Effect of Pore Structure Regulation on the Properties of Porous TiNbZr Shape Memory Alloys for Biomedical Application

Recently, porous Ti-Nb-based shape memory alloys have been considered as promising implants for biomedical application, because of their non-toxic elements, low elastic modulus, and stable superelasticity. However, the inverse relationship between pore characteristics and superelasticity of porous SMAs will strongly affect their clinical application. Until now, there have been few works specifically focusing on the effect of pore structure on the mechanical properties and superelasticity of porous Ti-Nb-based SMAs. In this study, the pore structure, including porosity and pore size, of porous Ti-22Nb-6Zr alloys was successfully regulated by adjusting the amount and size of space-holder particles. XRD and SEM investigation showed that all these porous alloys had homogeneous composition. Compression tests indicated that porosity played an important role in the mechanical properties and superelasticity of these porous alloys. Those alloys with porosity in the range of 38.5%-49.7% exhibited mechanical properties approaching to cortical bones, with elastic modulus, compressive strength, and recoverable strain in the range of 7.2-11.4 GPa, 188-422 MPa, and 2.4%-2.6%, respectively. Under the same porosity, the alloys with larger pores exhibited lower elastic modulus, while the alloys with smaller pores presented higher compressive strength.

[1]  Yufeng Zheng,et al.  Properties of Porous TiNbZr Shape Memory Alloy Fabricated by Mechanical Alloying and Hot Isostatic Pressing , 2011, Journal of Materials Engineering and Performance.

[2]  Shuichi Miyazaki,et al.  Development and characterization of Ni-free Ti-base shape memory and superelastic alloys , 2006 .

[3]  James Wang,et al.  A new look at biomedical Ti-based shape memory alloys. , 2012, Acta biomaterialia.

[4]  C. V. van Blitterswijk,et al.  Porous Ti6Al4V scaffold directly fabricating by rapid prototyping: preparation and in vitro experiment. , 2006, Biomaterials.

[5]  S. Shabalovskaya,et al.  On the nature of the biocompatibility and on medical applications of NiTi shape memory and superelastic alloys. , 1996, Bio-medical materials and engineering.

[6]  C. Wen,et al.  Porous TiNbZr alloy scaffolds for biomedical applications. , 2009, Acta biomaterialia.

[7]  M. Elahinia,et al.  Manufacturing and processing of NiTi implants: A review , 2012 .

[8]  Mitsuo Niinomi,et al.  Recent research and development in titanium alloys for biomedical applications and healthcare goods , 2003 .

[9]  J. L. Williams,et al.  Tensile testing of rodlike trabeculae excised from bovine femoral bone. , 1989, Journal of biomechanics.

[10]  G. Pharr,et al.  Elastic properties of human cortical and trabecular lamellar bone measured by nanoindentation. , 1997, Biomaterials.

[11]  Abhay Pandit,et al.  Fabrication methods of porous metals for use in orthopaedic applications. , 2006, Biomaterials.

[12]  Tarık Aydoğmuş,et al.  Superelasticity and compression behavior of porous TiNi alloys produced using Mg spacers. , 2012, Journal of the mechanical behavior of biomedical materials.

[13]  H. Kyogoku,et al.  Fabrication of Ti–Nb alloys by powder metallurgy process and their shape memory characteristics , 2013 .

[14]  H. Hosoda,et al.  Shape Memory Behavior of Ti–22Nb–(0.5–2.0)O(at%) Biomedical Alloys , 2005 .

[15]  Shuichi Miyazaki,et al.  Martensitic transformation, shape memory effect and superelasticity of Ti–Nb binary alloys , 2006 .

[16]  C. Cairo,et al.  Production of new titanium alloy for orthopedic implants , 2004 .

[17]  H. Hosoda,et al.  Mechanical Properties of a Ti-Nb-Al Shape Memory Alloy , 2004 .

[18]  C. Baker The Shape-Memory Effect in a Titanium-35 wt.-% Niobium Alloy , 1971 .

[19]  M. Petrzhik,et al.  Bulk and porous metastable beta Ti–Nb–Zr(Ta) alloys for biomedical applications , 2011 .

[20]  Shuichi Miyazaki,et al.  Shape memory characteristics of Ti–22Nb–(2–8)Zr(at.%) biomedical alloys , 2005 .

[21]  M. Zhu,et al.  Indirect determination of martensitic transformation temperature of sintered nickel-free Ti–22Nb–6Zr alloy by low temperature compression test , 2014 .

[22]  V. Brailovski,et al.  Mechanical properties of porous metastable beta Ti–Nb–Zr alloys for biomedical applications , 2013 .

[23]  M. Ashby,et al.  Cellular solids: Structure & properties , 1988 .

[24]  C. Wen,et al.  Nano- and macro-scale characterisation of the mechanical properties of bovine bone , 2007 .

[25]  Presbyterian Origins A New Look at , 2016 .

[26]  A. Boccaccini,et al.  Biodegradable and bioactive porous polymer/inorganic composite scaffolds for bone tissue engineering. , 2006, Biomaterials.