A unified projection formalism for the Al–Pd–Mn quasi-crystal Ξ-approximants and their metadislocations
A unified projection formalism for the Al–Pd–Mn quasi-crystal Ξ-approximants and their metadislocations
复制标题
Al-Pd-Mn准晶Ξ近似体及其元位错的统一投影形式
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
H. Trebin
中科院分区：
文献类型：
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作者：
M. Engel;H. Trebin
Al-Mn-Pd准晶的近似体α、α ′和β显示出有趣的塑性性质，例如，相子诱导的变形过程和位错。在这里，我们表明，相位和它们的变形或缺陷状态可以描述由一个简单的投影形式主义在三维空间，而不是像往常一样，在四到六个维度。利用这种方法，我们可以解释用电子显微镜观察到的相界的微观结构。此外，我们确定了最低能量的位错，并将它们与实验观察到的位错唯一地联系起来。由于在γ ′相中移动的位错可以产生新的相子平面，我们提出了从γ ′到γ ′的位错诱导相变。本文所建立的方法也适用于其它各种复杂金属合金。
The approximants ξ, ξ′ and of the Al–Mn–Pd quasi-crystal display interesting plastic properties, such as, for example, phason-induced deformation processes and metadislocations. Here we demonstrate that the phases and their deformed or defect states can be described by a simple projection formalism in three-dimensional space—not, as usual, in four to six dimensions. Using this method we can interpret the microstructures observed with electron microscopy as phasonic phase boundaries. Furthermore, we determine the metadislocations of lowest energy and relate them uniquely to experimentally observed ones. Since moving metadislocations in the ξ′ phase can create new phason planes, we suggest a dislocation-induced phase transition from ξ′ to . The methods developed in this paper can also be applied for various other complex metallic alloys.