Design and microstructure control of aluminum based superalloys based on thermodynamic calculation
| Project/Area Number |
17H03411
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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 |
Structural/Functional materials
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| Research Institution | Nagoya University |
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Principal Investigator |
Takata Naoki 名古屋大学, 工学研究科, 准教授 (70432523)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Fiscal Year 2017: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
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| Keywords | アルミニウム合金 / 金属間化合物 / 計算状態図 / 析出 / 高温強度 / 組織制御 / 時効析出 / 耐熱材料 |
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| Outline of Final Research Achievements |
We designed an aluminum (Al)-based alloy with the alpha-Al (fcc) matrix strengthened by the T-Al6Mg11Zn11 (cubic) intermetallic phase using a large two-phase region of alpha and T phases in the Al-Mg-Zn ternary system. Thermodynamic calculations assessed a composition of Al-5Mg-3.5Zn (at.%) for the designed alloy. The granular precipitates of the T phase were dispersed rather homogenously in the alpha-Al matrix at temperatures above 300°C. After aging at 200°C, numerous fine precipitates with a mean size of ~20 nm in the grain interior were observed. The present alloy (pre-aged at 200°C for 1 h) exhibited a high yield strength of approximately 260 MPa at 200°C, much higher than those of the conventional Al alloys.
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| Academic Significance and Societal Importance of the Research Achievements |
現状，耐熱性アルミニウム（Al）合金が自動車用エンジンのターボチャージャにおける圧縮機内部のインペラに使用されている．既存の合金の適応限界温度は160～180℃であり，エンジン高効率化には圧縮機内部の高温・高圧化による圧縮比向上の観点から，高温強度の向上が要求されているが，本研究はその社会的要求を満たす新たな耐熱Al合金の設計原理の基盤を構築したものである．
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Report
(4 results)
Research Products
(27 results)
