Cryogenic Processing of Biomaterials for Improved ...

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Cryogenic Processing of Biomaterials for Improved Surface Integrity and. Product Sustainability. S. Yang1*, Z. Pu1, D. A. Puleo2, O. W. Dillon, Jr.1, I. S. Jawahir1.
Cryogenic Processing of Biomaterials for Improved Surface Integrity and Product Sustainability 1*

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S. Yang , Z. Pu , D. A. Puleo , O. W. Dillon, Jr. , I. S. Jawahir 1

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Institute for Sustainable Manufacturing, and Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506, USA 2

Center for Biomedical Engineering, University of Kentucky, Lexington, KY 40506, USA

Abstract Improved functional performance and longer service life of biomedical products offer great sustainability benefits. Surface integrity, which can be modified by severe plastic deformation (SPD) processes, affects the functional performance of materials. Two SPD processes – burnishing and machining – were studied under cryogenic conditions. Cryogenic burnishing of a Co-Cr-Mo biomedical alloy using a novel burnishing tool led to significant grain refinement and 80% greater surface microhardness relative to the bulk. Cryogenic burnishing of AZ31 Mg alloy led to a more than 2 mm thick SPD surface layer with remarkably refined microstructure (grains

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