Gunther Eggeler, On the Nucleation of Planar Faults in Single Crystal Ni-base Superalloys
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference
YUCOMAT 2018
Herceg Novi, Montenegro, September 3–7, 2018
YUCOMAT 2018
Twentieth Annual Conference

Gunther EGGELER

Ruhr-Universität Bochum

Under conditions of low temperature (< 800°C) and high stress (> 600 MPa) creep, a<112> fault ribbons form in the microstructures of single crystal Ni-base superalloys. New experimental shear creep results are presented which show that a macroscopic <112>{111} shear test deforms much faster than a <110>{111} shear test. The reason is, that the two dislocation families with different Burgers vectors, which are needed in order to start the nucleation of a a<112> fault experience the same high resolved shear stress during <112>{111} shear testing.

Diffraction contrast diffraction contrast microscopy is performed to provide microstructural evidence for the presence/absence of planar faults.

Moreover, creep activation parameters n (stress exponent) and Q (apparent activation energy) are measured for the two macroscopic shear systems and are discussed in the light of previous results published in the literature.

Plenary lectures - YUCOMAT 2018

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