東北大学 · 工学
Kyosuke Yoshimi教授の研究室では、高温構造材料の開発を目的として、Fe-Al系合金やMo-Si-B-O系複合材料の相関動態と微細構造制御に焦点を当てた研究を行っています。特に、格子欠陥の集積が引き起こすプランルフォールトやアンチフォース境界の形成機構を、電子線顕微鏡を用いて解明しています。また、超高温環境に耐える人工複合材料の設計においては、「擬似インサイト複合材料」という新概念を導入し、反応性の高い相間でも局所的平衡を実現する材料設計の新戦略を提案しています。
Figures are computed from collected data and may differ slightly.
Abstract Thermally introduced planar faults are investigated both in an Fe-35 mol.%Al binary alloy and in B, Cr, Pd and W added ternary alloys using transmission electron microscopy. Air cooling of the alloys from 1273 K followed by annealing at 698 K for 120 h introduces two types of planar faults. One type is the antiphase boundary (APB), which is observed in all of the alloys. The other is the complex planar fault having both APB and stacking fault characters, which is observed in only the B-
Polycrystalline B2 FeAl sheets containing 40 and 46 mol% aluminum were prepared by arc-melting and hot-rolling. After annealing at 1123 K, they were cooled to room temperature at three cooling rates; i.e. i) air-cooling (about 25 K·s−1), ii) 0.065 K·s−1 and iii) 0.01 K·s−1. Hardness values are localized around the average value except Fe-46 mol%Al cooled at 0.065 K·s−1. Hardness of the air-cooled samples is much higher than that of slowly cooled samples at 0.01 K·s−1 because of the introduction
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