Temperature generated from crushing metal into powder

One could estimate the surface area of the powder and figure out the energy require to break the bonds to create the surface. One would then have to make an assumption on the energy losses during the process. Or calcuate the energy per impact and the number of impacts to create the powder, and relate to temperature through the heat capacity accounting for heat loss.

Certainly it's less than the melting temperature.

As far as I know, powders are formed from melts with rapid solidification techniques.