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Multicomponent homogeneous alloys and method for making same

United States Patent

September 2, 2003
View the Complete Patent at the US Patent & Trademark Office
The present application discloses a method for preparing a homogeneous ternary or quaternary alloy from a quaternary melt. The method includes providing a family of phase diagrams for the quaternary melt which shows (i) composition/temperature data, (ii) tie lines connecting equilibrium liquid and solid compositions, and (iii) isotherms representing boundaries of a miscibility gap. Based on the family of phase diagrams, a quaternary melt composition and an alloy growth temperature is selected. A quaternary melt having the selected quaternary melt composition is provided and a ternary or quaternary alloy is grown from the quaternary melt at the selected alloy growth temperature. A method for making homogeneous ternary or quaternary alloy from a ternary or quaternary melt is also disclosed, as are homogeneous quaternary single-crystal alloys which are substantially free from crystal defects and which have the formula A.sub.x B.sub.1-x C.sub.y D.sub.1-y, x and y being the same or different and in the range of 0.001 to 0.999.
Dutta; Partha S. (Troy, NY), Miller; Thomas R. (Schenectady, NY)
Rensselaer Polytechnic Institute (Troy, NY)
09/ 696,626
October 25, 2000
The present invention was made with the support of the Department of Energy Grant No. DE-AC12-76SN3052. The Federal Government may have certain rights in this invention.