Solid state processing of materials through friction stir...

B - Operations – Transporting – 23 – K

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B23K 31/02 (2006.01)

Patent

CA 2560053

Solid state processing is performed on a workpiece (16) by using a tool (10) capable of friction stir processing, friction stir mixing, or friction stir welding, wherein solid state processing modifies characteristics of a workpiece while substantially maintaining a solid phase in some embodiments, allowing some elements to pass through a liquid phase in other embodiments, and wherein modified characteristics of the material include, but are not limited to, microstructure, macrostructure, toughness, hardness, grain boundaries, grain size, the distribution of phases, ductility, superplasticity, change in nucleation site densities, compressibility, expandability, coefficient of friction, abrasion resistance, corrosion resistance, fatigue resistance, magnetic properties, strength, radiation absorption, and thermal conductivity.

Selon cette invention, un traitement à l'état solide est effectué sur une pièce au moyen d'un outil capable de traitement par friction malaxage, de mélange par friction malaxage ou de soudage par friction malaxage. Le traitement à l'état solide modifie les caractéristiques d'une pièce tout en maintenant sensiblement une phase solide dans certains modes de réalisation, ce qui permet que certains éléments passent à travers une phase liquide dans d'autres modes de réalisation. Des caractéristiques modifiées du matériau comprennent, mais pas exclusivement, la microstructure, la macrostructure, l'endurance, la dureté, le joint de grain, la taille de grain, la distribution des phases, la ductilité, la superplasticité, le changement de densités de site de nucléation, la compressibilité, l'extensibilité, le coefficient de friction, la résistance à l'abrasion, la résistance à la corrosion, la résistance à la fatigue, les propriétés magnétiques, la résistance mécanique, l'absorption du rayonnement et la conductivité thermique.

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