Christophe Desrayaud

TL;DR: In this article, a semi-analytical model for friction stir welding is presented, based on the velocity fields classically used in fluid mechanics and incorporating heat input from the tool shoulder and the plastic strain of the bulk material, which can be used to obtain the strains, strain rates, and estimations of the temperatures and micro-hardness in the various weld zones.

TL;DR: In this paper, the effect of temperature and strain rate on the resulting recrystallised grain size was investigated and it was shown that very fine-scale microstructures (i.e. with a mean grain size smaller than 5 μm) can be easily produced by DRX during high-temperature extrusion of the AZ91 alloy.

TL;DR: In this paper, a 2024-T351 aluminium alloy has been friction stir welded and the microstructures investigated and an inner HAZ hardness minimum was a result of an overaged S phase, whereas an outer minimum was due to precipitate dissolution.

TL;DR: A finite element analysis based on the Coupled Eulerian-Lagrangian formulation was developed to predict and quantify the influence of FSW process parameters on the formation and extent of the banded structures.

TL;DR: In this paper, a simple three-dimensional thermomechanical model for friction stir welding (FSW) is presented, based on a combination of fluid mechanics numerical and analytical velocity fields.