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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:

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Cluster Variation Model of Phase Behavior in Heusler-forming Alloy Systems
Competitive Partitioning and Decomposition Evolution in Nanocrystalline Alloys
Cross-Slip and Work-Hardening in Short-Range Ordered FCC Alloys
Effect of Bulk and Local Phase Transformation on Deformation Mechanisms
Interfacial Spinodals
Intrinsic Phase Stability and Continuous Phase Transformations in TiAlZrN Ultra-hard Nitride Coatings
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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