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

主讲嘉宾：Prof. Steffen Neumeier

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

时间：2021年7月15日 下午15:00-17:00

地点：郭可信楼109（选课学生集中观看）

Zoom会议链接：https://fau.zoom.us/j/61865544946?pwd=aXduZjNPblgxN043cm9VeEtIRy9jUT09

会议ID：618 6554 4946

会议密码：723540

 

报告简介：

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.

主讲嘉宾简介：

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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