Planar defects in the icosahedral phase in quasicrystal-forming AlCuFe alloys

被引：4

作者：

Shalaeva, E. V. ^{[1
]}

Prekul, A. F. ^{[2
]}

Nazarova, S. Z. ^{[1
]}

Khiller, V. V. ^{[3
]}

机构：

[1] Russian Acad Sci, Inst Solid State Chem, Ural Branch, Ekaterinburg 620990, Russia

[2] Russian Acad Sci, Inst Met Phys, Ural Branch, Ekaterinburg 620990, Russia

[3] Russian Acad Sci, Inst Geol & Geochem, Ural Branch, Ekaterinburg 620151, Russia

来源：

PHYSICS OF THE SOLID STATE | 2012年 / 54卷 / 04期

基金：

俄罗斯基础研究基金会;

关键词：

AL-CU-FE; ELECTRON-MICROSCOPY; TRANSFORMATIONS; DISLOCATIONS;

D O I：

10.1134/S1063783412040257

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Electron microscopy has revealed that, upon the formation of a stable icosahedral (i) AlCuFe phase, there arise a large number of planar defects. The revealed defects are nanometer-sized coherent intergrowths of the P1-pentagonal approximant. It has been found that the formation of these defects is the result of a nonequilibrium intermediate transformation. The intergrowths are located in the planes with the fivefold symmetry axis and give rise to an elastic-strain state of the i-phase. Analysis of the diffraction contrast has revealed the presence of phason and phonon atomic displacements due to the mismatch between the quasiperiodic (i-phase) and periodic (P1-phase) lattices. The formed structure exhibits a higher electrical resistance as compared to the i-phase and has been considered as a model state of the imperfect icosahedral phase with preferred phonon displacements.

引用

页码：699 / 707

页数：9

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