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Dr.-Ing. David Bürger
Lehrstuhl Werkstoffwissenschaft
Institut für Werkstoffe
Fakultät für Maschinenbau
Ruhr-Universität Bochum
Universitätsstr. 150
44780 Bochum

Gebäude ICFO, Ebene 04, Raum 341
Phone:
Fax:
+49 (0)234 32-29109
+49 (0)234 32-14235
Activities: Research Assistant
Investigation of elementary deformation processes which govern creep of single crystal Ni-base superalloys at temperatures around 800°C. David Bürger investigates the mechanical properties of single crystal Ni-base superalloys, especially the creep properties. He focuses on elementary deformation mechanisms which govern the early stages of creep. He uses double shear creep tests which allow to directly load specific microscopic crystallographic shear systems (with a Schmid factor of 1). It is for example possible to shear a {111} plane in a <110> direction. From the shear zones one can take out TEM foils, which contain the glide plane and thus allow to study dislocation segments in large areas. David Bürger analyzes the shape of individual creep curves as well as the stress and the temperature dependence of the minimum creep rate. He then correlates these mechanical data with microstructural TEM observations. In TEM he uses tilt experiments to establish specific two beam contrasts. Using effective invisibility criteria he can determine the Burgersvector of dislocations and the translation vector of ponalar faults. A key objective of David Bürger’s work is to provide experimental prove for the Wu-mechanism, a scenario which was proposed to rationalize double minimum creep, which is observed during creep at low temperatures and high stresses. Moreover, David Bürger investigates creep and microstrucutres of single crystal Ni-base superalloys, which were produced using selective electron re-melting as an additive manufacturing technique. This part of his work was performed in collaboration with project B3 (Carolin Körner) from SFB/TR 103.

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