CONVERGENT-BEAM ELECTRON-DIFFRACTION AND ELECTRON-MICROSCOPE STUDY ON DECAGONAL QUASI-CRYSTALS OF AL-CU-CO AND AL-CO ALLOYS

被引：29

作者：

SAITOH, K ^{[1
]}

TSUDA, K ^{[1
]}

TANAKA, M ^{[1
]}

TSAI, AP ^{[1
]}

INOUE, A ^{[1
]}

MASUMOTO, T ^{[1
]}

机构：

[1] TOHOKU UNIV, INST MAT RES, SENDAI, MIYAGI 980, JAPAN

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1994年 / 181卷 / pt 2期

关键词：

D O I：

10.1016/0921-5093(94)90744-7

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Decagonal quasicrystals of melt-quenched Al-Cu-Co and Al-Co alloys have been investigated by convergent-beam electron diffraction (CBED) and transmission electron microscopy. The CBED method has revealed that the space group of the alloys is non-centrosymmetric P10m2BAR. Al73Co27 is the first non-centrosymmetric binary quasicrystal. Dark-field microscopy has revealed the existence of inversion domains with an antiphase shift of c/2 at the domain boundaries. These results are analogous to those for the melt-quenched alloy Al70Ni15Fe15 (Saito et al., Jpn. J. Appl. Phys., 31 (1992) L109). However, structural phase transformation as a function of the transition metal composition, as observed for the Al-Ni-Fe system, does not occur in the present system, and two types of pentagonal atom cluster images are observed in high-resolution electron microscope images, but only one type in the Al-Ni-Fe alloys.

引用

页码：805 / 810

页数：6

共 15 条

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