Berlin 2005 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

M: Metallphysik

M 50: Grenzfl
ächen II

M 50.4: Vortrag

Dienstag, 8. März 2005, 17:15–17:30, TU H2038

Influence of Tensile and Compressive Creep Deformation on Gamma/Gamma Prime Lattice Mismatch in Single Crystal Superalloys — •Weye Chen¹, Nora Darowski², Ivo Zizak², Gerhard Schumacher², Helmut Klingelhöffer³, and Wofgang Neumann¹ — ¹Humboldt University Berlin, Institute of Physics — ²Hahn-Meitner-Institute Berlin , Structure and Dynamics — ³Federal Institute of Materials Research and Testing, Berlin

Gamma/Gamma prime lattice mismatch has been measured in single crystal superalloy SC16 after tensile and compressive creep deformation. The measurements have bean performed at ambient temperature along [001] orientation using X-ray diffraction at BESSY. On both tensile and compressively creep-deformed specimens an orientation-dependence of lattice mismatch was observed. After tensile creep deformation an increase in lattice mismatch in the orientation parallel to the load axis and a decrease in the orientation perpendicular to the load axis were found. In the compressively creep deformed specimens, however, the lattice mismatch in both of the orientations develops in the opposite direction in comparison to that of tensile creep deformation. The relative change in lattice mismatch during compressive creep deformation is clearly smaller than that of the tensile creep-deformed specimens at comparable strains. These experimental observations are discussed on the basis of a dislocation model which involves the details of deformation nature of superalloys under tensile and compressive creep loading.

Work supported by DFG (Neu 646/5-3 and Schu 1254/3-4)