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Tensile properties of Co-based oxide dispersion strengthened superalloys

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Title: Tensile properties of Co-based oxide dispersion strengthened superalloys
Authors: Yu, Hao Browse this author
Ukai, Shigeharu Browse this author →KAKEN DB
Oono, Naoko Browse this author
Keywords: Co-based superalloys
Oxide dispersion strengthening
Strain-induced twin deformation
Issue Date: 2017
Journal Title: Journal of Alloys and Compounds
Volume: 714
Start Page: 715
End Page: 724
Publisher DOI: 10.1016/j.jallcom.2017.04.276
Abstract: Tensile properties of a novel Co-20Cr-5Al-2.4Hf-1.5Y(2)O(3) (wt%) oxide dispersion strengthened (ODS) superalloy were studied through a comparing investigation with Co-20Cr-5Al (wt%) alloy. Both the Co-based alloys (with and without oxide particles) were fabricated by mechanical alloying (MA), spark plasma sintering (SPS), hot rolling and the final annealing at 1200 degrees C. Due to the ultrafine grains of 500 nm in the ODS superalloy and 1.2 mu m in the ODS free alloy, the metastable fcc structure predominates at room temperature. Tensile testing was conducted at room temperature and 1000 degrees C. Strain-induced twinning deformation was evidenced by transmission electron microscopy and was found to significantly enhance the ultimate tensile strength (UTS) of the two alloys at room temperature. The Co-based ODS superalloy exhibits a superior tensile strength of 2.85 GPa at room temperature, which is associated with the distribution of twins and fine Y-Hf oxides. At 1000 degrees C, since the ultrafine grain size in the ODS superalloys, an easy grain boundary deformation occurred and resulted in a significant reduction in the UTS value. (C) 2017 Elsevier B.V. All rights reserved.
Rights: © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 余 浩

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