Electron diffraction analysis of plastically deformed icosahedral Al-Pd-Mn single quasicrystals

被引:18
作者
Franz, V
Feuerbacher, M
Wollgarten, M
Urban, K
机构
[1] Johannes Gutenberg Univ Mainz, Inst Phys Chem, D-55099 Mainz, Germany
[2] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany
关键词
D O I
10.1080/095008399177174
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A technique is presented to determine quantitatively the phason strain fields in quasicrystals by electron diffraction analysis in a transmission electron microscope. The deviation vectors of diffraction spots from their ideal positions are measured and related to their physical and orthogonal reciprocal coordinates. Investigations have been performed on as-grown as well as plastically deformed Al-Pd-Mn single quasicrystals. It was found that the magnitudes of the shifts of the spots depend linearly on the length of the perpendicular-space component of the reciprocal coordinates, while such a correlation was not found for the respective physical-space component. This behaviour evolves more clearly with increasing plastic strain. The measured spot shifts were fitted according to a linear vector equation relating the shifts to the perpendicular reciprocal vectors. This provides the possibility of determining the entries of the first two rows of the so-called 'phason matrix'. It was found that the values of the matrix entries vary with position in a given sample and that they increase with increasing amount of plastic deformation.
引用
收藏
页码:333 / 342
页数:10
相关论文
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