On the segregation of Re at dislocations in the γ’ phase of Ni-based single crystal superalloys

Wu, X. and Makineni, S.K. and Kontis, P. and Dehm, G. and Raabe, D. and Gault, B. and Eggeler, G.

Volume: 4 Pages: 109-114
DOI: 10.1016/j.mtla.2018.09.018
Published: 2018

We report evidence of Re and Mo segregation (up to 2.6 at.% and 1 at.%) along with Cr and Co to the dislocations inside of γ’ precipitates in a second generation Ni-based single crystal superalloy, after creep deformation at 750 °C under an applied stress of 800 MPa. The observed segregation effects can be rationalized through bridging the solute partitioning behavior across the γ/γ’ interface and the pipe diffusion mechanism along the core of the dislocation line. This understanding can provide new insights enabling improved alloy design. © 2018 Acta Materialia Inc.

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