Journal
SCRIPTA MATERIALIA
Volume 190, Issue -, Pages 121-125Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.08.019
Keywords
Dislocation networks; Ni-base superalloys; Merging gamma'-particles; Scanning transmission electron microscopy; Anti-phase boundary energies
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Funding
- Deutsche Forschungsgemeinschaft DFG [SFB/TR 103]
- project ARMADIT [CZ.02.1.01/0.0/0.0/16_025/0007304]
- Rolls-Royce plc
- EPSRC (Engineering and Physical Science Research Council) [EP/H022309/1, EP/H500375/1]
- EPSRC [EP/M005607/1] Funding Source: UKRI
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The dislocation network formed during selective laser melting of a Ni-base superalloy was analyzed using scanning transmission electron microscopy (STEM). It was found that the network trapped in an ordered Gamma'-phase region formed two dislocation families with pairs of anti-phase boundary (APB) coupled super partial dislocations, exhibiting unusual features such as twist character and low APB energies.
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. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd.
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