Inco Alloys International, Inc.

Walter E Mattson

Prakash K Mirchandani

Paul S Gilman

Raymond C Benn

Stephen J Donachie

Arun D Jatkar

Arunkumar S Watwe

Winfred L Woodard, Iii

Winfred L Woodward, Iii

The invention comprises an alloy having improved intermediate temperature properties at temperatures up to about 316.degree. C. The alloy contains (by weight percent) about 1-6% X contained as an intermetallic phase in the form of Al.sub.3 X. X is at least one selected from the group consisting of Nb, Ti and Zr. The alloy also contains 0.1-4% strengthener selected from the group consisting of Si and Mg. In addition, the alloy contains about 1-4% C and 0.1-2% O present as aluminum carbides and oxides for grain stabilization.

Intermediate temperature aluminum-base alloy

The alloy of the invention has improved intermediate temperature properties at temperatures up to about 482.degree. C. The alloy contains (by weight percent) a total of about 6-12% X contained as an intermetallic phase in the form of Al.sub.3 X. X is selected from the group consisting of Nb, Ti and Zr. The alloy also contains about 0.1-4% strengthener selected from the group consisting of Co, Cr, Mn, Mo, Ni, Si, V, Nb when Nb is not selected as X and Zr when Zr is not selected as X. In addition, the alloy contains about 1-4% C and about 0.1-2% O.

High temperature aluminum-base alloy

A composite aluminum-base alloy having a mechanically alloyed matrix alloy. The matrix alloy has about 4-40 percent by volume aluminum-containing intermetallic phase. The aluminum-containing intermetallic phase includes at least one element selected from the group consisting of niobium, titanium and zirconium. The intermetallic phase is essentially insoluble in the matrix alloy below one half of the solidus temperature of the matrix alloy. The balance of the matrix alloy is principally aluminum. A stiffener of 5 to 30 percent by volume of the composite aluminum-base alloy is dispersed within the metal matrix.

Aluminum-base composite alloy

High modulus aluminum-base comprise mechanically alloyed aluminum-base compositions contain 10-25% titanium part of which may be replaced by vanadium or zirconium. Within described limits the alloys can contain elements other than oxygen and carbon ordinarily derived from the process control agent used in mechanical alloying.

High modulus A1 alloys

Discloses hot working by rolling or forging of mechanically alloyed aluminum-base alloys containing 5 to 35 volume percent of an aluminum transition metal intermetallic phase, e.g. Al.sub.3 Ti which is insoluble in the solid aluminum matrix. Hot working is carried out at a temperature above about 370.degree. C.

Hot working aluminum-base alloys

A method for forming intermetallic and intermetallic-type precursor alloys for subsequent mechanical alloying applications. Elemental powders are blended in proportions approximately equal to their respective intermetallic compounds. Heating of the blend results in the formation of intermetallic compounds whereas lack of heating results in intermetallic-type powder without the intermetallic structure. The resultant powder is then blended to form a final alloy. Examples involving aluminum-titanium alloys are discussed.

Formation of intermetallic and intermetallic-type precursor alloys for

An improved method is provided for producing mechanically alloyed powders on a commercial scale comprising milling the components of the powder product in a gravity-dependent-type ball mill to produce a powder having a characteristic apparent density. Powder so produced will have reached an acceptable processing level and will meet one criterion for determining whether it will be suitable for further processing to the end product.

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Huntington, WV, United States of America

Walter E Mattson