Development of Co-Al oxide dispersion strengthened (ODS) composite materials

2015 Fiscal Year Final Research Report

• Project/Area Number: 24360282
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Hokkaido University
• Principal Investigator: Ukai Shigeharu 北海道大学, 工学(系)研究科(研究院), 教授 (00421529)
• Co-Investigator(Kenkyū-buntansha): SASAKI Taisuke 国立研究開発法人物質・材料研究機構 (30615993) ; OONO NAOKO 北海道大学, 大学院工学研究院, 助教 (40512489)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 耐熱材料 / コバルト合金 / ODS合金 / 酸化物粒子 / 高温強度 / 耐酸化性

Outline of Final Research Achievements

As the new heat resistant materials, Co-Al based oxide dispersion strengthened (ODS) alloy was developed through alloy design in terms of thermodynamic analysis software, mechanical test and oxidation test at 1000 °C. Co-20Cr-10Al (wt%) has dual phases, consisting of the same volume fraction in hardened B2 phase and Co solid solution. Nano-oxide particles like Y2Hf2O7, Y2Hf7O17, Al2O3 are dispersed more densely inside Al-enriched B2 phase. High-temperature strength at 1000 °C could be affected by the grain boundary deformation due to fine grains less than 1 μm in size. Accelerated α-Al2O2 scale formation leads to excellent oxidation resistance under air condition at 1000 °C.

Free Research Field

エネルギー材料