Spectroscopic-Scattering analysis of local structures in MgYZn alloys

2016 Fiscal Year Final Research Report

• Project/Area Number: 26630294
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: Kyoto University
• Principal Investigator: OKUDA Hiroshi 京都大学, 工学研究科, 准教授 (50214060)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: LPSO / XAFS / MgYZn / SWAXS / クラスター

Outline of Final Research Achievements

We conducted XAFS and DAFS at SAXS regions of the Mg85Y9Zn6 ternary alloys, which has been known as a representative alloy system of LPSO structures having 18R structure. Since there are few XAFS reports showing local environmental structures of 18R- LPSO, we have examined the local structures around Zn and Y aroms using the both K edge XAFS signals. The XAFS analysis for the samples cast by ingot metallurgy showed that the atomic structures around Zn are strongly distorted, while those for Y is not so distorted. The present results are found to be in qualitatively good agreement with what have been found by TEM/ABF analysis by Kishida et al and Abe et al, while the results on earlier stage of LPSO formation is left unsolved due to reproducibility problems stemming from sample conditions.

Free Research Field

放射光材料評価学