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- Ameyama Kei
- Department of Mechanical Engineering, Faculty of Science and Engineering, Ritsumeikan University
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- Nakatani Masashi
- Graduate school of Science and Engineering, Ritsumeikan University
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- Kawabata Mie
- Department of Mechanical Engineering, Faculty of Science and Engineering, Ritsumeikan University
Bibliographic Information
- Other Title
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- 調和組織制御による革新的構造材料の創製
- チョウワ ソシキ セイギョ ニ ヨル カクシンテキ コウゾウ ザイリョウ ノ ソウセイ
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Description
<p>Harmonic Structure (HS) has a heterogeneous microstructure consisting of bimodal grain size together with a controlled and specific topological distribution of fine and coarse grains. In other words, the HS is heterogeneous on micro- but homogeneous on macro-scales. The most unique feature of HS is its continuously connected UFG Shell structure. In the present work, the HS design has been applied to pure metals and alloys via SPD powder metallurgy process. At a macro-scale, the harmonic structure materials exhibited significantly better combination of strength and ductility, as compared to their homogeneous microstructure counterparts. This behavior is essentially related to the ability of the HS to promote a large strain hardening and uniform distribution of strain during plastic deformation, leading to improved mechanical properties by avoiding or delaying localized plastic instability. Such outstanding mechanical properties of HS materials are attributed to the continuously connected UFG-Shell structure. This unique microstructure provides stress-concentration in the micro scale and stress dispersion in the macro scale.</p>
Journal
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- Journal of Functionally Graded Materials
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Journal of Functionally Graded Materials 32 (0), 1-6, 2018
Functionally Graded Materials FORUM of Japan