Berlin 2005 – scientific programme

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M: Metallphysik

M 21: Intermetallische Phasen II

M 21.2: Talk

Saturday, March 5, 2005, 11:15–11:30, TU H2038

Variation of Lattice Distortion of Gamma Prime Phase in Creep-deformed Single Crystal Superalloy SC16 with Temperature — •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

The lattice distortion of gamma prime precipitates in creep-deformed single crystal superalloy SC16 was investigated by means of high resolution X-ray diffraction technique using synchrotron radiation. The specimens were deformed at 1223 K and 150 MPa to a creep strain of 0.5 temperature. Variations in FWHM can in principle be caused by changes in the size of gamma prime precipitates and by changes in the lattice distortion with temperature. A detailed analysis with respect to the above mentioned aspects led to the conclusion that the effect observed in the present study is essentially caused by temperature-dependent redistribution of internal lattice distortion between gamma prime precipitates and gamma matrix, rather than by changes in precipitate size.

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