Classical Hall–Petch relation for large grained polycrystals is usually derived using the
model of dislocation pile-up first investigated mathematically by Nabarro and coworkers. In …

Metals with nanocrystalline grains have ultrahigh strengths approaching two gigapascals.
However, such extreme grain-boundary strengthening results in the loss of almost all tensile …

Nanoindentation experiments are widely used for assessing the local mechanical properties
of materials. In recent years some new exciting developments have been performed for also …

Overcoming the trade-off between strength and ductility in metallic materials is a grand
challenge. Recently, materials with a gradient nano-grained (GNG) surface layer adhering to …

A nanoindentation strain-rate jump technique has been developed for determining the local
strain-rate sensitivity (SRS) of nanocrystalline and ultrafine-grained (UFG) materials. The …

Gradient nanotwinned (GNT) Cu, composed of various homogeneous nanotwinned (HNT)
components, successfully achieves the synergistic enhancement of strength and ductility …

Page 1 Ulrich Messerschmidt SPRINGER SERIES IN MATERIALS SCIENCE 129 Dislocation
Dynamics During Plastic Deformation Extra Materials extras.springer.com Springer Page 2 …

The strain-rate sensitivity of ultrafine-grained aluminum (Al) and nanocrystalline nickel (Ni) is
studied with an improved nanoindentation creep method. Using the dynamic contact …

A model is presented where the properties of ultrafine-grained (UFG) materials are
explained in terms of the influence of high-angle boundaries on the rates at which …

In this work a new ultra-high temperature (UHT) nanoindentation system for testing at up to
1100° C is presented. The system is capable to perform indents from small scale up to large …