Zhi Zeng

TL;DR: The potential of additive manufacturing to create alloys with unique microstructures and high performance for structural applications is demonstrated, with austenitic 316L stainless steels additively manufactured via a laser powder-bed-fusion technique exhibiting a combination of yield strength and tensile ductility that surpasses that of conventional 316L steels.

TL;DR: The combined experiment and modelling verify the applicability of the classic Griffith theory of brittle fracture to graphene and quantifies the essential fracture properties of graphene and provides mechanistic insights into the mechanical failure of graphene.

TL;DR: In situ high-resolution transmission electron microscopy and atomistic simulations show that twinning is the dominant deformation mechanism in nanoscale crystals of BCC tungsten, and find that the competition between twinning and dislocation slip can be mediated by loading orientation, which is attributed to the competing nucleation mechanism of defects in nanoscope BCC crystals.

TL;DR: In this paper, a crystal plasticity finite element model was proposed to account for grain-size-dependent yield strengths in gradient nano-grained (GNG) metals. And the associated finite element simulations reveal both the gradient stress and gradient plastic strain in the cross section of GNG copper subjected to axial tension.

TL;DR: This work provides mechanistic insights into enhancing the tensile ductility of metallic nanostructures by engineering the internal interfaces and defects by nanomechanical testing and atomistic modeling.