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Meeting Materials Science & Technology 2020
Symposium Micro- and Nano-Mechanical Behavior of Materials
Presentation Title Twinning and Detwinning in Small-sized Crystals
Author(s) Xiang Wang, Scott X. Mao
On-Site Speaker (Planned) Xiang Wang
Abstract Scope Twinning is not only a basic deformation model but also can act as an effective way to improve the mechanical property of materials. However, Twinning is hardly activated in body-centered cubic (Bcc) metals under room temperature and slow strain rates. Here, by performing in situ high-resolution transmission electron microscopy (HRTEM), we found that a majority of deformation twins in Bcc metals are unstable and undergo spontaneously detwinning upon unloading, in stark contrast to those in most Fcc metals. Such unexpected instability of Bcc twins was associated with the prevalence of the inclined twin boundaries—a peculiar structure where twin boundaries are not parallel to the twinning plane, and the degree of instability is in direct proportion to the fraction of the inclined twin boundary. This work provides significant insights into the structure and stability of deformation twins in Bcc metals.

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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