"Deformation Mechanisms in Gradient Materials" 

Vaibhav Singh, MSE PhD Candidate 

Advisor: Professor Xinghang Zhang

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ABSTRACT

Gradient structures, inspired by natural materials, have garnered significant interest for their potential to enhance the mechanical performance of metallic materials. Over the past decade, these gradient structured (GS) metals have emerged as a promising solution to optimize strength and ductility. GS metals exhibit a variation in microstructure from the surface to the core, effectively combining hard nanograins with soft coarse grains. This microstructural gradient provides a synergy of strength and ductility, and improves fatigue resistance, fracture toughness, and tribological properties. This review presents a comprehensive analysis of the deformation mechanisms responsible for the superior mechanical performance of GS metals, specifically focusing on grain coarsening, plastic strain gradient, hetero-deformation induced stress, and twinning in copper. The review highlights how these mechanisms contribute to the enhanced mechanical performance of GS metals, providing insights into the design of advanced materials with exceptional properties.