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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Continuous Phase Transformations
Presentation Title Short-range clustering and ordering evolution of Ni-22Cr-13Mo alloy
Author(s) Po-Cheng Kung, Jessica Anne Krogstad
On-Site Speaker (Planned) Po-Cheng Kung
Abstract Scope The ability to predict short-range clustering (SRC) and ordering (SRO) structures enables mechanical properties tailoring in Ni alloys by precipitation hardening and glide plane softening. In present work, a short-range structure was found in the quenched Ni-22Cr-13Mo alloy (Hastelloy C22). The additional weak electron diffraction spots caused by this structure have been reported in another Ni-Cr alloy and referred as a consequence of SRO formation. However, in-depth diffraction pattern analysis and atomic resolution scanning transmission electron microscope image show that the weak diffraction in Hastelloy C22 is caused by Mo-rich discs lying in {111} planes. After annealing at 300 °C for 34 days, these disordered clusters grew larger and could eventually become the precursor of Ni<sub>2</sub>(Mo,Cr) SRO, which has been reported in this alloy, if prolong the annealing time or increase the temperature. The continuous evolution of these clusters at high temperature is demonstrated by in-situ electron diffraction experiment.
Proceedings Inclusion? Planned:

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Magnetically Driven Short-Range Order in the CrCoNi System
Microstructural engineering of Ni-based superalloys processed by conventional and additive manufacturing
Phase-Field Modelling of Transformation Pathways and Microstructural Evolution in MPEAs (Multi Principle Element Alloys)
Phase competition in the two steps continuous phase transformation during solidification of Terbium
Short-range clustering and ordering evolution of Ni-22Cr-13Mo alloy
Structural transformations driven by irradiation in the high defect density limit.
Study of Precipitation Behavior of High-Cr Ni-based Filler Metals using In-situ S/TEM
Thermodynamics of the Invar Transition: Phonons vs. Magnetism

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