2013 Fiscal Year Final Research Report
Dissolution behavior of nano-precipitate during severe plastic deformation
| Project/Area Number |
23560833
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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 |
Structural/Functional materials
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| Research Institution | University of Hyogo |
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Principal Investigator |
ADACHI Hiroki 兵庫県立大学, 工学(系)研究科(研究院), 准教授 (00335192)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 巨大ひずみ加工 / 結晶粒微細化 / 析出強化 / 加工硬化 / アルミニウム |
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| Research Abstract |
By TEM observations and SAXS measurements, it became clear that the deformation-induced dissolution of nano-precipitate during severe plastic deformation, SPD was generated by the dislocation cutting. This result suggests that the precipitate which is larger than the critical radius when the mechanism shifts from cutting to by-pass is difficult to dissolve by SPD. Thus, the nano-precipitates of the size, which were larger than the critical radius were dispersed in the grain by pre-aging and grain refinement was conducted by SPD. And then, by post-aging at low temperature for short time, by the act of the undissolved precipitate as a nucleus, nano-precipitaes can be dispersed in the ultra-fine grain. And as a result, it became possible that the precipitation hardening simultaneously occurred with the grain refinement hardening.
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