COMPUTER-SIMULATION OF MILLING BALL MOTION IN MECHANICAL ALLOYING

A model simulation of milling-ball motion during mechanical alloying d one by the author's group was reviewed. The Kelvin's dashpot-spring mo del and the discrete element method were employed in the simulation. O ne, two and three dimensional milling-bah motions for three types of b all milling; vibratory, tumbling and planetary ball milling, were stud ied. The simulation formalism was first given, which takes into accoun t the translational and rotational motion and three types of forces; v isco-elastic, frictional and gravitational force. The whole motion of the milling balls was traced contact by contact. The simulation provid ed for each of the milling types the ball motion trajectories, impact velocities and frequencies of the balls, as well as the energy consump tion during mechanical alloying. The results of the simulation were su pported by the experimental observation.