Method for preparing polycrystalline structures having...

C - Chemistry – Metallurgy – 25 – D

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C25D 5/50 (2006.01)

Patent

CA 2674403

Polycrystalline materials are prepared by electrodeposition of a precursor material that is subsequently heat-treated to induce at least a threefold increase in the grain size of the material to yield a relatively high fraction of 'special' low .SIGMA. grain boundaries and a randomized crystallographic texture. The precursor metallic material has sufficient purity and a fine-grained microstructure (e.g., an average grain size of 4 nm to 5 µm). The resulting metallic material is suited to the fabrication of articles requiring high mechanical or physical isotropy and/or resistance to grain boundary-mediated deformation or degradation mechanisms.

Les substances polycristallines sont préparées par électrodéposition d'un matériau précurseur qui est par la suite traité par la chaleur pour induire au moins un triplement de la grosseur de grain du matériau pour produire une fraction relativement élevée de joints 'spéciaux' de grain de faible .SIGMA. et une texture cristalline aléatoire. Le matériau métallique précurseur possède une pureté suffisante et une microstructure à grain fin (par ex., une grosseur moyenne de grain de 4 nm à 5 µm). Le matériau métallique résultant est adapté à la fabrication d'articles requérant une isotropie et/ou une résistance mécanique ou physique élevée aux mécanismes de dégradation ou de déformation dus aux joints de grain.

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