抄録
Mechanical alloying (MA) has been recognized as a novel method for synthesizing amorphous materials by the solid state reaction. So far, alloy systems amorphized by MA are characterized by a negative heat of mixing. This is because a system with a negative heat of mixing possesses potentially a chemical driving force promoting the amorphization. More recently, however, the formation of an amorphous phase by MA has been reported in the Cu-Ta system 3, 4) with a positive heat of mixing. Here a chemical driving force is no longer expected and, instead, the energizing process has been proposed to be involved in the formation of the amorphous phase. The amorphization by MA for mutually immiscible systems which are characterized by a positive heat of mixing has been studied by neutron diffraction, EXAFS and DSC measurements.
