Structural and magnetic properties of nanocrystalline
stainless steel balls with 15 mm diameter were used for the milling process The ball to powder mass ratio BPR was 15 1 The vial rotational speed ω and the disc rotational speed Ω were established at 800 rpm respectively at 400 rpm during the entire period of milling Several milling times were used ranging from 4 h up to 30 h