The precession technique in electron diffraction and its application to structure determination of nano-size precipitates in alloys
The precession technique in electron diffraction and its application to structure determination of nano-size precipitates in alloys
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DOI：
10.1017/s1431927604040279
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发表时间：
2004-02-01
影响因子：
2.8
通讯作者：
Kverneland, A
中科院分区：
文献类型：
--
作者：
Gjonnes, J;Hansen, V;Kverneland, A
时效硬化铝合金中纳米级析出物的晶体结构是晶体学的一个挑战。嵌入沉淀物的选区电子衍射强度的实用性受到经由基质反射的双散射的限制。这种效应可以通过旋进技术显著降低，我们已经使用该技术从Al-Zn-Mg合金系统中的半相干亚稳η（′）-沉淀物收集了大量的强度数据。根据高分辨显微镜和电子衍射强度，提出了P-62 c空间群的结构模型。讨论了旋进技术用于定量电子衍射的优点。
Crystal structure of nano-scale precipitates in age-hardening aluminum alloys is a challenge to crystallography. The utility of selected area electron diffraction intensities from embedded precipitates is limited by double scattering via matrix reflections. This effect can be signally reduced by the precession technique, which we have used to collect extensive intensity data from the semicoherent, metastable eta(')-precipitate in the Al-Zn-Mg alloy system. A structure model in the space group P-62c is proposed from high-resolution microscopy and electron diffraction intensities. The advantages of using the precession technique for quantitative electron diffraction is discussed.