Slip geometry of dislocations related to cutting of the γ′ phase in a new generation single-crystal superalloy

Investigation of oxidation characteristics and atomic partitioning in platinum and ruthenium bearing single-crystal Ni-based superalloys

“…Additions of Ru to high refractory content single-crystal Ni-base superalloys are currently being effectively used to enhance high-temperature phase stability and creep resistance [24,25] in turbine blade applications. Although preliminary investigations involving other platinum group metal additions have also been conducted, [2,12,13] none of these studies used single-crystal superalloys containing both Pt and Ru additions.…”

Creep of a nickel-based single-crystal superalloy during very high-temperature jumps followed by synchrotron X-ray diffraction

“…. Second, the local stress field of these dislocations protects the c 0 precipitates from deformation by ah1 0 0i superdislocations [22,32,33]. Such superdislocations are believed to be responsible for the acceleration of the creep deformation by relaxing coherency stresses and osmotic forces as they allow the removal of a/2h1 1 0i dislocations present at the c/c 0 interfaces [28,[34][35][36][37][38][39].…”

Effects of Ru additions on the microstructure and phase stability of Ni-base superalloy, UDIMET 720LI

“…This is a somewhat unexpected result, as Ru additions to single-crystal superalloys have primarily been aimed at stabilizing the microstructure to suppress the formation of the TCP phase at high temperatures, as shown in previous studies. [8,9] As shown in Section III, the approximate composition of the phase is (Cr 0.5 ,Mo 0.1 ) (Ni 0.2 ,Co 0.2 ); thus, its main composition is Cr. Lu et al [16] suggested that the formation of the phase is catalyzed by Cr segregation onto the ␥ matrix.…”

“…Recently, additions of platinum-group metals (PGMs), such as Ru, have been conducted in Ni-base alloys [7,8,9] to improve their microstructural stability and to suppress the formation of the TCP phase, which improves the high-temperature creep properties. For example, the Ni-base superalloy TMS-162, containing 6 wt pct Ru, has good microstructural stability during high-temperature creep, because the formation of the TCP phase is successfully suppressed by the Ru additions.…”