Method for the production of dispersion strengthened metal matrix composites

A method of producing a dispersion strengthened metal matrix composite comprising stirring a mixed solid-liquid phase slurry as a dispersing medium under a reduced pressure, adding a dispersion strengthening material to the dispersing medium, and subjecting the resulting composite slurry to an overheat melting treatment in which the temperature is raised to a temperature higher than a liquidus line of a metal in the dispersing medium to conduct degassing with the stirring under a reduced pressure, and continuing stirring under reduced pressure until the dispersion strengthening material is uniformly dispersed in the dispersing medium.

A method of producing a dispersion strengthened metal matrix composite comprising forming a product alloy composition, said method comprises preparing a mixed solid-liquid phase slurry of semi-solidified or semi-molten dispersing medium having a ratio of eutectic texture not greater than 0.3 and having such a composition that a temperature range between solidus line and liquidus line is larger than that of said product alloy composition of said metal matrix composite, incorporating a dispersion strengthening material into said dispersing medium with stirring to form a precomposite material, adding a) a separate alloying ingredient to a resulting molten precomposite material, or b) the precomposite material to a separate alloying molten ingredient, with stirring, to form said product alloy composition of said metal matrix composite.