Fatigue behavior of Ti-6Al-4V foams processed by magnesium space holder technique

2015-01-05
Asik, E. Erkan
Bor, Sakir
Porous Ti-6Al-4V alloys are widely used in the biomedical applications for hard tissue implantation due to their elastic moduli being close to that of bone. In this study, porous Ti-6Al-4V alloys were produced with a powder metallurgical process, space holder technique, where magnesium powders were utilized to generate porosity in the range of 51-65 vol%. The production of porous Ti-6Al-4V alloys was composed of three steps. Firstly, spherical Ti-6Al-4V powders with an average size of 55 mu m were mixed with spherical magnesium powders, which have been sieved to an average size of 375 mu m. Secondly, the mixtures were compacted with a hydraulic press under 500 MPa pressure by using a double-ended steel die. Finally, the green compacts were heated to 1200 degrees C, during which magnesium powder evaporates, and sintered for 2 h under high purity argon gas atmosphere. Processed foams were investigated under scanning electron microscope and yielded that the foams were composed of spherical, interconnected macropores and irregular shaped micropores. Monotonic compression tests were conducted under quasi-static test conditions to the processed foams. Yield strengths of the foams were found to vary between 69 and 167 MPa and elastic moduli were between 4 and 12 GPa. Processed foams were also dynamically tested under compression-compression fatigue with a stress ratio of 0.1. The foams exhibited similar fatigue response when maximum applied stress was normalized with the average yield strength of the corresponding porosity content It was found that foams were fatigue immune with a practical limit of 1 million cycles under a maximum applied stress of 0.75 sigma (normalized).
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Suggestions

Characterization and fatigue behavior of Ti-6Al-4V foams
Aşık, Emin Erkan; Bor, Şakir; Department of Metallurgical and Materials Engineering (2012)
Porous Ti-6Al-4V alloys are widely used in the biomedical applications for hard tissue implantation due to its biocompatibility and elastic modulus being close to that of bone. In this study, porous Ti-6Al-4V alloys were produced with a powder metallurgical process, space holder technique, where magnesium powders were utilized in order to generate porosities in the range of 50 to 70 vol. %. In the productions of Ti-6Al-4V foams, first, the spherical Ti-6Al-4V powders with an average size of 55 μm were mixed...
Facile control of hydroxyapatite particle morphology by utilization of calcium carbonate templates at room temperature
Oral, Çağatay M.; Çalışkan, Arda; Kapusuz, Derya; Ercan, Batur (Elsevier BV, 2020-09-01)
Hydroxyapatite (HAp, Ca-10(PO4)(6)(OH)(2)) particles are widely used in orthopedic applications due to their chemical resemblance to the inorganic component of bone tissue. Since physical and chemical properties of HAp particles influence bone regeneration, various synthesis techniques were developed to precisely control the particle properties. However, most of these techniques required high reaction temperatures, which limited the spectrum of obtained HAp particle morphologies. In this study, ellipsoidal,...
Synthesis and characterization of zirconium based bulk amorphous alloys
Saltoğlu, İlkay; Akdeniz, Mahmut Vedat; Department of Metallurgical and Materials Engineering (2004)
In recent years, bulk amorphous alloys and nanocrystalline materials have been synthesized in a number of ferrous and non-ferrous based alloys systems, which have gained some applications due to their unique physico-chemical and mechanical properties. In the last decade, Zr-based alloys with a wide supercooled liquid region and excellent glass forming ability have been discovered. These systems have promising application fields due to their mechanical properties; high tensile strength, high fracture toughne...
Modeling and simulation of viscous electro-active polymers
Vogel, Franziska; Göktepe, Serdar; Steinmann, Paul; Kuhl, Ellen (2014-11-01)
Electro-active materials are capable of undergoing large deformation when stimulated by an electric field. They can be divided into electronic and ionic electro-active polymers (EAPs) depending on their actuation mechanism based on their composition. We consider electronic EAPs, for which attractive Coulomb forces or local re-orientation of polar groups cause a bulk deformation. Many of these materials exhibit pronounced visco-elastic behavior. Here we show the development and implementation (o)f a constitu...
Stem Cell and Advanced Nano Bioceramic Interactions
Kose, Sevil; Kankilic, Berna; Gizer, Merve; Dede, Eda Ciftci; Bayramlı, Erdal; KORKUSUZ, PETEK; KORKUSUZ, FEZA (2018-01-01)
Bioceramics are type of biomaterials generally used for orthopaedic applications due to their similar structure with bone. Especially regarding to their osteoinductivity and osteoconductivity, they are used as biodegradable scaffolds for bone regeneration along with mesenchymal stem cells. Since chemical properties of bioceramics are important for regeneration of tissue, physical properties are also important for cell proliferation. In this respect, several different manufacturing methods are used for manuf...
Citation Formats
E. E. Asik and S. Bor, “Fatigue behavior of Ti-6Al-4V foams processed by magnesium space holder technique,” MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, pp. 157–165, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65816.