Publications

Dislocation networks in gamma/gamma’-microstructures formed during selective laser melting of a Ni-base superalloy

Heep, L. and Schwalbe, C. and Heinze, C. and Dlouhy, A. and Rae, C.M.F. and Eggeler, G.

SCRIPTA MATERIALIA
Volume: 190 Pages: 121-125
DOI: 10.1016/j.scriptamat.2020.08.019
Published: 2021

Abstract
A dislocation network which formed during selective laser melting (SLM) of a Ni-base superalloy was analyzed using scanning transmission electron microscopy (STEM). This network traverses an ordered Gamma'-phase domain, in between two adjacent Gamma-solid solution regions. The Gamma’-phase region has formed when two Gamma’-phase particles have started to coalesce, trapping the dislocation network in this ordered region so that it formed two dislocation families with pairs of anti-phase boundary (APB) coupled super partial dislocations. The network features are presented and unusual features (twist character and low APB energies), not previously reported, are discussed. © 2020

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