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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
Presentation Title An in-situ elevated temperature investigation of plasticity and damage evolution in a Ni-based superalloy
Author(s) Prafull Pandey, Shaolou Wei, Cemal Cem Tasan
On-Site Speaker (Planned) Prafull Pandey
Abstract Scope The present work reveals, via integrated in-situ scanning electron microscopy and post-mortem analyses, the strain rate effect on deformation and damage evolution in a Ni-based superalloy at 700 C. The alloy tested at strain rates of 4 10-4 and 4 10-3 s-1 show similar yield strength, whereas better ultimate tensile strength and ductility at higher strain rate. The deformation mechanism study using electron channeling contrast imaging reveals planar slip at the lower strain rate, resulting in local stress development and crack nucleation at grain boundaries. Thus, the intergranular cracking is observed as the major softening and damage mechanism at lower strain rate. In contrast, at higher strain rate, the deformation process involves cross slip events which result in high-density dislocation wall formation. We also discuss the origins of the observed slip planarity at lower strain rate by carrying out various microstructural analyses down to the atomic scale.
Proceedings Inclusion? Planned:
Keywords Copper / Nickel / Cobalt, High-Temperature Materials, Mechanical Properties

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