Spectroscopic-Scattering analysis of local structures in MgYZn alloys

• 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
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: LPSO / XAFS / MgYZn / SWAXS / クラスター / Mg 合金 / 小角散乱 / 相転移 / 局所構造 / L12 / SAS

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.

Research Products

• [Journal Article] Development of microstructures in rapidly-quenched Mg85Y9Zn6 alloy ribbons during heating at a constant speed examined by simultaneous small- and wide angle scattering measurements (2016)
  • Author(s): H. Okuda
  • Journal Title: Acta Materialia Volume: 118 Pages: 95-99
  • DOI: 10.1016/j.actamat.2016.06.028
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Nanoclusters first: hierarchical phase transformation in a novel Mg alloys (2015)
  • Author(s): H.Okuda, M.Yamasaki, Y.Tanaka, M.Tabuchi, H.Kimizuka
  • Journal Title: Scientific Reports Volume: 5 Issue: 1 Pages: 14186-14186
  • DOI: 10.1038/srep14186
  • NAID: 120005661770
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Stability of Long-Period Stacking Ordered Structures at Elevated Temperatures Examined by Multicolor Synchrotron Radiation X-ray Scattering/Diffraction Measurements (2015)
  • Author(s): Hiroshi Okuda, Toshiki Horiuchi, Hiroto Tanaka, Michiaki Yamasaki, Yoshihito Kawamura, and Shigeru Kimura
  • Journal Title: MATERIALS TRANSACTIONS Volume: 56 Issue: 7 Pages: 906-909
  • DOI: 10.2320/matertrans.MH201402
  • NAID: 130005083544
  • ISSN: 1345-9678, 1347-5320
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] MgYZn中濃度組成域でのＬＰＳＯ形成経路の検討 (2017)
  • Author(s): 奥田浩司 （院）田中浩登 安岡佑樹 東森稜 山崎倫昭 河村能人
  • Organizer: 日本金属学会 春季大会
  • Place of Presentation: 首都大東京 南大沢
  • Year and Date: 2017-03-15
• [Presentation] Use of tender X-rays for depth-dependent structure analysis of self-organized thin films and related materials (2016)
  • Author(s): H.Okuda
  • Organizer: GISAS2016
  • Place of Presentation: DESY, Hamburg, Germany
  • Year and Date: 2016-11-16
  • Int'l Joint Research / Invited
• [Presentation] Mg85Gd9Zn6アモルファス合金の等速昇温過程でのＬＰＳＯ形成過程 (2016)
  • Author(s): 奥田浩司 （院）田中浩登 安岡佑樹山崎倫昭 河村能人
  • Organizer: 日本金属学会 秋季大会
  • Place of Presentation: 大阪大学 工
  • Year and Date: 2016-09-21
• [Presentation] MｇYZnーLPSO構造形成過程におけるクラスターの局所構造の検討 (2015)
  • Author(s): 杉野智裕、田中浩登、奥田浩司、山崎倫昭、河村能人、田渕雅夫
  • Organizer: 軽金属学会関西支部研究会
  • Place of Presentation: 大阪府立大 難波サテライト
  • Year and Date: 2015-12-16
• [Presentation] Hierarchical Phase Transformation of Long Period Stacking Ordered Structures in MgYZn alloys (2015)
  • Author(s): H.Okuda, M.Yamasaki, Y.Kawamura, H.Kimizuka, M.Tabuchi
  • Organizer: CMRI
  • Place of Presentation: 仙台 国際会議場
  • Year and Date: 2015-10-13
  • Int'l Joint Research / Invited
• [Presentation] 急速凝固Mg85Y9Zn6リボンの等速昇温過程におけるLPSO形成過程のIn-situ評価 (2015)
  • Author(s): 田中浩登、奥田浩司。白武隆弘、山崎倫昭、河村能人
  • Organizer: 日本金属学会秋季大会
  • Place of Presentation: 九州大学 伊都キャンパス
  • Year and Date: 2015-09-16
• [Presentation] Formation process of Long-period stacking ordered structures in rapidly/slowly quenched Mg85Y9Zn6 alloys (2015)
  • Author(s): H.Okuda, H.Tanaka,T.Horiuchi, M.Yamasaki, Y.Kawamura, S.Kimura,HKimizuka
  • Organizer: International conference on small-angle scattering, SAS2015
  • Place of Presentation: Berlin,Gernmany
  • Year and Date: 2015-09-13
  • Int'l Joint Research
• [Presentation] シンクロLPSO組織形成Mg合金の変態初期過程におけるクラスター配置の解析 (2015)
  • Author(s): 奥田浩司，堀内俊希田中浩登山崎倫昭 河村能人木村滋 小原真司 五十嵐教之 清水伸隆
  • Organizer: 日本放射光学会年会
  • Place of Presentation: 立命館大学草津C
  • Year and Date: 2015-01-08 – 2015-01-10
• [Presentation] GISAXS measurements near the absorption edge of P (2014)
  • Author(s): Hiroshi OKUDA１ ， Takayoshi YAMAMOTO１ ，Kohki TAKESHITA１ ， Mitsuhiro HIRAI2 Shin-ichi Sakurai, Yorhsinori KITAJIMA3 ，，Noriyuyki Igarashi, Nobutaka Shimizu, Hiroki OGAWA3
  • Organizer: ALS UM Workshop
  • Place of Presentation: ALS, Berkeley Lab. CA
  • Year and Date: 2014-10-07 – 2014-10-08
  • Invited
• [Remarks]
  • URL: http://mcmd.mtl.kyoto-u.ac.jp
• [Remarks] 奥田HP
  • URL: http://mcmd.mtl.kyoto-u.ac.jp/