1. A material is placed in a drum with stainless steel or tungsten carbide balls.
2. The drum is activated and begins to rotate at high speed à rotation of the
drum gives kinetic energy to the balls.
3. The high kinetic energy of the balls is transferred to the material due to
collision between hard balls and soft material à the material is deformed.
4. During ball milling process, repeated fracturing and welding occur.
Fracturing of bulk material à reduce the particle size. Welding of small
agglomeration of particles à define final shape of the nanoparticles.