|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Shear Deformation-induced Modification of Defect Structures and Hierarchical Microstructures in Metallic systems
||Bharat Gwalani, Matthew Olszta, Miao Song, Wenkai Fu, Yulan Li, Qin Pang, Anqi Yu, Mayur Pole, Jia Liu, Joshua Silverstein, Xiaolong Ma, Tanvi Anjantiwalay, Aashish Rohatgi, Mert Efe, Peter Sushko, Arun Devaraj, Ayoub Soulami, Suveen Mathaudhu, Cynthia Powell, Lei Li
|On-Site Speaker (Planned)
Deformation-induced microstructural modification is used in several advanced materials' processing methods such as friction-stir-based processing, welding, or additive manufacturing. In these processes, the mechanical-thermal coupling obscures a deep mechanistic understanding of microstructural evolution, and the knowledge of how these microstructures influence mechanical properties is in its nascency. We highlight the influence of high strain deformation on the microstructural hierarchy and mechanical properties of binary alloys such as Al-Si, Cu-X (X = Nb, Cr, or Ni). Our studies show that deformation-induced grain refinement, multiscale fragmentation, and metastable solute saturated phases with distinctive defect structures lead to a significant increase in the flow stresses measured via micropillar compression. Our results highlight that shear deformation during solid-phase processing can achieve persistent metastable microstructures with enhanced mechanical properties with deformation-dependent solute miscibility. The experimental insights obtained here are crucial for developing atomic to mesoscale models for microstructural evolution under high strain deformation.
||Characterization, Phase Transformations, Shaping and Forming