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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Defect and Phase Transformation Pathway Engineering for Desired Microstructures
Presentation Title Phase Transformation Pathways in High Entropy Alloys or Complex Concentrated Alloys mediated by Defects
Author(s) Sriswaroop Dasari, Bharat Gwalani, Yao-Jen Chang, Deep Choudhuri, Stephane Gorsse, An-Chou Yeh, Rajarshi Banerjee
On-Site Speaker (Planned) Sriswaroop Dasari
Abstract Scope This presentation will demonstrate the strong influence of defects, induced by thermo-mechanical processing, on the phase transformation pathway adopted for second-phase precipitation in high entropy alloys (HEAs) or complex concentrated alloys (CCAs), such as Al0.3CoCrFeNi, Al0.5Co1.5CrFeNi1.5, and Al0.3CoFeNi. A thermo-mechanical processing sequence of homogenization - cold-rolling - solution treatment, followed by a precipitation anneal at a lower temperature, results in homogeneous nanometer scale-ordered L12 (gamma prime-like) precipitates within the face-centered cubic (FCC) matrix. Contrastingly, if the cold-rolled alloys is directly annealed at the precipitation temperature, then the resulting microstructural evolution pathway changes completely, with precipitation of B2 phase, either at the grain boundaries of recrystallized FCC grains and/or on twins and deformation bands within non-recrystallized grains. These experimentally observed variations in transformation pathway have been rationalized via the competition between the thermodynamic driving force and activation barrier for second-phase nucleation in this alloy, coupled with the kinetics of the process.
Proceedings Inclusion? Planned:

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Anisotropic Thermal Lattice Expansion and Crystallographic Structure of Strontium Aluminide within Al-10Sr Alloy as Measured by In-situ Neutron Diffraction
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Development of Superalloys Driven by Atomic-scale Interactions of Solutes with Crystal Defects
Evolution of Metastable Grain Boundaries and Its Implications on Nanocrystals’ Hardness Variation
Evolving Core Structures in Dislocation-twin Boundary Interactions
Exploring the Microstructure of Sputtered Nanotwinned Alloys and Its Role in the Study of Dislocation-Twin Interactions
Grain Boundary Segregation for Thermal Stability in Ternary Nanocrystalline Alloys
Grain Boundary Segregation in Immiscible Alloys: Anisotropy and Trijunction Effects
High-temperature Bulk Dislocation Dynamics in Aluminum
Interaction between Martensite Transformation and Ion-induced Damage in Shape Memory Alloys
Interactions between Lattice Dislocations and 3D Metallic Interfaces
Interfacial Segregation and Segregation-induced Transitions in a Polycrystalline Grain Boundary Network
Investigation of Nucleation Mechanisms Associated with Formation of Co-precipitates in Ni-based Superalloys
Kinetic Monte Carlo Simulations of Solute Clustering in Multicomponent Al Alloys
Microstructural Evolution of Nanotwinned Al-Zr Alloy with Significant 9R Phase Stabilization
Microstructure and Tensile Behavior of Nanostructured Gradient TWIP Steel
New Insights into The Effect of Solutes on Twinning in Ti Alloys
New Insights on Deformation Twinning- Mechanisms and Modeling
Phase Transformation Pathways in High Entropy Alloys or Complex Concentrated Alloys mediated by Defects
Pseudo-in situ Characterization of Phase Transformation in an Al-Cu-Mn-Zr Alloy Using Atom Probe Tomography
Pseudoelastic Response of Ion-implanted Nickel-titanium Shape Memory Alloy: Combining Experimentation and Forward Modeling
The Effects of Defect Structure on Transformation Properties in NiTi Alloys for Phase Change Thermal Management Applications
Tuning Fine-scale Alpha Microstructures via Nano-scale Structural and Compositional Non-uniformities in Beta Titanium Alloys
Twin Boundaries Continue to Surprise Us: Understanding Type II Twin in NiTi and {1012} Twin in HCP Materials

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