Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 803, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.140715
Keywords
Superalloy; Thermomechanical processing; Atom probe tomography; Creep; Precipitation
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science and ICT/MSIT) [NRF-2020R1A2C4002291, NRF-2018R1A5A6075959]
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Pre-straining of a Ni-based solid-solution-strengthened superalloy with serrated grain boundaries promotes the formation of rare nano-sized Ni3Al phase at 950 degrees C, rather than the predicted Ti(C,N) phase. Atom probe tomography revealed that the nano-sized precipitate is a unique γ' phase partitioned by over 14% of Cr atoms.
The 5% pre-straining of a Ni-based solid-solution-strengthened superalloy containing serrated grain boundaries promotes the formation of nano-sized precipitates, that is, the L1(2)-ordered Ni3Al phase, during creep at 950 degrees C, instead of the Ti(C,N) phase, as predicted by computational thermodynamics. Atom probe tomography revealed that the nano-sized precipitate was an uncommon gamma' phase partitioned by Cr atoms of more than 14 at%.
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