Materials Transactions Online

Materials Transactions, Vol.58 No.04 (2017) pp.539-542
© 2017 The Japan Institute of Metals and Materials

In-Plane Positional Fluctuations of Zinc Atoms in Single Crystal Mg85Zn6Y9 Alloy Studied by X-ray Fluorescence Holography

Koji Kimura1, Kouichi Hayashi1, Koji Hagihara2, Hitoshi Izuno2, Naohisa Happo3, Shinya Hosokawa4, Motohiro Suzuki5 and Hiroo Tajiri5

1Department of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
2Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, Suita, 565-0871, Japan
3Department of Computer and Network Engineering, Graduate School of Information Sciences, Hiroshima City University, Hiroshima 731-3194, Japan
4Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan
5Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Hyogo 679-5198, Japan

We performed X-ray fluorescence holography measurements on a single crystal Mg85Zn6Y9 alloy, having a synchronized 18R long period stacking ordered structure, and successfully obtained Zn Kα holograms. The reconstruction shows “U”-shaped atomic images in remarkable contrast to the prediction of an existing model with Zn6Y8 L12 clusters. To explain this feature we calculated holograms using a model with positional fluctuations, and fit the reconstruction to the experimental results. It was found that large rotational fluctuations of the clusters can explain the “U”-shaped images.

[doi:10.2320/matertrans.M2016459]

(Received 2016/12/26; Accepted 2017/01/30; Published 2017/03/25)

Keywords: magnesium alloys, synchronized long-period stacking ordered phase, local structure, x-ray fluorescence holography

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