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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Thermal and Mechanical Stability of Nanocrystalline Materials
Presentation Title Design Tough Nanoceramics by Reducing Grain Boundary Energy
Author(s) Ricardo H. R. Castro
On-Site Speaker (Planned) Ricardo H. R. Castro
Abstract Scope Nanocrystalline ceramics show attractive properties in terms of superior hardness and strength. However, the lack of active energy absorbing mechanisms at low temperature causes those superstrong nanoceramics to show low fracture toughness. Cracks are observed to propagate through the grain boundaries (GBs), that in these systems account for a large fraction of the atomic volume. GBs intrinsically present unsatisfied chemical bonds, resulting in weak resistance for crack propagation. In truth, GB energy finds an inverse relation with interfacial bonding strength, such that a lower energy GB shall reflect stronger local bonds. In this work, we exploit the theory of GB energy reduction by solute excess to lower the excess energies in nanocrystalline zirconia. We demonstrate that the addition of La lowers the energies due to segregation, while minimizing the energy dispersion when comparing the different existing GBs. This causes cracks to be more effectively deflectedm significantly increasing toughness.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Microstructural Approach toward Improving the Nano Grain Size Stability of Fe14Cr4Hf Alloy
An Atom Probe Tomography Prospective to Nanogranular Thermal Stability
Atom Probe Tomography Investigation of Diamantane Induced Stability in Nanocrystalline Aluminum
Commonalities in the Structure and Plastic Deformation in Disordered Materials and Interfaces
Connecting Thermal Stability to Fatigue and Wear Resistance in Nanocrystalline Binary Alloys
Control of Thermal Expansivity in Electroformed Fe-Ni Alloys for the Fine Metal Mask
Design Tough Nanoceramics by Reducing Grain Boundary Energy
Effect of Nanoscale Oxide Dispersion on Thermal Stability of Severely Deformed Fe-Y Alloy
Effect of Temperature on the Deformation Response of Grain Boundary Networks
Effects of Nanotwinning and Nanocrystallinity on the Precipitation Behavior of a Ni-Mo-Cr Superalloy
Exploring the Thermal Evolution of Nanomaterials: From Nanometallic Multilayers to Nanostructures
Grain Boundary Phase Transformations and their Impact on Thermodynamics and Kinetics
Grain Boundary Phases and their Thermal Stability
Grain Boundary Stability Governs Hardening and Softening in Extremely-fine Nano-grained Metals
Grain Boundary (GB) Complexions: From Developing GB 'Phase' Diagrams to Understanding Embrittlement and Stabilizing Nanoalloys
Impact of Segregation on Grain Boundary Motion
In-situ TEM Study of the Effects of W Solutes on Irradiation Induced Detwinning in Cu
Initiation and Stagnation of Room-temperature Strain-induced Grain Coarsening in Thin Au Films
Insights from Variable Temperature and Ultra-high Strain Rate Nanomechanical Testing of Model Nanocrystalline and Nanocomposite Materials Realized by Either Inert Gas Condensation or Alternating Atomic Layer Deposition, Sputtering and Inert Gas Condensation of Nanoparticles
Insights into Deformation Induced Grain Boundary Migration in Ultrafine-grained Metals from a Strain Path Change – Does Texture Play a Role?
Interfaces in HCP/BCC Structural Nanocomposites
Investigating the Thermal Stability of FCC and BCC Nanocrystalline Thin Films by In Situ TEM Annealing and Post Mortem TKD Analysis
Irradiation Creep in Nanostructures Measured Using In-situ TEM
Mechanical and Thermal Stability of Nanocrystalline High-entropy Alloys
Mesoscale Modeling of Grain Boundary Segregation: The Role of Anisotropy in Segregation
Microstructure Characterization and Mechanical Properties of Nanostructured Low Activation Steel Produced by Surface Mechanical Attrition Treatment
Modulating Stability and Strength in Nanocrystalline FCC Metals: The Effects of Microstructure, Composition and Interfacial Character
Polycrystal Plasticity with Grain Noundary Evolution
Probing the Interfacial-driven Radiation Tolerance of Nanocrystalline Metals
Sensitization in Grain Size Gradients – Investigating the Effects of Low Temperature, Long Term Annealing on the Corrosion and Mechanical Response of Nanocrystalline Aluminum Alloys
Stabilization of Nanocrystalline Alloys through the Incorporation of Grain Boundary Complexions
Sub-ablation Femtosecond Laser Processing of Nanocrystalline Alloys
Synthesis, Characterization and Thermal Stability of Nanocrystalline Mg-Zn Thin Films
The Effect of Free Volume and Interfacial Junctions on the Stability of Nanocrystalline Structures
The Influence of Grain Boundary Segregation on the Mechanical Behavior of Nanocrystalline Metals
The Mechanism of Anisotropic Single-crystal Growth in Nanotwinned Copper
The Mechanisms of Thermal Stability and Strength of Nanocrystalline Immiscible Alloys
The Role of Entropy on the Stability of Nanocrystalline Alloys
Thermal Cycling Test of Integrated Fan-out Wafer Level Package with Highly (111)-oriented Nano-twinned Copper
Thermal Stability of Nanocomposite Metals: In Situ Observation of Anomalous Residual Stresses Relaxation during Annealing Under Synchrotron Radiation
Thermal Stability of Thin Ni-Fe Films on Sapphire
Thermomigration of Cu-Sn and Ni-Sn Intermetallic Compounds during Reliability Test in SnAg Solder Joints
Toward Understanding the Factors that Govern the Temperature Dependence of Mobility in FCC Metals

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