In situ formed two-phase metallic glass with surface fractal microstructure

被引：289

作者：

Kündig, AA ^{[1
]}

Ohnuma, M ^{[1
]}

Ping, DH ^{[1
]}

Ohkubo, T ^{[1
]}

Hono, K ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

来源：

ACTA MATERIALIA | 2004年 / 52卷 / 08期

基金：

日本学术振兴会;

关键词：

metallic glasses; decomposition; composites; small angle x-ray scattering; HREM;

D O I：

10.1016/j.actamat.2004.01.036

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

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.

引用

页码：2441 / 2448

页数：8

共 23 条

[1]

MOLECULAR FRACTAL SURFACES [J].