Corrosion resistant aluminum-based alloy

C - Chemistry – Metallurgy – 22 – C

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C22C 45/08 (2006.01) C22C 21/00 (2006.01)

Patent

CA 2015337

The present invention provides a corrosion resistant aluminum-based alloy consisting of a compound which has a composition represented by the general formula: AlaMbNocHfdCre wherein: M is at least one metal element selected from Ni, Fe and Co and a, b, c, d and e are atomic percentages falling within the following ranges: 50% ~ a ~ 88%, 2% ~ b ~ 25%, 2% ~ c ~ 15%, 4% ~ d ~ 20% and 4% ~ e ~ 20%, the compound being at least 50% by volume composed of an amorphous phase. The aluminum-based alloys not only have a high degree of hardness, strength and heat resistance but also exhibit significantly improved corrosion resistance.

La présente invention concerne un alliage à base d'aluminium résistant à la corrosion constitué d'un composé de formule générale suivante : AlaMbNocHfdCre où : M est au moins un élément métallique choisi parmi Ni, Fe et Co et a, b, c, d et e sont des pourcentages atomiques se situant dans les étendues suivantes : 50 % ~ a ~ 88 %, 2 % ~ b ~ 25 %, 2 % ~ c ~ 15 %, 4 % ~ d ~ 20 % et 4 % ~ e ~ 20 %, le composé étant constitué à au moins 50 % en volume d'une phase amorphe. Les alliages à base d'aluminium ont non seulement un degré élevé de dureté, de résistance mécanique et de résistance thermique, mais ils présentent une amélioration importante de la résistance à la corrosion.

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