Effect of Loading Mode on the Evolution of the Dislocation Structure in Magnesium

Abstract

The evolution of the dislocation structure in randomly textured cast magnesium as a function of loading mode is studied using whole neutron diraction pattern line prole analysis and elasto-plastic self-consistent modeling. Both the experimental results and the theoretical data indicate the onset of basal slip at low stresses and the key role of prismatic slip in the macroscopic yield. Dependence of the second-order pyramidal slip on the loading mode is revealed.

Elastic Behavior of Nb2O5/Al2O3 Core–Shell Nanowires in Terms of Short-Range-Order Structures

“…These unique properties may arise from the NWs’ large surface area to volume ratio where surface effects, as well as microstructure and spatial confinement of atoms, are crucial/dominant. For example, in terms of their mechanical behavior, they significantly differ from their two- or three-dimensional counterparts. − The addition of a shell material can further tune the performance and functionality of homogeneous NWs. Such heterostructured NWs, that is, core–shell NWs often possess different chemical and physical properties, which may arise from the difference in the strain at the core–shell interface …”

Nonlinear elastic aspects of multi-component iron oxide core–shell nanowires by means of atom probe tomography, analytical microscopy, and nonlinear mechanics

“…[43][44][45] As a consequence, probably due to their extremely small physical size and the high surface-to-volume ratio, the unique physical properties of the NWs have always indicated a signicant difference from that of their 2D (thin lm), or 3D (bulk) counterparts irrespective to the applied experimental methods or computational simulation. [46][47][48][49][50][51][52][53][54][55][56][57][58] In many modern applications that involve larger strains, the deformation becomes inherently nonlinear (geometrical and/or mechanical). [59][60][61] Therefore, to describe complex physical aspects of these materials, appropriate mechanical models are needed while they can open novel pathways to potential applications.…”

Beyond linearity: bent crystalline copper nanowires in the small-to-moderate regime

“…12,[49][50][51][52][53][54] The investigated NWs have been consistently shown to exhibit unique physical properties that are signicantly different to their 2D, thin lm, or 3D, bulk counterparts, probably due to their extremely small physical size and high surface-to-volume ratio. [55][56][57][58][59][60][61][62][63] From a mechanical perspective, the assumption that materials are linearly elastic is successfully used in many engineering applications. For instance, the strain 3 and stress s before yielding was derived from the load-displacement curve obtained from an AFM tip.…”