| Abstract Scope |
Gradient nanotwinned (GNT) Cu is a prominent class of heterogeneous structured metals, demonstrating superior strengths by gaining extra strengths compared to non-gradient counterparts. Its layered gradient structure provides a simplified quasi-one-dimensional model system for understanding the extra strengthening effects of structural gradients and resulting plastic strain gradients. This talk will present a comprehensive report for recent experimental and modeling studies on the mechanics of GNT Cu, covering advances in controlled material processing, back stress measurement, deformation field characterization, dislocation microstructure analysis, and strain gradient plasticity modeling. These studies unveil the spatiotemporal evolution of both plastic strain gradients and extra back stresses originating from structural gradients. Finally, we provide an outlook on research needs for understanding the mechanics of gradient nanostructured metals and, more broadly, heterogeneous structured metals, towards achieving exceptional mechanical properties. |