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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advances in Multi-Principal Element Alloys V: Mechanical Behavior
Presentation Title Advanced In-Situ Diffraction Studies on Multi-Principal Element Alloys and Intermetallics
Author(s) Klaus-Dieter Liss
On-Site Speaker (Planned) Klaus-Dieter Liss
Abstract Scope Advanced diffraction techniques using both neutron and high-energy synchrotron radiation provide multidimensional insights into the bulk behavior of alloys under in-situ thermo-mechanical conditions. Neutron diffraction offers statistical averaging over large volumes, capturing orientation distributions and internal strains, while synchrotron diffraction enables grain-resolved analysis through high spatial and angular resolution. Their complementarity enables comprehensive tracking of microstructural evolution. This contribution highlights non-conventional diffraction analysis approaches, including the consideration of primary extinction effects to probe defect kinetics. Grain-resolved spot analysis reveals mechanisms of strain relaxation, recovery, and recrystallization, while anisotropic diffraction patterns provide access to texture and residual stress evolution. Diffuse scattering from single crystals further reveals short-range ordering. Case studies include Multi-Principal Element Alloys such as Medium Entropy Alloys, Refractory Alloys, and Titanium Aluminides. These examples illustrate the power of combined neutron and synchrotron methods in revealing internal processes that govern mechanical behavior and phase transformations in complex alloys.
Proceedings Inclusion? Planned:
Keywords Characterization, High-Temperature Materials, High-Entropy Alloys

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

3D Atomic-Scale Imaging of Chemical Order and Lattice Distortion in Medium/High-Entropy Nanoalloys
A Perspective on Multiscale Computational Approaches to Understanding Process–Structure–Mechanical Property Relationships in Multi-Principal Element Alloys
A study of ordering in chemically complex alloy CrCoNi using Extended X-ray Absorption Fine Structure (EXAFS) under static diamond anvil cell compression
A study of the active deformation mechanisms in the refractory high entropy alloy Al0.33Mo0.33Nb0.33Ta0.33TiZr
Accelerated MD investigation of screw dislocation strengthening mechanism in BCC Multi-Principal element Alloys
Accelerated screening of composition-structure-property relationships in MPEAs
Accurate Determination of the Deformation Mechanisms in Refractory Compositionally Complex Alloys
Achieving Deformation-Induced Nano-sized Twins and hcp Structures in FCC Complex Concentrated Alloys Under Charpy Impact Testing
Additive Manufacturing: From Complex Alloys to Simple Alloys
Advanced Characterization of Engineering Applications of a Strong and Ductile Medium Entropy Alloy with Known Short-Range Order
Advanced In-Situ Diffraction Studies on Multi-Principal Element Alloys and Intermetallics
Aging-Enhanced Ductility in TiZrNb-O Complex Concentrated Alloys
AI-Enabled Multiscale Design of Ultrastrong Refractory Alloys
Atomic-Level Bonding Control in Multi-Principal Element Alloys: Pathways to Tuning Mechanical Performance and Radiation Behavior
Atomic-level defects on dislocation lines and their role in refractory complex alloy strength
Atomistic Tracking of Self Diffusivity in Multi-Principal Element Alloys
Bi-continuous W-rich Refractory High Entropy Alloy-Cu Composite: Toward material innovation of nuclear reactor coolant system
CALPHAD-Guided Development and Mechanical Evaluation of Dual-Phase CoFeNiVTi Alloys
Combinatorial microstructure & stoichiometry-based and hybrid machine learning & domain knowledge for hardness mapping in a high-entropy alloy
Comparison of NbxMo1-x and (VNbTa)xMo1-x Refractory MPEA Thin Films by In Situ Microcantilever Beam Bending
Complex deformation behavior of a partially recrystallized metastable medium-entropy alloy: In-situ synchrotron X-ray diffraction study
Compositionally Tuned Cryogenic Plasticity in TiZrHf-Based HCP High-Entropy Alloys
Creep behavior of CoCrNi-based alloys
Creep Properties of NbTaTi-Based Refractory High-Entropy Alloys
Data Driven Design for Multicomponent Chemistries with Property Trade-offs
Deformation Characteristics and Phase Transformation in a B2-Base High-Entropy Alloy (HEA)
Design and Development of Lightweight Medium and High-Entropy FeMnAlC Steels
Dislocation Analysis of CrCoNi using Micropillar Experiments and Molecular Dynamics Simulations
Dislocation Properties in Refractory Compositionally Complex Alloys
Dry Sliding Wear of Cu-Alloyed Low-Carbon Steels: Role of Oxides and Quenching Temperature
Ductile-Brittle Transitions in bcc Refractory High-Entropy Alloys
Dynamic properties of NbTaTiHf High-Entropy Alloy
EBSD analysis of microstructure evolution in hot-deformed WMoFeNi MPEA Alloy system
Effect of minor Ge/Mo/W on the corrosive behavior in FCC CoCrFeNi high-entropy alloy
Effect of Mo-addition on fracture behavior and mechanical properties of NbTaTiV-based refractory high-entropy alloys
Effect of Stacking Fault Energy on Mechanical Behavior and Microstructures in High/Medium Entropy Alloys
Evaluation of hydrogen embrittlement of welded metals at 15 K
Evolution of the BCC + B2 microstructure and its high temperature stability in refractory high entropy alloys (INVITED TALK)
Examining the influence of multiphase evolution and elemental partitioning on mechanical behavior in Nb-V-Zr alloys
Excellent tensile properties in a Al0.3CoFeNi High Entropy Alloy attributed to ordering phase transformations
Experimental Study of Corrosion, Wear and Biocompatibility Behavior of Novel Senkov-Derivative Refractory High-Entropy Alloys
Exploiting Process-Structure-Property Relationships for the Accelerated Development of High Entropy Alloys
Exploration of Local Ordering in Multi-Principal Elemental Alloy systems for Nuclear Fusion Applications Through the Use of Total Scattering
Exploring Phase Stability and Deformation Mechanisms in Refractory Compositionally Complex Alloys Across the Compositional Boundary Between Mo–W-Rich and Senkov-Type Alloys
Exploring the Shock Response of Compositionally Complex Alloys
Extreme Tensile Strength of Medium-Entropy Alloys Through Pulsed Lasers
Fatigue-resistant Eutectic High-entropy Alloys (EHEAs) by Additive Manufacturing (AM)
Flipping Weld Performance in Multi-Principal Element Alloys at Cryogenic Temperatures via Multi-Scale Heterogeneity
From High-Entropy Ceramics (HECs) to Compositionally Complex Ceramics (CCCs): Recent Examples of Fluorite-based and Pervoskite Oxides
Grain size dependence of competing deformation mechanisms in a CrCoNi medium entropy alloy
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Harnessing Defects for Enhanced Strength in Medium Entropy Alloys
Heterostructured High Entropy Alloys: Principle and Design
Hierarchical texture with consecutive onset of deformation twinning in CoCrFeMnNi high-entropy alloy
High yield strength and exceptional work hardening in hierarchical-structured high-entropy alloys
Hydrogen-Enhanced Localized Plasticity in Nanoparticle-Reinforced CoCrFeNi Medium-Entropy Alloys
Integration of micromechanical modeling and in situ neutron diffractions for the ductility studies of novel high entropy alloys
Investigating the role of temperature on the mechanical properties of Nanocrystalline Al0.3CoCrFeNi High Entropy Alloy Using Molecular Dynamics Simulations
Kappa-Carbide Precipitation and Hardening Response in Fe–Mn–Al–C-Based Multi-Principal Element Alloys
Machine Learning Prediction of High Order Slip Energetics and Their Effect on Strain Hardening in Refractory High-entropy Alloys
Mapping Deformation Mechanisms in Multi-Phase BCC MPEAs via In-Situ TSEM and 4D-STEM
Martensitic islands in the AlCoNiV multicomponent alloy
Mechanical Behaviors of Multi-Principal Element Alloys via Atomistic Simulations and Machine Learning: Non-Equiatomic HEAs and TRIP-Enabled RHEAs
Metal Nanostructuring by High-Pressure Torsion: Defect-Induced Microstructure Characterization
Micromechanical fracture and strength testing of sputtered high entropy nitrides up to 1000 °C
Microstructural Evolution and Strengthening Mechanisms in Ni₆₃.₂V₃₆.₈ Alloy with Ni₂V Precipitation
Microstructural Study of an Iron-Based High-Entropy Alloy FeMnAlSiCr-C
Mixture density neural networks for phase prediction of Refractory multi-principal-element alloys (RMPEAs) with uncertainty
Modeling and accurate atomistic simulations of solid solution strengthening in Nb45Ta25Ti15Hf15
Modulation of Mechanical Behavior in High-Entropy Nitride Coatings
Multiple precipitates strengthening in FeCoNiV+AlTi complex concentrated alloys with heterogeneous structures
Nanoindentation Responses of Magnesium Lithium Based Alloys
Nanostructures in Multicomponent High-Entropy Cantor Alloys
On the Damage Tolerance of TiZrNbHfTa Refractory High-Entropy Alloys
On the temperature dependence of damage tolerance in bcc refractory medium/high-entropy alloys
Order-disorder transitions of the high-entropy Heusler alloys
Phase and Property Prediction in Multi-Principal Element Alloys for Aerospace Applications Using Data-Driven Approaches
Phase Fraction and Coherency of the B2 Phase on Ductility in Al-containing HEAs
Precipitation Strengthening in BCC Al2.7CrMnTiV Multi-Principal Element Alloys
Predicted Influence of Interfaces on the Thermomechanical Properties of High Entropy Transition Metal Carbides
Predicting intrinsic ductility of refractory alloys from electronic density of states
Quantum Machine Learning Design of Ductile Compositionally Complex Alloys
Rapid On-Demand Synthesis (RODS) of Metallic Structural Materials: An essential capability for HEAs
Recent Advances in Understanding of Deformation Mechanisms in Metastability Engineered Alloys
Response of the Al0.3CoCrFeNi Multi-Principal Element Alloy to Uniaxial Loading and Creep using Crystal Plasticity Finite Element Method.
Rotational deformation twins in a ductile B2-ordered refractory high entropy alloy
Simulations and Modelling of the Mechanical Behavior of Compositionally Complex Concentrated BCC alloys
Slip Resistance and Dislocation Behavior in BCC Refractory Multi-Principal Element Alloys
Spatiotemporal Characteristics of Deformation in FeAlCr-Based Complex Concentrated Alloys Investigated Using In Situ Techniques
Specifically Designed Multi-Principal Alloy Exhibiting Shape-Memory Behavior
Spectroscopic Characterization and Thermodynamic Stability of Femtosecond Laser-Ablated CuCoMn1.75NiFe0.25 Nanoparticles
Strength-Ductility Synergy in Single-Phase FCC Multi-Principal Element Alloys: Multifaceted Strengthening by Ti Addition
Strengthening mechanisms and interfacial cohesion in lamellar-dendritic AlTiCrV0.5Fe0.5 // Ti-6Al-4V hybrid materials
Study on high temperature properties of Nb-controlled refractory high-entropy alloys
Tailored L2₁/B2 Co-Precipitation in BCC Multi-Principal Element Superalloys
Temperature-dependent screw dislocation dynamics on multiple slip systems in MoNbTi refractory multi-principal element alloy
Temperature-dependent strengthening mechanisms in Mn- and Si-alloyed low carbon ferritic steels for cylindrical battery case
Tensile properties of Ti-Zr-Hf-Nb-Ta based refractory high-entropy alloys
Tension-compression asymmetry in HfNbTaTiZr RHEAs studied with in situ neutron diffraction
The Interplay of Anharmonicity and Chemical Order in Governing the Temperature-Dependent Stacking Fault Energetics of CoCrNi
The Nature of a Potential Passive Film on Refractory High Entropy Alloys
Thermodynamics of Mechanical Behavior in R-CCAs: Balancing Room-Temperature Tensile Ductility and High Temperature Strength
Towards the Development of Oxidation-Resistant Refractory High-Entropy Alloys
Tunable energy landscape of screw dislocation cores by compositional fluctuations in bcc high-entropy alloys
Tuning Mechanical Behavior in AlxCoCuFeNi High-Entropy Alloys via Nanolamellar Architectures and Nanoparticle Reinforcement
Understanding cyclic straining induced extraordinary tensile strengthening in an Al0.1CoCrFeNi high entropy alloy via in situ neutron diffraction
Understanding Order-Disorder Phase Relations with Mechanical Properties in Refractory High-Entropy Alloys using In-situ Diffraction Techniques
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Unlocking Superior Mechanical Performance in CoNi-Based Medium Entropy Alloys
Unraveling Cryogenic Deformation Mechanisms in Multi-Element Alloys
Unraveling Temperature-Dependent Dislocation Mechanisms in MoNbTaWV via Machine Learning Interatomic Potentials
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(Invited) In situ synchrotron x-ray diffraction characterizations of deformation mechanisms of additively manufactured medium entropy alloys
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