Christopher R. Weinberger
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View article: Designing phase‐adaptive UHTC multilayer composites: Layer width effects on mechanical and kinetic properties
Designing phase‐adaptive UHTC multilayer composites: Layer width effects on mechanical and kinetic properties Open
The B1 rocksalt transition metal carbides and nitrides are among the materials with the highest melting temperatures. Additionally, members of this group of materials possess high‐temperature strength with ductility facilitated by diffusio…
View article: First‐principles investigation of the anomalous carbon diffusion in TiC<sub>0.67</sub>
First‐principles investigation of the anomalous carbon diffusion in TiC<sub>0.67</sub> Open
In this work, we address a long‐standing question about the link between vacancy order–disorder transitions and carbon diffusion activation energy in substoichiometric titanium carbide. This is accomplished using Monte Carlo and kinetic Mo…
View article: The effects of surface kink nucleation on the dislocation mobility for bcc metals: a kinetic Monte Carlo study
The effects of surface kink nucleation on the dislocation mobility for bcc metals: a kinetic Monte Carlo study Open
Dislocation plasticity in bcc metals at low temperatures and stresses is well known to be controlled by screw dislocation mobility. Screw dislocations move by the nucleation of kink-pairs on the dislocation line and is a relatively well st…
View article: Insights into the anomalous hardness of the tantalum carbides from dislocation mobility
Insights into the anomalous hardness of the tantalum carbides from dislocation mobility Open
View article: Insights into the soft brittle-to-ductile transition from discrete dislocation dynamics
Insights into the soft brittle-to-ductile transition from discrete dislocation dynamics Open
View article: The effects of vacancy ordering on diffusion: a statistical study
The effects of vacancy ordering on diffusion: a statistical study Open
In this paper we investigate the interconnection between vacancy-ordered phases and vacancy self-diffusion. Here, we investigate three ordered phases on a square lattice with energetics defined by two separate Hamiltonians. In the first ca…
View article: The “Overlooked” Entropy and the Associated Role of Phonons in the Mixing Stabilization for Complex Ceramics
The “Overlooked” Entropy and the Associated Role of Phonons in the Mixing Stabilization for Complex Ceramics Open
The concept of high entropy materials has been introduced based on the idea that multiple principal components can be mixed through the increase in configurational entropy. Implicit in this idea is that the vibrational entropy, the other c…
View article: Exploring fracture anisotropy in tantalum carbide compounds: A density functional theory approach
Exploring fracture anisotropy in tantalum carbide compounds: A density functional theory approach Open
In this paper, we examine the cleavage fracture anisotropy in tantalum carbides, namely, TaC, α‐Ta 2 C, and ζ‐Ta 4 C 3 − x , using density functional theory (DFT) calculations. Our investigation identifies the presence of multiple low‐ener…
View article: Rapid microcantilever preparation for conditional fracture toughness evaluation
Rapid microcantilever preparation for conditional fracture toughness evaluation Open
View article: Understanding the Physics Associated with the Thermally Activated Nature of the Soft Brittle-to-Ductile Transition
Understanding the Physics Associated with the Thermally Activated Nature of the Soft Brittle-to-Ductile Transition Open
View article: Rapid Microcantilever Preparation for Conditional Fracture Toughness Evaluation
Rapid Microcantilever Preparation for Conditional Fracture Toughness Evaluation Open
View article: Understanding the Physics Associated with the Thermally Activated Nature of the Soft Brittle-to-Ductile Transition
Understanding the Physics Associated with the Thermally Activated Nature of the Soft Brittle-to-Ductile Transition Open
View article: Design of smart transforming metal ceramic multilayers
Design of smart transforming metal ceramic multilayers Open
Novel metal ceramic multilayer composites with the ability to phase transform into a single phase ultra-high temperature ceramic are described. These materials offer enhanced low-temperature fracture toughness and reliability without sacri…
View article: Hydrogen diffusion and storage in substoichiometric TiC
Hydrogen diffusion and storage in substoichiometric TiC Open
View article: Modeling the diffusion-controlled phase transformations in transition metal carbide multilayer composites
Modeling the diffusion-controlled phase transformations in transition metal carbide multilayer composites Open
The kinetics of the carbon-diffusion-controlled Me/MeC phase transformation in transition metal carbide metal ceramic multilayer composites were investigated using mesoscale and continuum level modeling. To track the metal-ceramic interfac…
View article: The effects of mixing non-metal atoms in the B1 structured transition metal carbo-nitrides on their structure and mechanical properties: HfC1-N
The effects of mixing non-metal atoms in the B1 structured transition metal carbo-nitrides on their structure and mechanical properties: HfC1-N Open
In this paper, we utilize density functional theory to explore how alloying the carbide and nitride of a group IVB transition metal affects the phase stability and mechanical properties; we place an emphasis on elastic and dislocation prop…
View article: <i>In Situ</i> Atomic-Scale Observation of 5-Fold Twin Formation in Nanoscale Crystal under Mechanical Loading
<i>In Situ</i> Atomic-Scale Observation of 5-Fold Twin Formation in Nanoscale Crystal under Mechanical Loading Open
A 5-fold twin is usually observed in nanostructured metals after mechanical tests and/or annealing treatment. However, the formation mechanism of a 5-fold twin has not been fully elaborated, due to the lack of direct time-resolved atomic-s…
View article: Modeling the Diffusion-Controlled Phase Transformations in Transition Metal Carbide Multilayer Composites
Modeling the Diffusion-Controlled Phase Transformations in Transition Metal Carbide Multilayer Composites Open
View article: Simulating dislocation plasticity in BCC metals by integrating fundamental concepts with macroscale models.
Simulating dislocation plasticity in BCC metals by integrating fundamental concepts with macroscale models. Open
View article: Hydrogen trapping and storage in the group IVB-VIB transition metal carbides
Hydrogen trapping and storage in the group IVB-VIB transition metal carbides Open
View article: Basal dislocations in MAX phases: Core structure and mobility
Basal dislocations in MAX phases: Core structure and mobility Open
The MAX phases, layered ternary carbides and nitrides, plastically deform via exclusively basal slip systems. This constraint leads to their well-documented plastic anisotropy and deformation mechanisms such as kinking. Basal dislocations …
View article: Long-range hydrogen-binding effects of carbide interfaces in iron
Long-range hydrogen-binding effects of carbide interfaces in iron Open
A micromechanics model was developed to evaluate the elastic binding energy between carbide precipitates and hydrogen interstitials using Eshelby's equivalent inclusion method. In this work, density functional theory (DFT) simulations were…
View article: Carbide Nanoparticle Dispersion Techniques for Metal Powder Metallurgy
Carbide Nanoparticle Dispersion Techniques for Metal Powder Metallurgy Open
Nanoparticles (NP) embedded into a matrix material have been shown to improve mechanical properties such as strength, hardness, and wear-resistance. However, the tendency of NPs to agglomerate in the powder mixing process is a major concer…
View article: Uniaxial compression of [001]-oriented CaFe2As2 single crystals: the effect of microstructure and temperature on superelasticity Part II: Modeling
Uniaxial compression of [001]-oriented CaFe2As2 single crystals: the effect of microstructure and temperature on superelasticity Part II: Modeling Open
View article: Uniaxial compression of [001]-oriented CaFe2As2 single crystals:the effects of microstructure and temperature on superelasticity Part I: Experimental observations
Uniaxial compression of [001]-oriented CaFe2As2 single crystals:the effects of microstructure and temperature on superelasticity Part I: Experimental observations Open
View article: Understanding the Fundamentals of Plastic Deformation.
Understanding the Fundamentals of Plastic Deformation. Open
View article: PPM: Nanoscale Origins of Plasticity in Ta.
PPM: Nanoscale Origins of Plasticity in Ta. Open
View article: Uniaxial Compression of [001]-Oriented CaFe <sub>2</sub>As <sub>2</sub> Single Crystals: The Effects of Microstructure and Temperature on the Superelasticity, Part I: Experimental Observations
Uniaxial Compression of [001]-Oriented CaFe <sub>2</sub>As <sub>2</sub> Single Crystals: The Effects of Microstructure and Temperature on the Superelasticity, Part I: Experimental Observations Open
View article: Uniaxial Compression of [001]-Oriented CaFe <sub>2</sub>As <sub>2</sub> Single Crystal the Effect of Microstructure and Temperature on Superelasticity
Uniaxial Compression of [001]-Oriented CaFe <sub>2</sub>As <sub>2</sub> Single Crystal the Effect of Microstructure and Temperature on Superelasticity Open
View article: Atomistic investigation into interfacial effects on the plastic response and deformation mechanisms of the pearlitic microstructure
Atomistic investigation into interfacial effects on the plastic response and deformation mechanisms of the pearlitic microstructure Open