Berlin 2005 – scientific programme
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M: Metallphysik
M 50: Grenzfl
ächen II
M 50.4: Talk
Tuesday, March 8, 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)