Abstract: 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.

Abstract: Disclosed is a method for mechanically compositing metal powders to produce composite metal powder material having a substantially homogeneous dispersion of refractory particles dispersed throughout a metallic matrix and being substantially free of oxide scale. Preferably the composite powder has a mean particle size less than about 50 microns and a mean grain size of less than about 0.5 microns which method comprises milling the metal powders with one or more refractory compounds in the presence of a cryogenic material.

Abstract: Disclosed are dispersion strengthened composite metal powders having an average particle size of less than about 50 microns and an average grain size within the particle of about 0.05 to 0.6 microns.

Abstract: Disclosed is a thermal mechanical treatment for improving the high temperature properties of cast austenitic heat resistant chromium-containing alloy steel structures which method comprises (a) heating the structures to at least the temperature at which chromium carbides go into solution, but below the temperature where incipient melting occurs; (b) maintaining the structures at such a temperature long enough so that at least 50% of the chromium carbides go into solution; (c) applying from about 15% to 60% plastic deformation by hot forming operations; and (d) cooling the structures to room temperature at such a rate to allow complete recrystallization of the grains to occur.

Abstract: 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.

Abstract: 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.