Abstract
Morphology changes of {gamma}{prime} precipitates during uniaxial stress of nickel base superalloy single crystals containing high volume fractions of {gamma}{prime} phase are well known. For negative misfit material and tensile stress in [001] direction, the initially cuboidal {gamma}{prime} particles transform into rafts oriented perpendicular to the load axis. In [011] orientation {gamma}{prime} rods, aligned perpendicular to the tensile external load direction, are generated. For the [111] load axis no shape changes were observed neither for tensile nor for compressive stresses. During investigations of creep anisotropy of CMSX-4 and microstructural evolution connected with creep in different orientations, the changes in matrix plate thickness occurring during creep at elevated temperatures are of interest. In [001] as well as in [110] orientation, bowing of dislocation dipoles in matrix channels is a frequently observed process which is controlled by the local resolved shear stress and the thickness of matrix plates. The rhenium containing alloy CMSX-4 has a volume fraction of about 70% of ordered {gamma}{prime} phase after standard heat treatment (solutioning: 1h/1,553 K, 2h/1,563 K, 6h/1,573 K and annealing 6h/1,413 K, 16h/1,143 K).
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