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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Mechanical Behavior of Nuclear Reactor Materials and Components III
Presentation Title Deformation Twinning Versus Slip in Ni-based Alloys, Containing Pt2Mo-structured, Ni2Cr-typed Precipitates
Author(s) Hi Vo, K Dang, Fei Teng, Matthew Schneider, Stuart Maloy, Julie Tucker, Laurent Capolungo, Peter Hosemann
On-Site Speaker (Planned) Hi Vo
Abstract Scope Nickel-based alloys are extensively used in a wide range of extreme environments because of their exceptional mechanical properties. The interactions between the dislocations and LRO precipitates, in these alloys, dictate the deformation modes and plastic response. While the majority of studies have focused on L12-structured precipitate-strengthened Ni-based alloys, less work has considered the Ni-based alloys containing Pt2Mo-structured, Ni2(Cr,Mo)-typed precipitates. In these alloys, Pt2Mo-structured precipitates enable room-temperature deformation twinning in addition to slip, which increases strain hardenability measured from bulk mechanical testing. In this work, molecular dynamics examined the possible types of dislocation and Pt2Mo-structured precipitate interactions at low temperature. Combined with in situ micromechanical testing, the role of resolved shear stresses on dislocation partials was shown to directly influence the activation of slip versus twinning. Additionally, using an energy-based approach, molecular dynamics results demonstrated a novel twin formation process, caused by the dislocation interaction with the Pt2Mo-structured precipitates.
Proceedings Inclusion? Planned:
Keywords Characterization, Copper / Nickel / Cobalt,

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