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Meeting MS&T21: Materials Science & Technology
Symposium Deformation-induced Phase Transformations
Presentation Title Localized Phase Transformation at Stacking Faults and the Corresponding Alloy Design Strategy
Author(s) Longsheng Feng, Ashton Egan, Timothy M Smith, Shakthipriya Baskar , Michael J. Mills, Maryam Ghazisaeidi, Yunzhi Wang
On-Site Speaker (Planned) Longsheng Feng
Abstract Scope Recent experimental studies found localized phase transformations (LPTs) at stacking faults in several Ni-based superalloys that significantly enhances creep resistance. Yet the mechanisms underlying the LPTs, in particular, how alloy compositions impact such phenomena are still unclear, imposing challenges to utilize LPTs in alloy design. We present a thermodynamic analysis of the LPT phenomena and address some critical questions such as why LPT happens, why LPT is confined at the stacking faults and how it impacts the mechanical properties. Such a thermodynamic analysis allows us to develop new alloy design criteria for LPT-strengthening, which is used to develop a high-throughput computation framework using CAPHAD to find new superalloys with maximized LPT effect. This work is supported by NSF under the DMREF program.


Accounting for Phase Transformation in Plastic Anisotropy Modeling of SS316L
Analysis of Stress State of Plastic Medium Influence on Structural Transformations in Low-alloy Steels
Ausforming of Ferrium M54 Ultra-high Strength Steel
Engineering Microstructures for Conventionally and Additively Manufactured Ni-based Superalloys
Influence of 3D Microstructure on Deformation-induced Martensitic Transformation Studied by In Situ High-energy Diffraction Microscopy and Crystal Plasticity Modeling
Intrinsic Coupling between Deformation Twinning and Phase Transformation in NiTi Shape Memory Alloys and Metastable Beta Ti-alloys
Localized Phase Transformation at Stacking Faults and the Corresponding Alloy Design Strategy
P1-18: Bimetallic Billets for Magnesium-thermal Production of High Quality Sponge Titanium
P1-19: High-cut Steel Property Researches For Taps’ Manufacture
Solid Phase Plasticity Mechanisms in Metals and Rocks during Shear Deformation
Wire Size Effect on the Nucleation of Fatigue Cracks Near Non-metallic Inclusions in Superelastic Nitinol

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