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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Heterostructured and Gradient Materials (HGM V): New Mechanistic Discoveries Enabling Superior Properties
Presentation Title Design of Heterostructured High Entropy Alloys for Superior Mechanical Properties at Cryogenic-to-ambient Temperatures
Author(s) Cheng Zhang, Enrique Lavernia
On-Site Speaker (Planned) Enrique Lavernia
Abstract Scope The highly tunable properties of high-entropy alloys (HEAs) provide extraordinary potential for critical structural applications, especially under extreme conditions. However, it is still a challenge for HEAs to achieve ultrahigh engineering tensile strength over 2 GPa with reasonable ductility. Here, with the introduction of heterogeneous microstructure, we report on a FeNiCoAl-based HEA that can show a superb combination of mechanical properties at cryogenic-to-ambient temperatures. Experimental results, obtained from TEM, TEM-based PED, and EBSD, demonstrate that the heterogeneous microstructure triggers high hetero-deformation induced hardening and facilitates the accumulation of dislocations. The macroscopic “loading-unloading-reloading” cyclic tensile tests confirm that hetero-deformation induced hardening plays a significant role in strengthening the alloy during deformation. Details about the difference in the sequence of phase transformation in fine grains and coarse grains caused by heterogeneity will be shown. The strategy for designing heterostructured HEAs with ultrahigh strength-ductility synergy will also be presented.
Proceedings Inclusion? Planned:
Keywords Mechanical Properties, Phase Transformations, High-Entropy Alloys

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Application of Harmonic Structure Design to a CrMnFeCoNi High Entropy Alloy
Constitutive Model and Finite Element Analysis of Heterostructured Materials
Defect-interface Interactions and Nanomechanical Behavior of 3D interfaces in Ti/Nb Nanolaminates
Deformation Domains in Heterogeneous Nanostructured Inconel
Deformation Mechanisms in Laser Processed Nano-eutectics
Design of Heterostructured High Entropy Alloys for Superior Mechanical Properties at Cryogenic-to-ambient Temperatures
Designing Materials with Heterogeneous Microstructure via Additive Manufacturing
Effect of Grain Refinement on Plastic Deformation and Fracture in a Si-added High-Mn Austenitic Steel
Gradient Bulk Nanostructures with Exceptional Strength via High Load Sliding
Heterogeneous Microstructure Driven Strength-ductility Synergy in Laser Powder Bed Additively Manufactured Alloys
High Strength and Ductility in a Heterostructured Nanotwinned Ni Film
Improving Local Fracture Properties of W-CuZn Nanocomposites by Microstructure Tailoring
In Situ Pillar Compression to Understand Dislocation-grain Boundary Interactions in Cu
Influence of Strain Gradients in Heterostructured Nanomaterials
L-47-Invited Poster: Chemically-induced Gradient Nanostructures
L-48: Mechanical Properties and Microstructural Evolution of High-pressure Torsion-processed Al7068 Alloy
L-49: Microstructures and Nanomechanical Behavior of Laser Processed Sr-modified Al-Si Eutectic
L-50: Towards a Novel Approach for Integrating Tungsten and Reduced Activation Ferritic Martensitic Steel for Fusion Reactors
Mechanical Anisotropy Effects on Strength and Deformability in Nanolaminates Containing 3D Interfaces
Mechanics of Extremely Heterogeneous Materials
Modeling of Back Stresses in Additively Manufactured Stainless Steel
Multiscale and Hierarchical Laminated Steel Structures with Superior Strength-ductility Synergy via Additive Manufacturing
Progress in Heterostructured Materials
Quasi-static and Dynamic Mechanical Behavior of Metal Composites with Co-continuous Phase Distributions
Significant Bauschinger Effect and Back Stress Strengthening in an Ultrafine Grained Pure Aluminum Fabricated by Severe Plastic Deformation Process
Strain-dependent Phase Transformation Mapping of Diffusion-bonded Nanocrystalline Aluminum-magnesium by High-energy Synchrotron X-rays
Strengthening Mechanisms in a Heterostructured and Antimicrobial Stainless Steel
Strengthening of 3D Printed Cu Micropillar in Cu-Ni Core-shell Structure
Ultrahigh Strength and Strain Localizations in Nanotwinned Ni-Mo-W Alloys
Understanding Interfacial Kinetic Processes during Sintering to Enable Heterostructuring
Work Hardening and Radiation Response of Gradient Alloys

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