the effect of pre-existing nano sized precipitates on the mechanisms and rate of grain refinement has been investigated during the severe plastic deformation. a binary al–0.2sc alloy, containing coherent al3sc particles, of 3.62 nm in diameter has been deformed by accumulative roll bonding up to 10 cycles. the resulting deformed structures were quantitatively analyzed using electron backscatter...

This paper describes an activity designed for a site of special interest in which clues to its history are gathered as visitors explore the site before interacting with two displays which reveal details of key past events. We investigate a design approach in which electronically tagged paper is used both to weave the visit together and configure the interactive displays so as to provide variabl...

By employing a combination of three-dimensional atom-probe tomography and first-principles calculations, significant qualitative and quantitative differences in solute segregation at coherent and semicoherent interfaces bounding a single θ^{'} precipitate in an Al-Cu-based alloy are found. Qualitatively, localized segregation is observed at the semicoherent interface, whereas delocalized behavi...

Preface Background

Preface Background

There are some precipitates that undergo transition from a coherent to semi-coherent state during growth. An example of such a precipitate in steel is carbide with a NaCl-type structure, such as TiC and NbC. The interface energy between carbide precipitate and iron is obtained via large-scale first-principles electronic structure calculation. The strain energy is estimated by structure optimiza...

This paper introduces a version of MPICH handling efficiently different networks simultaneously. The core of the implementation relies on a device called ch mad which is based on a generic multiprotocol communication library called Madeleine. The performance achieved with tested networks such as Fast-Ethernet, Scalable Coherent Interface or Myrinet is very good. Indeed, this multi-protocol vers...