Composite structure with NbTiAlCr alloy matrix and niobium base metal reinforcement
AssigneeGeneral Electric Company
InventorsMark G. Benz, Melvin R. Jackson, John R. Hughes
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Abstract
Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based alloy are provided. The matrix is preferably an alloy having a niobium and titanium base according to the expression: Nb.sub.balance -Ti.sub.32-48 -Al.sub.8-16 -Cr.sub.2-12. The reinforcement may be in the form Of strands of the higher strength, higher temperature niobium based alloy. The same crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.
Claims10
A metal-metal composite structure adapted to use at temperature above 1,000 degrees centigrade which comprises
- a body of a matrix alloy having a composition in atom percent according to the following expression:
- Nb.sub.balance -Ti.sub.32-48 -Al.sub.8-16 -Cr.sub.2-12
- provided that the sum (Al+Cr)<=22a/o, and where Ti is less than 37a/o the sum (Al+Cr)<=16a/o,
- said body having distributed therein a multitude of ductile reinforcing strand structures of a niobium base alloy having a body centered cubic crystal form to form a composite, and
- said composite being ductile and having higher tensile and rupture strength at temperatures above 1,000 degrees centigrade than that of the matrix alloy.
Dependencies are inferred from the claim text.