| Project/Area Number |
25420770
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Akita University |
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Principal Investigator |
Saito Kaichi 秋田大学, 工学(系)研究科(研究院), 教授 (10302259)
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| Co-Investigator(Renkei-kenkyūsha) |
HIRAGA Kenji 東北大学, 名誉教授 (30005912)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 結晶・組織制御 / マグネシウム合金 / Mg alloys / Precipitation / Crystal structure / Microstructure / TEM / Mg合金 / 析出強化 / 長周期積層構造 |
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| Outline of Final Research Achievements |
Microstructure control for Mg-Y-Zn alloy system, by a combined technique of the addition of a few other rare earth elements (RE) such as Ce and Gd and hot-rolling treatment additionally employed, has been thoroughly investigated in an attempt to improve its mechanical properties. The Ce addition of an appropriate amount to the alloy allows GP-zones to form densely in a dual microstructure of LPSO phase and Mg-solid solution. The Gd addition, instead, allows fine precipitates of Mg7RE orthorhombic phase (’-phase) to coexist. The substitution of Al for Zn in a part or all make the existing LPSO phase more highly ordered. Furthermore, it has proved that a combination of hot-rolling and low-temperature aging treatment can cause a refinement of precipitates. It is, thus, suggested that all of these alloying and thermomechanical treatments tested in this study are substantially effective in improving the mechanical property.
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