| Project/Area Number |
16K18253
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tohoku University |
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Principal Investigator |
王 智 東北大学, 原子分子材料科学高等研究機構, 助手 (80747022)
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| Project Period (FY) |
2016-04-01 – 2017-03-31
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| Project Status |
Discontinued (Fiscal Year 2016)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | Aluminum alloys / high-strength / nanocrystalline / Al alloys / composites / metallic glasses |
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| Outline of Annual Research Achievements |
The need of advanced aluminum alloys with drastically higher specific strength emerged powerfully. However, a serious limitation of aluminum is that it is too soft. The scope is to study the microstructure and properties of the super-strong aluminum alloys with acceptable ductility. In this work, a super-high strength Al-Gd-Ni-Co alloy was produced and the wear and corrosion properties have been studied. Firstly, the results reveal that the nanostructure Al-Gd-Ni-Co alloy shows different corrosion behavior compared to the pure aluminum, because of the presence of high volume fraction of Al-based intermetallic compounds. The main corrosion mechanisms observed in the Al-Gd-Ni-Co alloy are found to be the pitting corrosion (corrosion of aluminum in the consolidated particles) and crevice corrosion (corrosion of aluminum in the inter-particle area). Secondly, for the high-strength aluminum alloys, the inter-particle regions, including soft aluminum and pores, are relatively weak compared to the consolidated particles. We have found plastic deformation, crack branching and deflection are observed in the inter-particle regions, giving rise to the arrest of cracks. The fracture mode of the Al-Gd-Ni-Co nanostructured alloy changes from the inter-particle failure to trans-particle failure with decreasing volume fraction of the inter-particle regions.
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