| 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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| 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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