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Meeting Materials Science & Technology 2020
Symposium Micro- and Nano-Mechanical Behavior of Materials
Presentation Title Temperature-dependent Intermittent Plasticity of Nb Microcrystals
Author(s) Quentin Rizzardi, Douglas Stauffer, Jaime Marian, Robert Maass
On-Site Speaker (Planned) Robert Maass
Abstract Scope Intermittent microplasticity via dislocation avalanches indicates scale-invariance, which is a paradigm shift away from traditional bulk deformation. Recently, we have developed an experimental method to trace the spatiotemporal dynamics of correlated dislocation activity (dislocation avalanches) in microcrystals (Phys. Rev. Mat. 2 (2018) 120601; Phys. Rev. Mat. 3 (2019) 080601). Here we exploit the temperature sensitive deformation of bcc metals. A marked change of the slip-size distribution is observed in the studied microcrystals, with increasingly small event-sizes dominating with decreasing temperature. This shows how a reduction in thermal energy increasingly suppresses the length-scale of dislocation avalanches, indicating how long-range correlations become gradually limited to the scale of the lattice. Our results further show that the stress-strain response is composed of strain-increments that are either thermally activated or essentially athermal. Temperature-dependent small-scale testing in combination with state-of-the-art discrete dislocation dynamics (DDD) simulations of Nb microcrystals are used to reveal these insights.


An Integrated In Situ Solution for Automated Material Testing in SEM
Atomistic Simulations of Collisions between SiC Nanoparticles
Characterization of Dislocation Avalanches by In Situ Micropillar Compression Tests with Simultaneously Detected Acoustic Emission
Characterization of Electroless Copper Deposits on Electrospun PAN Fibers in Aligned and Random Configurations
Characterization of Fatigue Damage Behavior in Unidirectional Carbon Fiber Reinforced Plastic Laminates
Computer Vision Approach to Study Surface Deformation of Materials
Cyclo[18]carbon as an Ultra-flexible Material
Diffusion Induced Abnormal Softening Behaviors in Nanocrystals
Effects of Testing Temperature and Sample-size on Tensile Deformation of Metallic Glass
Exploring Small-scale Quasicrystal Plasticity in Unknown Temperature Regimes and Compositions
Gradatim Ferociter: Exploring the Grain Size Stability of Heterogeneous Copper in Thermal, Mechanical and Radiation Environments
In Situ Nanomechanical Testing of Piezoresistive Materials
In Situ Nanomechanics of Ni-based Superalloys and Bond Coating: Effect of Temperature
Introductory Comments: Micro- and Nano-Mechanical Behavior of Materials
Mechanical Behavior of Resilin-mimicking Materials
Mechanical Properties of Hybrid Core-shell Ceramic Nanoparticles
Microparticle Impacts at Supersonic Speeds, and the Role of Surface Layers
Persistent, Inelastic Cycling Behavior in Rare Earth Orthophosphate Ceramics
Processing, Characterization, and Modeling of Nano-twinned Alloys: Understanding the Role that Controlling and Tuning of Microstructure has in Dislocation-twin Interactions
Quantitative Evaluation of Large Nanoindentation Data Sets
Small-Scale Mechanical Behavior of Ion-irradiated Amorphous Metals versus Multi-Principal Alloys
Spatial-temporal Investigation of Shear Bands in Bulk Metallic Glasses
Temperature-dependent Intermittent Plasticity of Nb Microcrystals
Time-resolved Atomic-scale Observations of Deformation and Fracture of Nanostructured Materials
Twinning and Detwinning in Small-sized Crystals

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