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research-article

Effects of superplastic forming on modification of surface properties of Ti alloys for biomedical applications

[+] Author and Article Information
Gianfranco Palumbo

Politecnico di Bari, Department of Mechanics, Mathematics and Management
gianfranco.palumbo@poliba.it

Donato Sorgente

Università degli Studi della Basilicata, School of Engineering
donato.sorgente@unibas.it

Maurizio Vedani

Politecnico di Milano, Department of Mechanical Engineering
maurizio.vedani@polimi.it

Ehsan Mostaed

Politecnico di Milano, Department of Mechanical Engineering
ehsanmostaed@yahoo.com

Milad Hamidi Nasab

Politecnico di Milano, Department of Mechanical Engineering
milad.hamidi@polimi.it

Dario Gastaldi

Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "G. Natta"
dario.gastaldi@polimi.it

Tomaso Villa

Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "G. Natta"
tomaso.villa@polimi.it

1Corresponding author.

ASME doi:10.1115/1.4039110 History: Received May 17, 2017; Revised January 08, 2018

Abstract

In the present work, both the surface chemical contamination and the mechanical alteration of Titanium Grade 5 and Grade 23 plates subjected to superplastic forming for the manufacturing of highly customized biomedical prostheses have been investigated. As case study, a cranial implant was considered. Free Inflation tests were conducted in order to determine the material behavior to be implemented in the numerical model used for simulating the implant manufacturing by superplastic forming. Glow Discharge Optical Emission Spectrometry analyses, nano-indentation tests and metallographic analyses allowed to relate the mechanical alteration to the Oxygen enrichment due to the environmental exposition during processing. Finally, real implants were produced and Cytotoxicity tests were conducted on the most oxidized part in order to determine the effect of the oxygen enrichment on the cells viability.

Copyright (c) 2018 by ASME
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