FABRICATION OF BULK AMORPHOUS ALLOY BY ROLLING OF MECHANICALLY ALLOYED AL-CR POWDERS

Bulk amorphous alloy was fabricated by rolling of mechanically alloyed Al-Cr powders. Single-phase amorphous alloy was not obtained by only mechanical alloying of Al-15at.%Cr powders; however, the subsequent he at treatment led to complete amorphization. Sound bulk amorphous alloy was obtained by first rolling as-mechanically-alloyed powders at a te mperature not high enough to induce amorphization and then by subseque nt heat treatment which produced amorphization. The degree of compacti on for bulk amorphous alloy obtained by this process was superior to t hat obtained by direct rolling of amorphous powders. The relative dens ity of bulk amorphous alloy increased up to a maximum of 94% with incr easing average rolling pressure.