Electrodeposition of supersaturated aluminum-based solid solutions for maximizing strength and corrosion resistance
| Project/Area Number |
22K14508
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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 | Kyoto University |
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Principal Investigator |
張 澤磊 京都大学, 工学研究科, 特定助教 (90913400)
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| Project Status |
Granted (Fiscal Year 2022)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | Electrodeposition / Aluminum alloy / Mechanical property / Corrosion resistance / Ionic liquid |
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| Outline of Research at the Start |
The strength and corrosion resistance are always mutually exclusive in Al alloys through general work and aging strengthening methods. This research will electrodeposit supersaturated Al(M) (M: alloying elements) solid solutions for maximizing their strength and corrosion resistance simultaneously.
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| Outline of Annual Research Achievements |
Aluminum (Al) strengthened through alloying followed by the deformation and/or aging is inherently subject to the conflict between strength and corrosion resistance due to coarse intermetallic particles (IMPs) in α-Al matrix. Accordingly, supersaturated solid solutions with a homogenous microstructure are proposed to defeat that conflict.
In the first stage of this research, the Al(Fe) supersaturated solid solutions have been obtained using typical 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl)－aluminum chloride (AlCl3) ionic liquids (ILs), where the coordination of dissolving Fe2+ have been clarified by spectroscopies together with ab initio calculation. The TEM and XRD demonstrated that Fe (1.5－14.1 at.%) could completely dissolve into α-Al matrix, and its contents were controlled via iron(II) chloride (FeCl2) concentrations in baths. Especially, these Al(Fe) alloys with higher Fe solid solubility prove to attain a simultaneous improvement in hardness and pitting corrosion resistance based on nanoindentation and cyclic polarization curves respectively.
In addition, our newly developed quaternary phosphonium-based ILs ([P14,6,6,6]Cl－AlCl3) could give Al(Si, 3－6 at.%) supersaturated solid solutions at room temperature, while their properties including hardness and corrosion resistance require further studies.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
To date, these two items (Electrodeposition of smooth and dense Al(M) solid solutions; Clarify the role of M in strength and corrosion resistance of Al(M)) of the research plan for this project, which involve the use of Fe as the solute element, have been completed. That will serve as a guide for the study of other solute elements.
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| Strategy for Future Research Activity |
Next, this study will take a deep insight into the precipitation behavior of IMPs, figuring out how their shape, size, and distribution vary with the temperature and time during the heat treatment. The effect of IMPs on strength and corrosion resistance will also be investigated.
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Report
(1 results)
Research Products
(3 results)
