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Meeting Materials Science & Technology 2020
Symposium Micro- and Nano-Mechanical Behavior of Materials
Presentation Title Characterization of Dislocation Avalanches by In Situ Micropillar Compression Tests with Simultaneously Detected Acoustic Emission
Author(s) Dávid Ugi, Péter Dusán Ispánovity, Michal Knapek, Kristián Máthis, Zoltán Dankházi, István Groma
On-Site Speaker (Planned) Dávid Ugi
Abstract Scope In the size regime around few µm the plastic deformation of single crystals becomes inhomogeneous and unpredictable. Therefore, it is necessary to provide an in-depth experimental investigation of these elementary deformation processes. In my talk, I will show experimental results achieved with the combination of two methods: (i) in situ nanoindentation testing used to determine the stress-strain characteristics of micrometer size Zn pillars, and (ii) acoustic emission measurement typically used to monitor plastic activities in bulk materials. The nanoindentation experiment was carried out in a SEM while a piezoelectric detector was attached to the sample. Our simultaneous measurements show real correlation between the dislocation avalanches associated with the measured stress drops and the detected acoustic signals. The statistical analysis of the sequence of acoustic signals reveals long-range temporal correlations and a complex internal structure of a single event and, thus, opens new perspectives in the interpretation of the acoustic signals.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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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