This paper presents a systematic approach to treating the interfaces between the localized (fine grain) and peripheral (coarse grain) domains in atomic scale simulations of crystalline solids. Based on Fourier analysis of regular lattices structures, this approach allows elimination of unnecessary atomic degrees of freedom over the coarse grain, without involving an explicit continuum model for...

The grain boundary character distribution (GBCD) of a fully-orthorhombic (O) Ti–25Al–24Nb (at.%) microstructure was investigated using electron backscatter diffraction (EBSD). The fine-grained (GS=17 lm) equiaxed microstructure was processed by hot forging and hot-rolling operations performed below the body-centered cubic (bcc) phase transus temperature followed by heat treatment in the O-phase...

Systematic experiments have been performed to investigate the rate sensitivity of deformation in fully dense nanocrystalline Ni using two different experimental techniques: depth-sensing indentation and tensile testing. Results from both types of tests reveal that the strain-rate sensitivity is a strong function of grain size. Specifically microcrystalline and ultra-fine crystalline pure Ni, wi...

This paper presents an investigation on the microstructure and property of 4043 Al-alloy parts built using a novel layer-deposition technique based on a variable polarity gas tungsten arc welding (VP-GTAW) process. Processing parameters strongly affect the geometry, microstructures, roughness, and hardness of a deposited part. A hollow cylindrical part with 120 layers is built up with a good su...

An alloy can be created without melting, by violently deforming mixtures of different powders. As first discovered by Benjamin, inert oxides can also be introduced into the microstructure using this technique. The resulting dispersion-strengthened alloyed powders are then consolidated using hot-isostatic pressing and extrusion, to produce a solid with a very fine grain structure on a sub-microm...

This article describes the four systems sent by the author to the SENSEVAL-3 contest, the English lexical sample task. The best recognition rate obtained by one of these systems was 72.9% (fine grain score) .

In this document we describe our work-in-progress for enabling fine-grain authorization of resource management. In particular we address the needs of Virtual Organizations (VOs) to enforce their own polices in addition to those of the resource owners.