Two phase titanium aluminide alloy

C - Chemistry – Metallurgy – 22 – C

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C22C 14/00 (2006.01) C22F 1/18 (2006.01)

Patent

CA 2319505

A two phase titanium aluminide alloy having a lamellar microstructure with little intercolony structures. The alloy can include fine particles such as boride particles at colony boundaries and/or grain boundary equiaxed structures. The alloy can include alloying additions such as <= 10 at % W, Nb and/or Mo. The alloy can be free of Cr, V, Mn, Cu and/or Ni and can include, in atomic %, 45 to 55 % Ti, 40 to 50 % Al, 1 to 5 % Nb, 0.3 to 2 % W, up to 1% Mo and 0.1 to 0.3 % B. In weight %, the alloy can include 57 to 60 % Ti, 30 to 32 % Al,4 to 9 % Nb,up to 2 % Mo, 2 to 8 % W and 0.02 to 0.08 % B.

L'invention se rapporte à un alliage d'aluminure de titane à deux phases possédant une microstructure lamellaire comportant peu de structures inter-colonies. L'alliage peut comporter de fines particules telles que des particules de borure au niveau des frontières de colonies et/ou des structures équiaxes des joints de grains. Ledit alliage peut être additionné d'éléments d'alliage, par exemple moins de 10 %, en pourcentage atomique, de W, Nb et/ou Mo. Il peut ne pas contenir de Cr, V, Mn, Cu et/ou Ni mais peut contenir, en pourcentage atomique, 45 à 55 % de Ti, 40 à 50 % d'Al, 1 à 5 % de Nb, 0,3 à 2 % de W, jusqu'à 1 % de Mo et 0,1 à 0,3 % de B. En pourcentage pondéral, cet alliage peut contenir 57 à 60 % de Ti, 30 à 32 % d'Al, 4 à 9 % de Nb, jusqu'à 2 % de Mo, 2 à 8 % de W et 0,02 à 0,08 % de B.

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