| Project/Area Number |
23K13577
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 26050:Material processing and microstructure control-related
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| Research Institution | Osaka University |
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Principal Investigator |
WANG QIAN 大阪大学, 接合科学研究所, 助教 (10961758)
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| Project Period (FY) |
2023-04-01 – 2025-03-31
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| Project Status |
Completed (Fiscal Year 2024)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2024: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2023: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | コールドスプレー / 金属3D積層 / 大変形 / 組織微細化 / 強度評価 / Additive manufacturing / Cold spray / Supersonic impact / Extreme deformation / Grain refinement |
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| Outline of Research at the Start |
An improved cold spray (CS) method is introduced to achieve high-quality, low-cost additive manufacturing (AM) of high-strength aluminum (Al) alloys. This research aims to elucidate the control mechanisms of in-process micro-forging on the three key features by establishing a supersonic impact-bonding simulation model, and to clarify the strengthening principles of the three key features on the overall mechanical performance of the CSAM high-strength Al alloys by establishing cross-scale strength evaluation simulation models.
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| Outline of Final Research Achievements |
This research focused on cold spray additive manufacturing (CSAM) of high-strength aluminum alloys, investigating supersonic impact-bonding and micro-forging mechanisms. A dislocation dynamics-based model was developed to clarify how micro-forging enhances void closure, grain refinement, and bonding. The model's accuracy was validated through experiments. Temperature control during deposition was found to eliminate delamination. In the final stage, fatigue performance before and after heat treatment was evaluated, and the model was extended to other supersonic impact processes such as laser shock peening. This work established a process-microstructure-performance relationship, supporting CSAM process optimization for high-strength metals.
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| Academic Significance and Societal Importance of the Research Achievements |
This research clarified key mechanisms in cold spray additive manufacturing (CSAM) and established a basis for process optimization. It contributes to material innovation and high-precision manufacturing, supporting Japan's smart industry and Society 5.0 initiatives.
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