Nanoindentation responses near single grain boundaries in oxide ceramics

Grain boundary segregation in oxide ceramics

D PR O Abstract The factors which control grain boundary segregation in oxide ceramics are reviewed. These include grain boundary energy, cation–cation interactions, impurity cation size, as well as electrostatic interactions with the grain boundary space charge. In addition, an approach for measuring grain boundary segregation in those materials, as a function of the five macroscopic parameter...

Nanoindentation Induced Deformation Near Grain Boundaries of Corrosion Resistant Nickel Alloys Citation

The damage accumulation behavior of different grain boundary structures in Inconel 690 (Ni-29wt%Cr-9wt%Fe) was investigated in the presence of large, localized plastic strains induced by nanoindentation. Spatially-resolved hardness was measured as a function of lateral distance from ‘random’ high-angle grain boundaries and twin boundaries. The confinement of induced defects between the indenter...

Dislocations and Grain Boundaries in Ceramics and Metals

This paper is offered as a tribute to the late Gareth Thomas and the celebration of his career using transmission electron microscopy. His early work on dislocations and twin boundaries in metals suggested indirect methods for determining the stacking-fault energies (SFEs) of Al [1] and Ni [2] and subsequently examined questions on how the measured values of SFEs of copper alloys change when th...

Chemical stability of grain boundaries in β-tricalcium phosphate ceramics

Molecular dynamics simulations of nanoindentation and scratch in Cu grain boundaries

The dynamic nanomechanical characteristics of Cu films with different grain boundaries under nanoindentation and scratch conditions were studied by molecular dynamics (MD) simulations. The type of grain boundary is the main factor in the control of the substrate atoms with respect to the size of dislocations since the existence of the grain boundary itself restricts the movement associated with...