Is that possible to prepare metal powder particle size of 20-40 microns using ball milling by dry milling process. metal basis are Bi-Sn, Bi-Sn-In . If it is possible which kind of balls i have to use like stainless steel or zirconia ball .
It is not possible to crush a soft metal into a ball mill, because the particles do not break, but plastically deform. The only exception is milling into liquid nitrogen (soft metals are also brittle at -195°C).
Metal powders in the size 20-40 microns are not produced by means of milling, but by means of atomizing a melt with argon.