Amorphous Al-based alloys essentially containing Ni and/or Fe and Si and process for the production thereof
AssigneeCegedur Pechiney
InventorSalim Dermarkar
Life of this patent
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Abstract
The invention is directed to microcrystalline Al-based alloys produced by annealing an alloy formed initially in a substantially amorphous state by rapid solidification (about 10.sup.4 K/sec) and having a composition consisting essentially of, in atomic %: from 5 to 30% Si from 11 to 22% Ni wherein the Ni may be partially substituted by Fe up to 10%, by V or B up to 5 atomic % each, or totally substituted by Mn up to 22 atomic %, and wherein Fe+Ni+Si.ltoreq.42%. In the microcrystalline state, in the vicinity of the first crystallization peak, there is a metastable hexagonal phase whose crystalline parameters are about a=0.661 nm and c=0.378 nm.
Claims11
Microcrystalline Al-based alloy produced by annealing an alloy formed initially in a substantially amorphous state by rapid solidification, between 10.sup.5 and 10.sup.4 .degree.K./sec., from a temperature range at around 100.degree. C. above the liquidus of the alloy produced, consisting essentially of, in atomic %:
- from 5 to 30% Si
- from 11 to 22% Ni
- wherein the Ni may be partially substituted by Fe up to 10%, by V or B up to 5% each, or totally substituted by Mn up to 22%, and wherein Fe+Ni+Si.ltoreq.42% the balance being formed by Al and the usual production impurities, said alloy containing, in the microcrystalline state, in the vicinity of the first crystallization peak, a metastable hexagonal phase whose crystalline parameters are about a=0.661 nm and c=0.378 nm.
Dependencies are inferred from the claim text.