Exxon Research and Engineering Company

Raghavan Ayer

Ruzica Petkovic-Luton

Trikur Anantharaman Ramanarayanan

Michael J Luton

Joseph Vallone

Stephen Matras

Disclosed is a method for extruding fine grain aluminum mechanically alloyed powder material such that the resulting extruded product is substantially free of texture, which method comprises extruding a billet of the powder material having a mean grain size less than about 5 microns through a die having an internal contour which conforms substantially to the formula: ##EQU1## where R is the radius of the die contour at any given point x along the major axis of the die orifice from its entry plane, R.sub.o is the radius of the billet, and K is an arbitrary constant.

Method of extruding aluminum-base oxide dispersion strengthened

Disclosed are metal powders mixtures which can be mechanically alloyed into oxide dispersion strengthened high temperature alloys. The powder mixtures contain from 0 to 30 wt. % chromium, about 0 to 3 wt. % titanium, about 0.3 wt. % to 10 wt. % aluminum, and from about 0.3 wt. % to 10 wt. % particles of one or more alumina-yttria mixed- oxides selected from the group consisting of Al.sub.2 O.sub.3.2Y.sub.2 O.sub.3, Al.sub.2 O.sub.3.Y.sub.2 O.sub.3, and 5Al.sub.2 O.sub.3.3Y.sub.2 O.sub.3.

Alumina-yttria mixed oxides in dispersion strengthened high temperature

Disclosed are oxide dispersion strengthened high temperature alloy compositions which contain as the dispersoid one or more alumina-yttria mixed-oxides selected from the group consisting of Al.sub.2 O.sub.3.2Y.sub.2 O.sub.3, Al.sub.2 O.sub.3.Y.sub.2 O.sub.3, and 5Al.sub.2 O.sub.3.3Y.sub.2 O.sub.3.

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Stamford, CT, United States of America

Raghavan Ayer