Ductile metallic glasses

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 45/02 (2006.01)

Patent

CA 2728346

This application deals with glass forming iron based alloys which when pro-duced as a metallic glass or mixed structure comprising metallic glass and nanocrystalline phases, results in extraordinary combinations of strength and ductility. Specifically, high strain up to 97% and high strength up to 5.9 GPa has been measured. Additionally, consistent with the amorphous structure high elasticity up to 2.6% has been observed. Thus, the new alloys developed result in structures and properties which yield high elasticity corresponding to a metallic glass, high plasticity corresponding to a ductile crystalline metal, and high strength as may be observed in nanoscale materials.

La présente invention concerne des alliages à base de fer formant du verre qui, lorsquils sont produits sous forme de verre métallique ou dune structure mixte comprenant du verre métallique et des phases nanocristallines, produisent des combinaisons extraordinaires de résistance et de ductilité. Une contrainte élevée allant jusquà 97 % et une résistance élevée jusquà 5,9 GPa ont notamment été mesurées. En outre, en adéquation avec la structure amorphe, on a observé une élasticité élevée allant jusquà 2,6 %. Les nouveaux alliages développés permettent d'obtenir, de ce fait, des structures et des propriétés qui présentent une haute élasticité correspondant à un verre métallique, une haute plasticité correspondant à un métal cristallin ductile, et une haute résistance telle celle observable dans les nanomatériaux.

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