Abstract
Tumbler ball milling experiment on Cu powder was carried out to investigate powder adhesion on ball surfaces and the mill container wall during the mechanical alloying of ductile metal powders. The weight ratio of the adhered powder to an initial powder filling was measured with milling time of up to 40 h as functions of ball filling ratio and powder filling ratio. The motion of milling balls was observed through a transparent end wall of the mill container to study the role of ball motion in the powder adhesion.With an increase in the ball filling ratio from 10 to 50%, the adhesion weight ratio increases and then decreases drastically at 60%. This change in the adhesion weight ratio with ball filling ratio corresponds well to the moment of working ball bed around the center of rotation of the mill container, where moment is regarded as the energy accumulated in the moving ball bed. The adhesion weight ratio decreased with increasing powder filling ratio and it is found that the adhesion weight ratio is proportional to the effective specific milling time. We present a microforging analysis on adhesion for the milled powder particles in equiaxed shape which were cold-welded on the ball surfaces and container wall and microforged into thin adhesion layers by the impacting action of the balls.
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