|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||Extreme Shear-Deformation-Induced Modification of Defect Structures and Hierarchical Microstructure in Immiscible Alloy
||Bharat Gwalani, Matthew Olszta, Anqi Yu, Krassimir Bozhilov, Soumya Varma, Siddhartha Pathak, Aashish Rohatgi, Suveen Mathaudhu, Peter Sushko, Cynthia Powell, Arun Devaraj
|On-Site Speaker (Planned)
Extreme shear deformation is used for material processing methods and is unavoidable in many engineering applications in which two surfaces are in relative motion against each other while in physical contacts, such as in ball bearings. The mechanistic understanding of the microstructural-evolution of multi-phase metallic systems under extreme shear deformation is still in its infancy. Here, we highlight the influence of shear deformation on the microstructural hierarchy & mechanical properties of binary as-cast Al-xSi & Cu-xNb alloys. Shear-deformation-induced grain refinement, multiscale fragmentation, and metastable solute saturated phases with distinctive defect structures led to a two-fold increase in the flow stresses determined by micropillar compression testing. These results highlight that shear deformation during solid-phase processing can achieve non-equilibrium microstructures with enhanced mechanical properties in these immiscible alloys. The experimental insights obtained here are especially crucial for developing atomic-scale predictive models for microstructural evolution of metallic alloys under extreme shear deformation.
||Shaping and Forming, Characterization, Mechanical Properties