Time for some quick notes!

Got to meet many old acquaintances and friends — Prof. Ranganathan, Srinivasarao Bakshi, Indarjit, Raju Ramanujan — as well as some people whose papers I have read but haven’t met till now — Ken Elder, Jim Warren, and Jonathan Guyer. Had been chatting with people mostly and had a quick lunch of Greek salad, fruit salad and chips. Time to go for the sessions in which mine is scheduled. In the meanwhile, here are the notes from a couple of talks I attended in the morning:

Pascal Bellon — Phase field modelling for irradiated systems

Radiation — elementary effects
— permanent point defects
— displacement cascade
— relocation of atoms

Length scale — cascade size — 1 to 10 nm
Fluctuations — point defect cluster size

Length scale — average relocation distance — 1 to 10A
Fluctuations — displacement cascade size

Ballistic effects — using PFM

Enrique et al PRL 2000 — 1 D PFM — to show compositional patterning — Finite range mixing

PRB — 2001 — MC to indicate the correctness of PFM

A field variable for defects — mixed: discrete (cluster size)–continuous (defects)

Stress fields — Bulatov, LANL

Erik Lauridsen — X-Ray micro tomography

beta–21S — metastable beta phase — Transforms to alpha (laths)

Alpha decorates the grain boundaries first and moly segregates to alpha and it is a heavy element so that X-ray might work well

Precipitation dynamics in Timetal beta21S

Tomography + EBSD for orientation

Alpha lath on a single boundary can have sections with one orientation corresponding to one of the grains and the rest another corresponding to the orientation of the second grain — in 3D, the grain facet is a shallow v.

Low index grain boundary orientation is what the nucleating alpha prefers

300 micron dia can what be imaged with X-rays

Diffraction contrast tomography to get both shape, location and orientations

Jonathan Guyer — phase field modelling of electrochemical systems

Phys Rev 2004

Problems — Debye Length and jumps in concentration

Scharfetter-Gummel interpolation

Moving mesh — not worth

Adaptive meshing — not worth

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