メカニカルアロイングにより作製したTi-Alアモルファス粉末の性質

概要

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Ti/Al powder mixture(Ti:Al=1:1) was mechanically alloyed by vibratory ball milling to analyze the action of milling ball size on the formation of an amorphous phase, by using X-ray diffraction analysis, electrical resistivity measurement, microhardness measurement, optical microscopy, SEM and TEM. As a result, the size of milling balls was found to play a decisive role in the amorphous phase formation. The electrical measurement made for the first time on the mechanically alloyed Ti/Al powder to monitor the phase transformation was found to catch successfully the formation of the amorphous phase and its crystallization during milling. TEM observation on the amorphous powder particles revealed that nano-sized crystalline intermetallic compounds were precipitated in the amorphous particles, which suggests that for the formation of the perfect amorphous phase it is of great importance to use milling balls smaller than 4.76mm.