Here is a clear and simple explanation of plastic flow in metals and how application of knowledge gained to date on the subject can be used to advantage in the design and production of metal products.The wide use of metals as engineering materials results not only from their mechanical strength and other service properties, but also from the fact that metals can be deformed plastically. That copper possesses a high electrical conductivity would be of considerably less importance if copper could not be rolled into rods and drawn into wire.Similarly, the desirable magnetic properties which can be developed in certain of the iron-silicon and iron-nickel alloys could not be used to their full advantage in many applications if we were limited to melting and casting as the only available methods of fabrication.