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Metals 2016, 6(1), 25; doi:10.3390/met6010025

Porous γ-TiAl Structures Fabricated by Electron Beam Melting Process

1
Princess Fatima Alnijiris’s Research Chair for Advanced Manufacturing Technology (FARCAMT), Advanced Manufacturing Institute, King Saud University, Riyadh 11421, Saudi Arabia
2
Industrial Engineering Department, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
3
Structural Nanomaterials Laboratory, PSG Institute of Advanced Studies, Coimbatore 641004, India
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 17 November 2015 / Revised: 22 December 2015 / Accepted: 13 January 2016 / Published: 18 January 2016

Abstract

Porous metal structures have many benefits over fully dense structures for use in bio-implants. The designs of porous structures can be made more sophisticated by altering their pore volume and strut orientation. Porous structures made from biocompatible materials such as titanium and its alloys can be produced using electron-beam melting, and recent reports have shown the biocompatibility of titanium aluminide (γ-TiAl). In the present work, we produced porous γ-TiAl structures by electron-beam melting, incorporating varying pore volumes. To achieve this, the individual pore dimensions were kept constant, and only the strut thickness was altered. Thus, for the highest pore volume of ~77%, the struts had to be as thin as half a millimeter. To accomplish such fine struts, we used various beam currents and scan strategies. Microscopy showed that selecting a proper scan strategy was most important in producing these fine struts. Microcomputed tomography revealed no major gaps in the struts, and the fine struts displayed compressive stiffness similar to that of natural bone. The characteristics of these highly-porous structures suggest their promise for use in bio-implants. View Full-Text
Keywords: additive manufacturing; electron beam melting; titanium aluminides; porous structures; bio-implants; compressive stiffness additive manufacturing; electron beam melting; titanium aluminides; porous structures; bio-implants; compressive stiffness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mohammad, A.; Alahmari, A.M.; Moiduddin, K.; Mohammed, M.K.; Alomar, A.; Renganayagalu, R.K. Porous γ-TiAl Structures Fabricated by Electron Beam Melting Process. Metals 2016, 6, 25.

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