Correlation between porosity level and elastic modulus in a foamed hiped Ti alloy

Correlation between porosity level and elastic modulus in a foamed hiped Ti alloy


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Abstract. Nowadays, in the manufacturing of highly customized prosthetic implants, the need of devices with mechanical properties close to the human bone’s ones plays a key role. In the present work, Ti6Al4V-ELI porous structures obtained by a solid-state foaming process were studied from a microstructural and mechanical point of view, being the aim to control the stiffness of the prostheses in order to be as much as possible close to the human bone’s one, thus reducing the stress shielding effect. Samples with different levels of porosity (average diameter variable between a few microns and about 50 microns) were investigated by means of contact ultrasonic tests in order to evaluate changes in terms of elastic properties. Metallographic observations combined with contact ultrasonic tests revealed that a good correlation exists between the foamed structure (quantity and average size of the pores) and the stiffness.

Ti Alloy, Foaming, Hot Isostatic Pressing, Microstructure, Ultrasonic Tests, Young’s Modulus

Published online 4/19/2023, 8 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: GUGLIELMI Pasquale, CASTELLANO Anna, CUSANNO Angela, PALUMBO Gianfranco, Correlation between porosity level and elastic modulus in a foamed hiped Ti alloy, Materials Research Proceedings, Vol. 28, pp 1427-1434, 2023


The article was published as article 154 of the book Material Forming

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

[1] E. F. Morgan, G.U. Unnikrisnan, A.I. Hussein, Bone Mechanical Properties in Healthy and Diseased States, Annu. Rev. Biomed. Eng. 20 (2018) 119-143.
[2] D. Wu, P. Isaksson, S.J. Ferguson, C. Persson, Young’s modulus of trabecular bone at the tissue level: A review, Acta Biomater. 78 (2018) 1-12.
[3] Y. Guo, F. Liu, X. Bian, K. Lu, P. Huang, X. Ye, C. Tang, X. Li, H. Wang, K. Tang, Effect of Pore Size of Porous-Structured Titanium Implants on Tendon Ingrowth, Appl. Bionics Biomech. 2022 (2022).
[4] M. Chimutengwende-Gordon, R. Dowling, C. Pendegrass, G. Blunn, Determining the porous structure for optimal soft-Tissue ingrowth: An in vivo histological study, PLoS One 13 (2018) 1-17.
[5] M. Niinomi, M. Nakai, J. Hieda, Development of new metallic alloys for biomedical applications, Acta Biomater. 8 (2012) 3888-3903.
[6] C. Piao, D. Wu, M. Luo, H. Ma, Stress shielding effects of two prosthetic groups after total hip joint simulation replacement, J. Orthop. Surg. Res. 9 (2014) 1-8.
[7] S. Oppenheimer, D.C. Dunand, Solid-state foaming of Ti-6A1-4V by creep or superplastic expansion of argon-filled pores, Acta Mater. 58 (2010) 4387-4397.
[8] G. Palumbo, G. Ambrogio, A. Crovace, A. Piccininni, A. Cusanno, P. Guglielmi, L. De Napoli, G. Serratore, A Structured Approach for the Design and Manufacturing of Titanium Cranial Prostheses via Sheet Metal Forming, Metals 12 (2022) 293.
[9] J. Barrios-Muriel, F. Romero-Sánchez, F.J. Alonso-Sánchez, D.R. Salgado, Advances in orthotic and prosthetic manufacturing: A technology review, Materials 13 (2020) 295.
[10] G. Ambrogio, G. Palumbo, E. Sgambitterra, P. Guglielmi, A. Piccininni, L. De Napoli, T. Villa, G. Fragomeni, Experimental investigation of the mechanical performances of titanium cranial prostheses manufactured by super plastic forming and single-point incremental forming, Int. J. Adv. Manuf. Technol. 98 (2018) 1489-1503.
[11] P. Guglielmi, A. Piccininni, A. Cusanno, A.A. Kaya, G. Palumbo, Mechanical and microstructural evaluation of solid-state foamed Ti6Al4V-ELI alloy, Procedia CIRP 110 (2022)105-110.
[12] M.E. Gurtin, The linear theory of elasticity, in: Linear theories of elasticity and thermoelasticity, Springer, 1973.
[13] A. Castellano, P. Foti, A. Fraddosio, S. Marzano, M.D. Piccioni, Mechanical characterization of CFRP composites by ultrasonic immersion tests: Experimental and numerical approaches, Compos. Part B Eng. 66 (2014) 299-310.