|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||Deformation at a single precipitate using a nanocube model system
||Wendy Gu, Mehrdad Kiani, Mitsu Murayama
|On-Site Speaker (Planned)
Understanding deformation at nano-precipitates is critical to the design of next-generation alloys. The theory of precipitate hardening is based on the interaction of dislocations with ensembles of precipitates. It has been challenging to study the mechanical behavior of dislocations at an individual precipitate experimentally, but is important for the predictive modeling of precipitate strengthened systems. Here, we look study the mechanical behavior of metallic nanocubes that contain individual precipitates with well-defined size, shape and interfacial dislocations. Colloidal synthesis is used to create bimetallic Au@Cu core-shell nanocubes with overall size of ~60-100 nm, and precipitate size of 14 and 24 nm. Nanocubes are compressed inside of a SEM to obtain stress-strain behavior. TEM strain mapping is used to characterize the region around the precipitate. Au@Cu core-shell nanocubes are found to have higher strength, and pronounced strain hardening that we relate to Orowan looping, Orowan stress, back stress and image stress.
||Mechanical Properties, Nanotechnology, Copper / Nickel / Cobalt