2016 Fiscal Year Final Research Report
Quantitative analysis of precipitation behavior for age-hardenable Copper-based alloys using extraction procedure
| Project/Area Number |
26420663
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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 |
Physical properties of metals/Metal-base materials
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SATO SHIGEO 茨城大学, 理工学研究科, 教授 (40509056)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 銅合金 / 熱処理 / 析出 / 抽出分離 / 強度 / 導電性 / 相変態 / 相平衡 |
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| Outline of Final Research Achievements |
It is important to understand variations of the morphology, structure, volume fraction, and composition of precipitates in age-hardenable copper alloys during aging, because their mechanical and physical properties are critically influenced by the precipitation behavior. In this study, extraction procedure has been employed to quantitatively evaluate the precipitation behavior of age-hardening copper alloys, such as Cu-Ti, Cu-Ni-Si, and Cu-Mg-P systems. When the alloys were submerged in an acid solution, only the Cu solid solution matrix was dissolved chemically, but both precipitates remained as insoluble residue. Subsequent structural and compositional analyses of the insoluble residue reveal the fraction and composition of the precipitates, together with those of the matrix. Therefore, we obtained refined microstructural information, and proposed the time-temperature-transformation diagram and revised phase diagram for some age-hardenable copper alloys.
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| Free Research Field |
金属材料
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