Dislocation dynamics in a nickel-based superalloy via in-situ transmission scanning electron microscopy

• Published in: Acta materialia Vol. 168; pp. 152 - 166
• Main Authors: Stinville, J.C., Yao, Eric R., Callahan, Patrick G., Shin, Jungho, Wang, Fulin, Echlin, McLean P., Pollock, Tresa M., Gianola, Daniel S.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.04.2019
• Subjects: Dislocations dynamic; In-situ transmission scanning electron microscopy (TSEM); Nickel-based superalloy rené 88DT; Plastic localization; STEM detector; Twin boundary; Plastic localization; In-situ transmission scanning electron microscopy (TSEM); Twin boundary; STEM detector; Nickel-based superalloy rené 88DT; Dislocations dynamic
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/j.actamat.2018.12.061

Micro-tensile specimens of nickel-based superalloy oligocrystals were tested in-situ in an scanning electron microscope in transmission mode (TSEM) enabling observation of dislocations. The dynamics of dislocation motion during tensile loading were captured and correlated with the measured intermittencies during plastic flow recorded by high load- and temporal-resolution sensors. This investigation in particular focused on the dislocation behavior near twin boundaries with different slip configurations. A multiplicity of deformation mechanisms at the dislocation scale were observed within individual slip bands, including precipitate shearing, dislocation decorrelation and antiphase boundary-coupled shearing. These processes affect strain localization near twin boundaries and provide new defect-level insights on plastic localization and fatigue crack initiation in these alloys. [Display omitted]