Transformations and structures in the Al-Zn-Mg alloy system: A diffraction study using synchrotron radiation and electron precession
Transformations and structures in the Al-Zn-Mg alloy system: A diffraction study using synchrotron radiation and electron precession
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DOI：
10.1016/j.msea.2010.10.001
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发表时间：
2011-01-25
期刊：
影响因子：
6.4
通讯作者：
Gjonnes, J.
中科院分区：
文献类型：
--
作者：
Kverneland, A.;Hansen, V.;Gjonnes, J.
本文用旋进电子衍射和X射线同步辐射衍射研究了Al-Zn-Mg合金中硬化η ′相析出物的结构。后者被记录为一个三维的，连续的强度分布从一个单一的合金晶粒，从其中可以提取的沉淀颗粒的显着的锐度图案。高分辨电子显微镜显示了广泛的结构变化与多产的缺陷在eta'沉淀。根据基于平衡η-MgZn（2）结构中固有的两个二十面体元素的两种结构模型描述η '结构。这些二十面体的合金系统的转变中的作用进行了讨论。(C)2010爱思唯尔有限公司版权所有。
The structure of the hardening eta'-phase precipitates in Al-Zn-Mg alloys has been investigated by using precession electron diffraction and X-ray synchrotron radiation diffraction. The latter was recorded as a three-dimensional, continuous intensity distribution from a single alloy grain, from which patterns of remarkable sharpness from the precipitate particles could be extracted. High resolution electron microscopy revealed extensive structural variations with prolific faults in the eta' precipitates. The eta'-structures are described in terms of two structure models based on two icosahedral elements that are inherent in the equilibrium eta-MgZn(2) structure. The role of these icosahedra in the transformations of the alloy system is discussed. (C) 2010 Elsevier B.V. All rights reserved.