| Project/Area Number |
24656426
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Material processing/treatments
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| Research Institution | Tohoku University |
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Principal Investigator |
ISHIDA Kiyohito 東北大学, 工学(系)研究科(研究院), 名誉教授 (20151368)
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| Co-Investigator(Kenkyū-buntansha) |
OHNUMA Ikuo 東北大学, 大学院工学研究科, 准教授 (20250714)
OMORI Toshihiro 東北大学, 大学院工学研究科, 助教 (60451530)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 結晶粒成長 / Cu基形状記憶合金 / 熱処理 / 異常粒成長 / 繰り返し熱処理 / 亜結晶粒 / Ｃｕ基形状記憶合金 / 正常粒成長 / ピン止め効果 / 超弾性特性 / 相対粒径 / 制震材料 |
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| Research Abstract |
The grain growth of beta(bcc) phase in Cu-Al-Mn base shape memory alloys has been studied. The abnormal grain growth was realized when the Cu-Al-Mn alloys were first quenched from the beta single-phase region at high temperature round 1173K and then was slowly cooled at about 773K, and subsequent heating to the beta single-region. The pseudo-single crystals due to abnormal grain growth were obtained by thermally cycling where beta phase leads to a precipitation and subsequent dissolution of the alpha phase. This abnormal grain growth phenomenon results from the formation of subgrain structure introduced through phase transformation, where the subgrain-boundary energy might be one of the driving force. These findings provide a method of fabricating a single-crystal or large-grain structure important for superelastic properties.
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