| 研究課題/領域番号 |
20K15057
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| 研究機関 | 東北大学 |
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研究代表者 |
孫 飛 東北大学, 材料科学高等研究所, 助教 (00836562)
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| 研究期間 (年度) |
2020-04-01 – 2023-03-31
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| キーワード | Ni-Fe-based superalloy / L12 ordered precipitate / Orowan mechanism / Dislocation |
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| 研究実績の概要 |
Ni-Fe-based alloys with desirable and stable microstructure have been obtained after appropriate heat treatment processing. Tensile tests have been carried out at room temperature and high temperatures. Microstructure characterization using optical microscopy, SEM, and TEM has been performed to investigate the deformation behavior and related microstructure evolution. Complex dislocation configurations have been observed at different temperatures in terms of slip bands, Orowan process, and shearing process. The critical size of L12 precipitate for dislocation movement transfering from Orowan looping to shearing has been calculated, which is also consistent with the experimental observation using TEM. Deformation behavior and microstructure evolution have been well investigated.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
The research has been going smoothly until now. This is mainly because the research plan has been made step by step carefully. Each step has been carried out successfully and even with unexpectedly good results. All the facilities needed to be used have been reserved in advance to save time and also make the process at a good pace.
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| 今後の研究の推進方策 |
According to the current results, creep tests will be considered to carry out to investigate the dislocation interactions with the grown-up L12 precipitate during the long creep term. Multi Orowan process will be possible and expected during the long creep term. Such effect on the creep property will be identified. Moreover, some important parameters will be considered to clarify those strengthening effects. In addition, the simulation will be also to carried out to propose some affecting factors. Finally, the research results will be well estimated during the last period.
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| 次年度使用額が生じた理由 |
The fees for mechanical tests and microstructure characterization are needed. In addition, travel fees are also needed for collaboration.
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