u00b0 c sec by utilizing a he gas atomizing process the the individual alloy powders were each mixed with sic whiskers so that the fiber volume fraction given in table xiii resulted thus providing various green compacting materials the individual compacting materials were employed to produce a plurality of green compacts under a condition of a pressing force of 4 000 kg cm 2 by utilizing a cip process then the green compacts were placed into a soaking furnace at 450 u00b0 c and maintained for one hour to effect a degassing treatment degassing was followed by hot extrusion under conditions of a heating temperature of 450 u00b0 c and an extrusion ratio of 14 thus providing sinters h 1 to h 3 h 1 and h 2 table xiii______________________________________chemical constituents by weight sic w sinter cr mn zr fe cu mg al vf ______________________________________h sub 1 8 2 2 balance 15h sub 2 8 2 3 balance 20h sub 3 8 2 6 balance 20h sub 1 0 04 0 15 0 4 10 balance 15h sub 2 0 04 0 15 0 7 balance 20______________________________________ sic whisker sinters h 1 to h 3 are examples prepared according to the present invention while.