Abstract: Alloys of Co-Si-X, where X is selected from the group consisting of W, Mo or alloys thereof, are directionally solidified to produce aligned eutectics.

Abstract: Alloys of Co-Si-X, where X is selected from the group consisting of Al, Ga or alloys thereof, are directionally solidified to produce aligned eutectics.

Abstract: Alloys of Co-Si-X, where X is selected from the group consisting of Ta, Nb, V or alloys thereof, are directionally solidified to produce aligned eutectics.

Abstract: A continuous process for producing novel aligned composites of a Co-Si eutectoid type alloy having significant tensile strength is provided. The process comprises forming a melt of a Co.sub.3.sub.-x M.sub.x Si.sub.1.sub.-y N.sub.y alloy where M represents certain elements substituting for Co and x has a value ranging up to 0.6, where N represents certain elements substituting for Si and y has a value ranging up to 0.2, unidirectionally cooling said melt through a thermal gradient at a velocity which produces a solid having elongated columnar macro-grains aligned substantially parallel to each other, and unidirectionally cooling said macro-grain solid through said thermal gradient at said velocity which on reaching transformation temperature directionally transforms said solid into an aligned solid composite consisting essentially of at least two phases, the ratio of said thermal gradient to said velocity being greater than 150.degree.C/cm.sup.2 /hr.