2021 Fiscal Year Final Research Report
Formation of spherical microstructure and its mechanical properties of non-ferrous metal alloy
| Project/Area Number |
19K04987
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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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| Review Section |
Basic Section 26010:Metallic material properties-related
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| Research Institution | Ehime University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
飯久保 智 九州工業大学, 大学院生命体工学研究科, 准教授 (40414594)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | マグネシウム合金 / 高圧合成 / 構造解析 / マイクロストラクチャー / ヘテロ組織 / 階層組織 |
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| Outline of Final Research Achievements |
Mg85Zn6Y9 is an alloy with a volume fraction of LPSO of almost 100%. This alloy undergoes a phase transition to a two-phase structure consisted of α-Mg and D03 superlattice under high-pressure and high-temperature, furthermore, it forms a unique spherical domain structure. This structure consisted of a core part in which grains <100 nm of the D03 were precipitated in the α-Mg Matrix and cell part in which consisted of columnar crystal, which were confirmed in the samples being after treated at 10 GPa/1273 K and 15 GPa/1273 K, respectively. However, it is not formed in the pressure and temperature below that. With the formation of the spherical domain structure, both strength and hardness increase significantly. Moreover, we attempted to form above-mentioned structure in the binary alloy system; however, it cannot form in present researches.
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| Free Research Field |
金属物性物理学
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| Academic Significance and Societal Importance of the Research Achievements |
軽量構造材料の開発は、輸送機器の省エネルギー、カーボンニュートラルを促進する上で重要なテーマである。本研究は、実用金属中最も低い密度を持つマグネシウム（Mg）をベースとする合金の強度についての基礎研究である。100nmを下回る二相組織からなるコア部と、コア部から伸びる柱状晶かなるセル部とで形成された階層型へテロ構造組織を有するMg合金を高圧合成で作製したところ、その強度はマグネシウム合金として極めて高いものとなった。この高強度は上記の階層的ヘテロ組織に由来する。これら強さを生み出す組織の探索は高強度材料探索ための手掛かりになると考えている。
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