amorphous phases. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.