| Project/Area Number |
18K18949
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 26:Materials engineering and related fields
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| Research Institution | Osaka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
趙 研 大阪大学, 工学研究科, 講師 (00633661)
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| Project Period (FY) |
2018-06-29 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | ハイエントロピー合金 / カクテル効果 / 形状記憶合金 / 超弾性 |
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| Outline of Final Research Achievements |
Single crystalline specimens of bcc-HfNbTaTiZr high entropy alloys can be obtained from the coarse grains and the deformation behavior was investigated. As a result, the single crystals exhibit a high yield strength around 1000MPa at room temperature. It is also noted that high strength can also be obtained at 600℃ due to the precipitation of the hcp phase. The deformation behavior of non-equiatomic (TiZrHf)100-x(NbTa)x and V-doped alloys was also examined. The phase constituent and phase transformation of the non-equiatomic alloys are found to be similar to those of Ti-based and Zr-based alloys. However, at present, elastic anomaly, shape memory effect and superelasticity which are typical in β-Ti alloys cannot be observed.
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| Academic Significance and Societal Importance of the Research Achievements |
申請者の知る限り、HfNbTaTiZrハイエントロピー合金のバルク単結晶を用いて、その変形挙動に関する研究を行ったのは、申請者らが世界で初めてである。さらに、HfNbTaTiZr合金を初めとするbccハイエントロピー合金をβチタン合金に見立てて、構成元素を(TiZrHf)と(NbTa)とに分けて考え、形状記憶・超弾性合金としての可能性を探るアイディアは、申請者が世界で最初に提案したものである。学会発表などを通じて、こうしたアイディアが広まり、新しい研究開発の潮流が生まれている。
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