メカニカルアロイング法によるFe-Ti混合粉末の合金化挙動

概要

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The mixture of mole ratio 1 : 1 of Fe and Ti powders was subjected to mechanical alloying in an Ar atmosphere using a forced – stirring ball mill. The morphology of powder particles varied with milling time from cakes to flakes, and then to fine grains with equiaxed shape. Analysis by EPMA revealed that the initial cake – like particles consisted of Fe layer and Ti layer. However, milling over long periods of time resulted in the disappearance of layer structure. It was demonstrated that the milling of more than 360 ks produced an “X-ray amorphous”. Electron diffraction indicated that has only a trace amount of microcrystals existed in such amorphous phase. When the milling time reached 180 ks or more, the powder was markedly contaminated by abrasive wear of the vessel and ball of the mill. After 1440 ks, crystalline (Cr, Fe)₇C₃ phase began to form.