APPROXIMANTS TO THE ICOSAHEDRAL AND DECAGONAL PHASES IN THE AL-CU-CR SYSTEM

被引：26

作者：

EBALARD, S ^{[1
]}

SPAEPEN, F ^{[1
]}

机构：

[1] HARVARD UNIV,DIV APPL SCI,CAMBRIDGE,MA 02138

来源：

JOURNAL OF MATERIALS RESEARCH | 1991年 / 6卷 / 08期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1557/JMR.1991.1641

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A 1/1-type approximant to the AlCuCr icosahedral phase and approximants to a decagonal phase have been found in an as-cast Al65Cu20Cr15 ingot. Selected area electron diffraction indicates that the 1/1-type approximant consists of Mackay icosahedra arranged on a bcc lattice, similar to the alpha-AlMnSi cubic phase. Ordering of the glue atoms produces a base-centered orthorhombic superstructure, making the overall structure monoclinic P2/m, with lattice parameters a = 12.6 angstrom, c = 17.92 angstrom, and alpha = 90-degrees.

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页码：1641 / 1649

页数：9

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