| Project/Area Number |
21360311
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
NUMAKURA Hiroshi 大阪府立大学, 大学院・工学研究科, 教授 (40189353)
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| Co-Investigator(Kenkyū-buntansha) |
SEMBOSHI Satoshi 東北大学, 金属材料研究所, 講師 (00364026)
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| Co-Investigator(Renkei-kenkyūsha) |
TSUJI Nobuhiro 京都大学, 大学院・工学研究科, 教授 (30263213)
TERADA Daisuke 京都大学, 大学院・工学研究科, 助教 (80432524)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2010: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2009: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
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| Keywords | 格子欠陥 / 結晶塑性 / 力学特性 / 微細組織 / 回復・再結晶 / 結晶粒微細化 / 弾性 / 内部摩擦 / メカニカル・スペクトロスコピー |
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| Research Abstract |
Severely cold-worked metals by special shape-invariant deformation techniques exhibit such interesting mechanical properties as unusual strength and super-plasticity. In the present research, we have studied the type and the density of the defects introduced by the deformation and their thermal stability by various techniques such as measurements of electrical resistivity and dynamic elastic modulus. It has been found that the size of crystal grains is reduced less efficiently in materials of higher purity, indicating that impurities are advantageous for preparing ultra-fine-grained metals. It also turned out that impurities contribute to the thermal stability of the defects and the fine-grained microstructure.
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