We disclose ultrafine-grained titanium. A coarse-grained titanium billet is subjected to multiple extrusions through a preheated equal channel angular extrusion (ECAE) die, with billet rotation between subsequent extrusions. The resulting billet is cold processed by cold rolling and/or cold extrusion, with optional annealing. The resulting ultrafine-grained titanium has greatly improved mechanical properties and is used to make medical implants.
FIELD OF THE INVENTION
The present invention relates generally to ultrafine-grained titanium and, more particularly, to medical implants and other devices made with ultrafine-grained titanium. 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.