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Co-base superalloys and nanomechanical testing at high temperatures

  国家先进金属结构和功能材料科学与技术创新引智基地  (111 计划)

  Programme of Introducing Talents of Discipline to Universities  (111 Project)

  

  

  报告人/Speaker: Prof. Mathias Göken

   报告人工作单位/Affiliation: Friedrich-Alexander-University Erlangen-Nürnberg  

  日期/Date:2019年10月23日(星期三), Oct. 23 (Wednesday), 2019          

  时间/Time:9:30 - 11:00 AM

  联系人/Contact:Stoichko Antonov(韩宏泳, hanhongyong2017@163.com)

  报告地点/Location:北京科技大学主楼 353, 353 Main Building, USTB

  

  Co-base superalloys and nanomechanical testing at high temperatures

  Abstract

  γ/γ’ Co‐base superalloys have become an intensely investigated material in the last few years. They are regarded as potential candidates that could replace Ni‐base superalloys in some high temperature and high strength applications. These new Co-base superalloys are especially interesting candidates for polycrystalline wrought alloys, since they possess a quite low γ’ solvus temperature, which in combination with the high solidus temperature offers a wide processing and forging window. Nanomechanical testing has extended significantly our understanding of the mechanical behavior of such materials, which will be dicussed in the second part of the presentation. For example the influence of Boron on grain boundary strengthening effects has been studied by nanoindentations and atom probe tomography. Re has a remarkable positive effect on the creep strength of Ni-base superalloys. With micro-pillar testing it could be shown that Re plays only a minor role in Co-base superalloys. New indentation creep tests alloy also small scale creep tests at very high temperatures.

  Biography

  Mathias Göken studied Physics at the University Münster and did his PhD at the MPI for Iron Research, Düsseldorf in the field of fracture mechanics and in situ AFM observations of dislocation processes at crack tips (PhD approved by RWTH Aachen 1995). From 1996 to 2002 he was group leader for nanomechanics at the University of Saarland. From 1998-1999 he worked with a Feodor-Lynen fellowship in the group of William D. Nix at Stanford University (USA). In 2002 he accepted a Full Professorship at the Friedrich-Alexander-University Erlangen-Nürnberg, FAU. His track record includes more than 260 publications.

  The scientific work of Prof. Göken focuses on the mechanical behaviour and microstructure of advanced new materials and coatings and especially on high temperature materials and nanostructured materials. New Co-base superalloys have been developed in his group which show an exceptional creep strength and quite good oxidation properties. Nanomechanical testing approaches are developed in the Göken group, which allow measuring the properties of individual phases and close to interfaces. Furthermore, new nano-scaled lamellar metallic composites (LMCs) are produced in his group by accumulative roll bonding, ARB which show exceptional properties i.e. significantly higher strength and improved ductility and fatigue resistance.