Nanocrystalline material with gigacycle fatigue life.
A processing technology has been developed that can be applied to many different fine wire medical alloys to improve their fatigue properties. This technology has been used to process a low inclusion alloy, 35 cobalt-35 nitinol-20 chromium-10 Molybdenum (ASTM F562 chemistry), hereinafter referred to as System A. After processing, this ultra fine microstructure exhibited relatively high yield strength, good axial ductility and a fatigue limit of 1 GPa at a fatigue lifetime that exceeded 100 million cycles, as reported here.
Schaffer
Jeremy E
JE
Fort Wayne Metals Research Products Corporation, Fort Wayne, Indiana 46809, USA. jeremy_schaffer@fwmetals.com
D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D006244:Hardness; D006245:Hardness Tests; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013718:Tensile Strength
D000497:Alloys; D001672:Biocompatible Materials