Phason defects in Al-Pd-Mn approximant phases

被引：64

作者：

Klein, H ^{[1
]}

Audier, M ^{[1
]}

Boudard, M ^{[1
]}

deBoissieu, M ^{[1
]}

Beraha, L ^{[1
]}

Duneau, M ^{[1
]}

机构：

[1] ECOLE POLYTECH,CTR PHYS THEOR,F-91128 PALAISEAU,FRANCE

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1996年 / 73卷 / 02期

关键词：

D O I：

10.1080/01418619608244385

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Structural defects, observed by TEM, in Al-Pd-Mn approximant phases are identified as phason defects. Assuming their motion under an applied shear strain, it is shown that two approximant phases can be related between them by a phase transformation occurring through plastic deformations. Then, other approximant phases, experimentally observed, can be interpreted as intermediate states of such a phase transformation. Atomic motions corresponding to these phason shifts are partly examined on the basis of HREM observations and crystallographic data, obtained from a single-crystal X-ray study on one of these approximants. The description of this transformation in six-dimensional hyperspace is proposed in order to establish a relationship with the icosahedral quasicrystalline state. The possibility that a plastic deformation of the icosahedral phase, occurring without the strain-hardening effect, could only result in a motion of phason defects is briefly discussed.

引用

页码：309 / 331

页数：23

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