Microstructure Control of Co-Base ODS Alloys
As high-temperature metallic materials, Co-base ODS alloys were produced by means of mechanical alloying, spark plasma sintering and hot rolling. Co-3wt%Al-1.2wt%Hf-ODS alloy was found to be an attractive composite like material, which is formed by spinodal like decomposition. The metastable phases were traced by hard phase containing dense oxide particles and soft one containing less oxide particles. Their tensile stress at 1,000 °C was improved by Hf addition that forms Y2Hf2O7 type oxide particles and shortens their space distance.
Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He
K. Takezawa et al., "Microstructure Control of Co-Base ODS Alloys", Advanced Materials Research, Vols. 239-242, pp. 864-867, 2011