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    7.15】高溫合金前沿講座-第十二期(網絡報告)
    主講嘉賓:Prof. Steffen Neumeier
    題目:From Co-Al-W-alloys to advanced CoNi-base superalloys
     
    2021-07-12 | 文章來源:高溫結構材料研究部        【 】【打印】【關閉

    題目:From Co-Al-W-alloys to advanced CoNi-base superalloys

    主講嘉賓:Prof. Steffen Neumeier

    Friedrich-Alexander-Universitt Erlangen-Nürnberg, Department Materials Science and Engineering, Institute I, Martensstr. 5, 91058 Erlangen, Germany

    時間:2021年7月15日 下午15:00-17:00

    地點:郭可信樓109(選課學生集中觀看)

    Zoom會議鏈接:https://fau.zoom.us/j/61865544946?pwd=aXduZjNPblgxN043cm9VeEtIRy9jUT09

    會議ID:618 6554 4946

    會議密碼:723540

     

    報告簡介:

    The discovery of a Co3(Al,W) phase in the Co-Al-W system more than a decade ago stimulated worldwide research on γ/γ′ Co-base superalloys. However, the initial Co-Al-W-based alloys suffered from a poor oxidation resistance, low phase stability and very high density. In the following years, these issues have been overcome by moving from simple ternary alloys towards compositionally complex, multinary superalloys. In this talk, an overview about the effects of various alloying elements on the alloy system and the interdiffusion coefficients of transition metals in Co are presented. It is shown, how alloying elements affect the thermo-physical properties, microstructures, mechanical properties, oxidation resistance and diffusion, and how this resulted in the development of advanced γ/γ′ CoNi-base superalloys with promising properties. Special emphasis will be placed on the mechanical properties of single-crystalline superalloys as well as polycrystalline wrought alloys and the underlying deformation mechanisms. It will be demonstrated by transmission electron microscope and atom probe tomography investigations, for example, how rafting and segregation assisted shearing of the γ′ precipitate phase affects the creep properties at different temperatures. Additionally, the differences and similarities as well as advantages and disadvantages of these novel Co-base superalloys are compared to the established Ni-base superalloys and their future prospects are discussed.

    主講嘉賓簡介:

    Prof. Steffen Neumeier was born in Oct. 1979. He got doctoral degree at Friedrich-Alexander-Universitt Erlangen-Nürnberg (FAU) in 2009 under the supervision of Prof. Dr. M. Gken. He is a senior scientist and group leader of “High Temperature Materials” in FAU, Department Materials Science and Engineering, Institute I, Erlangen, Germany since 2011. He won the Young Scientist Award 2010 in Jun. 2010 and Masing Memorial Award 2016 in Sept. 2016. He is the member of German Society for Materials Science (DGM), the Association of German Engineers (VDI) and the Minerals, Metals and Materials Society (TMS). He is also the author and co-author of 98 peer-reviewed journals and proceeding articles. He gave 14 invited and more than 20 contributed talks at international conferences and workshops.

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