Electron microscopy and diffraction of icosahedral and decagonal quasicrystals in aluminium‐manganese alloys
Electron microscopy and diffraction of icosahedral and decagonal quasicrystals in aluminium‐manganese alloys
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铝锰合金中二十面体和十方准晶的电子显微镜和衍射
DOI：
10.1111/j.1365-2818.1987.tb01351.x
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
K. Chattopadhyay
中科院分区：
文献类型：
--
作者：
N. Thangaraj;G. Subbanna;S. Ranganathan;K. Chattopadhyay
对铝锰合金中二十面体和十面体准晶形貌的电镜观察支持异相成核模式。二十面体准晶体从无面状枝晶向面状颗粒的转变是组成的函数。虽然二十面体准晶体的电子衍射模式的多样性已被证明适用于许多合金，但Al - Mn、Al - Cr、Al - Mn - Si和Mg - Al - Zn - Cu合金的类似模式之间存在细微的强度差异。与二十面体准晶体的顶点中心二十面体相反，十面体准晶体的电子衍射图可以通过边缘中心二十面体来理解。讨论了二维准晶体的截断。
Electron microscopic observations on the morphology of icosahedral and decagonal quasicrystals in aluminium‐manganese alloys have been interpreted in favour of a heterogenous nucleation mode. The transition of icosahedral quasicrystals from nonfacetted dendrites to facetted particles occurs as a function of composition. While the variety of electron diffraction patterns to be expected from icosahedral quasicrystals has been demonstrated for a number of alloys, subtle intensity differences exist among analogous patterns from Al‐Mn, Al‐Cr, Al‐Mn‐Si and Mg‐Al‐Zn‐Cu alloys. Electron diffraction patterns from decagonal quasicrystals can be understood on the basis of an edge‐centred icosahedron as opposed to a vertex‐centred icosahedron for icosahedral quasicrystals. Truncation from two‐dimensional quasicrystals is discussed.