TY - GEN A1 - Bettge, Dirk A1 - Jiao, F. A1 - Österle, Werner A1 - Ziebs, Josef ED - Lütjering, G. T1 - An extended model of the tension-compression asymmetry of single crystal nickel-base superalloys T2 - 6th International Fatigue Congress CY - Berlin, Germany DA - 1996-05-06 PY - 1996 SN - 0-08-042268-3 VL - 2 IS - 2 SP - 885 EP - 889 PB - Pergamon CY - Oxford AN - OPUS4-2508 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bettge, Dirk A1 - Österle, Werner T1 - “Cube slip” in near-[111] oriented specimens of a single-crystal nickel-base superalloy N2 - In the past few years, it has been discussed with increasing frequency, whether cube slip does occur in gamma' hardened nickel-base superalloys. Occurrence of cube slip has consequences for the modeling of orientation dependence of the CRSS. Until now, there are only few experimental investigations. In principle, cube slip should be possible in primitive cubic lattices (e.g. L12 ordered gamma' phase) but not in face centered cubic ones (e.g. Ni solid solution). The most favourable specimen orientations are near [111], where the Schmid factors for this type of glide exceed those for octahedral systems. There are two basic methods to detect cube slip: macroscopic slip trace analysis and Transmission electron microscopy (TEM) investigation of the dislocation structure. Few observations of cube slip by macroscopic slip traces are reported in the literature. But it is still uncertain under which test conditions cube slip occurs and what the dislocation mechanisms are. Cube slip was observed during tensile or compression tests of several first generation superalloys, but it seems not to occur during shear creep deformation (e.g. CMSX-4 at 980°C), and it is also lacking under conventional tensile or compression loading, if the gmma' particles are small. No observations were ever reported of dislocations gliding on {001} planes in matrix channels. KW - Cube slip KW - Nickel-base superalloy KW - Dislocations KW - TEM PY - 1999 U6 - https://doi.org/10.1016/S1359-6462(98)00446-1 SN - 1359-6462 VL - 40 IS - 4 SP - 389 EP - 395 PB - Elsevier AN - OPUS4-38220 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bettge, Dirk A1 - Österle, Werner A1 - Ziebs, Josef T1 - Temperature dependence of yield strength and elongation of the nickel-base superalloy IN 738 LC and the corresponding microstructural evolution PY - 1995 SN - 0179-4841 SN - 0044-3093 VL - 86 SP - 190 EP - 197 PB - Hanser CY - München AN - OPUS4-2481 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -