Plasticity assisted redistribution of solutes leading to topological inversion during creep of superalloys

• Published in: Scripta materialia Vol. 186; pp. 287 - 292
• Main Authors: Antonov, Stoichko, Zheng, Yufeng, Sosa, John M., Fraser, Hamish L., Cormier, Jonathan, Kontis, Paraskevas, Gault, Baptiste
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2020; Elsevier
• Subjects: Acoustics; Atom probe tomography; Automatic; Biomechanics; Chemical Sciences; Creep; Dislocations; Electric power; Electromagnetism; Engineering Sciences; Fluid mechanics; Material chemistry; Materials and structures in mechanics; Mathematical Physics; Mechanics; Physics; Polymers; Quantum Physics; Reactive fluid environment; Segregation; Thermics; Topological inversion; Vibrations; Creep; Segregation; Atom probe tomography; Topological inversion; Dislocations; segregation
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2020.05.004

We have studied the large-scale plasticity assisted topological inversion in a Ni-based superalloy after creep at 850 °C. Multi-scale characterization from the micro- to the near-atomic scale was used to unravel the processes governing topological inversion of a Ni-based single crystal superalloy and reconstruct the resulting three-dimensional microstructure. A plasticity assisted redistribution of interacting solutes mechanism, where shearing dislocations mass-transport solutes, is proposed to explain the transition from a rafted to intricately interconnected (inverted) structure. The interplay between microstructural evolution and mechanical behavior is discussed in terms of applied stress and microstructural features, relating atomic-scale processes to macro-scale behavior. [Display omitted]