The most radical innovation in metallurgy since the Bronze Age is hidden inside the shiny 1942 models rolling out of U.S. automakers’ plants this week. For perhaps 5,500 years man has started off with ...

An array of powder-metal parts. Powder metallurgy was practiced long before ancient artisans learned to melt and cast iron. Egyptians made iron tools using PM techniques back in 3,000 B.C. The ancient ...