A method of refining the grain structure and improving the hardness and strength properties of a metal or metal alloy workpiece is disclosed. The workpiece is subjected to forces that corrugate and then straighten the workpiece. These steps are repeated until an ultrafine-grained product having improved hardness and strength is produced.
This invention was made with government support under Contract No. W-7405-ENG-36 awarded by the U. S. Department of Energy to The Regents to the University of California. The U. S. Government has certain rights in the invention.