Microstructural Characterization and Mechanical Properties of As-Cast Ti-12Mo-25Nb Biocompatible New Alloy

2020 ◽  
Vol 1012 ◽  
pp. 466-470
Author(s):  
Mariana Lima de Almeida ◽  
Caio Marcello Felbinger Azevedo Cossú ◽  
Carlos Angelo Nunes ◽  
Luiz Henrique de Almeida ◽  
Sinara Borborema
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Biomedical Application ◽  
Microstructural Characterization ◽  
X Ray Diffraction ◽  
Tungsten Electrode ◽  
Arc Melting ◽  
Low Elastic Modulus ◽  
Impulse Excitation

The β-titanium alloys have properties such as low elastic modulus associated with good properties mechanical, higher corrosion resistance and biocompatibility properties ideal for orthopedic application. Recent studies showed that the traditional Ti–6Al–4V alloy (α+β type) presented biological toxicity due to the presence of Al and V in its composition. In this scenario the present work aims at the fabrication and characterization of the microstructure and the mechanical properties of the as–cast Ti-12Mo-25Nb alloy. This alloy was produced by arc melting with non-consumable tungsten electrode in argon atmosphere. The material was characterized by X–ray diffraction, optical microscopy, Vickers hardness and elastic modulus by impulse excitation. The results of the microstructural characterization showed the presence of the β single phase, hardness equal to 207HV and the elastic modulus equal to 77GPa. These characteristics shows that this alloy is suitable for biomedical application such as implants.

Mechanical and Microstructural Characterization of the Ti-25Ta-25Nb Alloy for Dental Applications

2016 ◽  
Vol 869 ◽  
pp. 935-939 ◽  
Author(s):  
M.R. Seixas ◽  
C. Bortolini Jr. ◽  
R.T. Konatu ◽  
A. Pereira Jr. ◽  
Ana Paula Rosifini Alves Claro
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloys ◽  
Biomedical Applications ◽  
Cold Work ◽  
Microstructural Characterization ◽  
Nickel Titanium ◽  
Low Elastic Modulus ◽  
Nickel Titanium Alloys ◽  
Dental Applications

Titanium and its alloys have been used in biomedical applications due to their excellent properties such as high corrosion resistance, biocompatibility and mechanical properties. In orthodontics, initially, it was common to use nickel-titanium alloys, however due to allergic reactions of patients, new titanium alloys containing elements such as niobium and tantalum are being studied. The Ti-25Ta-25Nb alloy is a β-titanium alloy and it has a low elastic modulus. In the present work, the ternary alloy was evaluated after cold work by swaging followed by solubilization treatment. Microstructure and mechanical properties were evaluated after each step of the process. Results were similar to find in the literature for this alloy obtained by other processing rote.

Synthesis and Characterisation of New Superelastic and Low Elastic Modulus Ti-Nb-X Alloys for Biomedical Application

2011 ◽  
Vol 409 ◽  
pp. 170-174
Author(s):  
A. Ramarolahy ◽  
Philippe Castany ◽  
Thierry Gloriant ◽  
Frédéric Prima ◽  
P. Laheurte ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Yield Strength ◽  
Shape Memory ◽  
Biomedical Application ◽  
The Other ◽  
Alloying Element ◽  
Low Elastic Modulus ◽  
Superelastic Behavior ◽  
Good Biocompatibility

Ti-Nb based alloys are well known to their good mechanical properties, shape memory effect, superelasticity, as well as good biocompatibility. The Ti-24Nb (at%) binary alloy presents a shape memory behavior and low elastic modulus. Our study is focused on the improvement of their mechanical properties by adding a third alloying element (oxygen, nitrogen or silicon). Addition of 0.5 at% of N or O modifies drastically the mechanical behavior of Ti-24Nb alloy that exhibits superelastic behavior instead of shape memory one. On the other hand, addition of 0.5 at% of Si increased yield strength of the Ti-24Nb shape memory alloy.

scholarly journals The Influence of the Third Element on Nano-Mechanical Properties of Iron Borides FeB and Fe2B Formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) Alloys

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4155
Author(s):  
Ivana Kirkovska ◽  
Viera Homolová ◽  
Ivan Petryshynets ◽  
Tamás Csanádi
Keyword(s):  
Mechanical Properties ◽  
Indentation Size Effect ◽  
Microstructural Characterization ◽  
Indentation Hardness ◽  
Indentation Modulus ◽  
Instrumented Indentation ◽  
X Ray Diffraction ◽  
Alloying Element ◽  
X Ray

In this study, the influence of alloying elements on the mechanical properties of iron borides FeB and Fe2B formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) alloys were evaluated using instrumented indentation measurement. The microstructural characterization of the alloys was performed by means of X-ray diffraction and scanning electron microscope equipped with an energy dispersive X-ray analyzer. The fraction of the phases present in the alloys was determined either by the lever rule or by image analysis. The hardest and stiffest FeB formed in Fe-B-X (X = C, Cr, Mn) alloys was observed in the Fe-B-Cr alloys, where indentation hardness of HIT = 26.9 ± 1.4 GPa and indentation modulus of EIT = 486 ± 22 GPa were determined. The highest hardness of Fe2B was determined in the presence of tungsten as an alloying element, HIT = 20.8 ± 0.9 GPa. The lowest indentation hardness is measured in manganese alloyed FeB and Fe2B. In both FeB and Fe2B, an indentation size effect was observed, showing a decrease of hardness with increasing indentation depth.

Study Microstructure and Mechanical Properties of Prosthesis of Forging

2015 ◽  
Vol 1766 ◽  
pp. 3-8
Author(s):  
D. C. Rojas-Olmos ◽  
N. López-Perrusquia ◽  
M. A. Doñu-Ruiz ◽  
J.A Juanico Loran ◽  
C. R. Torres San Miguel
Keyword(s):  
Mechanical Properties ◽  
Optical Microscopy ◽  
Modulus Of Elasticity ◽  
Hot Forging ◽  
Microstructural Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Forging Process ◽  
Temperature Study

ABSTRACTThis work studies the change microstructural and mechanical properties of biomedical component hot forging of titanium; was assessed quantitatively and qualitatively the microstructural features obtained in this titanium biocompatible Ti6Al4V. The forging process was obtained at temperature of 950 °C, after by technical optical microscopy are obtained the microstructural characterization showing the phases present after forging. Likewise, the technical X-ray diffraction (XRD) shows the presence of the phases. Also is evaluated the hardness and modulus of elasticity by technical nanoindentation. The characterization of this material has the objective to show that the results obtained with temperature study of 950 °C. Likewise by the forging process obtained a type phases and optimal properties required for these biomedical materials.

scholarly journals Mechanical and Microstructural Characterizations on Commercial and Synthesized by the Sol-Gel Method Using Chicken Egg Shells as Precursor Hydroxyapatite

2021 ◽  
Vol 2 (2) ◽  
pp. 1365-1374
Author(s):  
Marcelo Vitor Ferreira Machado ◽  
José Brant De Campos ◽  
Marilza Sampaio Aguilar ◽  
Vitor Santos Ramos
Keyword(s):  
Mechanical Properties ◽  
Vickers Microhardness ◽  
Sol Gel ◽  
Microstructural Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chicken Egg ◽  
Experimental Parameters ◽  
Egg Shells

The purpose of this work is to determine one of the most important mechanical properties of brittle materials, the hardness. Our work material is called hydroxyapatite (HAP), in this case, using chicken egg shells as precursor. Once considering the experimental parameters of force and time of the indentation, the Vickers microhardness measurements were obtained for both for HAP, synthesized from chicken egg shells and commercial hydroxyapatite for comparison purposes. The microstructural characterization of the materials, as well as their specimens, has been performed by the microscope scanning, x-ray diffraction and thermogravimetric analyses.

scholarly journals Preparation, Microstructural Characterization, and Selected Mechanical Properties of Ti-20Zr-2.5Mo and Ti-20Zr-7.5Mo Used as Biomaterial

2016 ◽  
Vol 869 ◽  
pp. 946-951 ◽  
Author(s):  
Pedro Akira Bazaglia Kuroda ◽  
Marília Afonso Rabelo Buzalaf ◽  
Carlos Roberto Grandini
Keyword(s):  
Mechanical Properties ◽  
Modulus Of Elasticity ◽  
Vickers Microhardness ◽  
Mechanical Characterization ◽  
Rietveld Method ◽  
Microstructural Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cp Ti

Titanium is used in the biomedical field due to its mechanical strength/density, corrosion resistance, and biocompatibility. In this paper, the preparation, and the structural, microstructural, and mechanical characterization of Ti-20Zr-2.5Mo and Ti-20Zr-7.5Mo alloys are presented. The elements were melted into an arc furnace with an argon controlled atmosphere. To determine the amount of impurities present in each alloy, an analysis of the chemical composition was conducted using EDS. The samples were characterized by measurements of density, X-ray diffraction (with the diffractograms refined by the Rietveld method), and optical and scanning electron microscopy. The mechanical properties were evaluated using Vickers microhardness test and modulus of elasticity. The results showed that that α’/α’’ and α’'/β phases coexisted in both of the prepared alloys, respectively. The alloys have higher hardness than cp-Ti and their modulus of elasticity values are very close to the modulus values of cp-Ti.

scholarly journals Functional Bionanocomposite Fibers of Chitosan Filled with Cellulose Nanofibers Obtained by Gel Spinning

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1563
Author(s):  
Sofia Marquez-Bravo ◽  
Ingo Doench ◽  
Pamela Molina ◽  
Flor Estefany Bentley ◽  
Arnaud Kamdem Tamo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Cellulose Nanofibers ◽  
Microstructural Characterization ◽  
Fiber Formation ◽  
Fiber Direction ◽  
Composite Fibers ◽  
X Ray Diffraction ◽  
Gel Spinning ◽  
X Ray

Extremely high mechanical performance spun bionanocomposite fibers of chitosan (CHI), and cellulose nanofibers (CNFs) were successfully achieved by gel spinning of CHI aqueous viscous formulations filled with CNFs. The microstructural characterization of the fibers by X-ray diffraction revealed the crystallization of the CHI polymer chains into anhydrous chitosan allomorph. The spinning process combining acidic–basic–neutralization–stretching–drying steps allowed obtaining CHI/CNF composite fibers of high crystallinity, with enhanced effect at incorporating the CNFs. Chitosan crystallization seems to be promoted by the presence of cellulose nanofibers, serving as nucleation sites for the growing of CHI crystals. Moreover, the preferential orientation of both CNFs and CHI crystals along the spun fiber direction was revealed in the two-dimensional X-ray diffraction patterns. By increasing the CNF amount up to the optimum concentration of 0.4 wt % in the viscous CHI/CNF collodion, Young’s modulus of the spun fibers significantly increased up to 8 GPa. Similarly, the stress at break and the yield stress drastically increased from 115 to 163 MPa, and from 67 to 119 MPa, respectively, by adding only 0.4 wt % of CNFs into a collodion solution containing 4 wt % of chitosan. The toughness of the CHI-based fibers thereby increased from 5 to 9 MJ.m−3. For higher CNFs contents like 0.5 wt %, the high mechanical performance of the CHI/CNF composite fibers was still observed, but with a slight worsening of the mechanical parameters, which may be related to a minor disruption of the CHI matrix hydrogel network constituting the collodion and gel fiber, as precursor state for the dry fiber formation. Finally, the rheological behavior observed for the different CHI/CNF viscous collodions and the obtained structural, thermal and mechanical properties results revealed an optimum matrix/filler compatibility and interface when adding 0.4 wt % of nanofibrillated cellulose (CNF) into 4 wt % CHI formulations, yielding functional bionanocomposite fibers of outstanding mechanical properties.

scholarly journals Fabrication and Characterization of Electrospun Polycaprolactone Blended with Chitosan-Gelatin Complex Nanofibrous Mats

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Yongfang Qian ◽  
Zhen Zhang ◽  
Laijiu Zheng ◽  
Ruoyuan Song ◽  
Yuping Zhao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Weight Ratio ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
Tissue Engineering Scaffolds ◽  
Elongation At Break ◽  
Nanofibrous Scaffolds ◽  
Two Peaks

Design and fabrication of nanofibrous scaffolds should mimic the native extracellular matrix. This study is aimed at investigating electrospinning of polycaprolactone (PCL) blended with chitosan-gelatin complex. The morphologies were observed from scanning electron microscope. As-spun blended mats had thinner fibers than pure PCL. X-ray diffraction was used to analyze the degree of crystallinity. The intensity at two peaks at 2θof 21° and 23.5° gradually decreased with the percentage of chitosan-gelatin complex increasing. Moreover, incorporation of the complex could obviously improve the hydrophilicity of as-spun blended mats. Mechanical properties of as-spun nanofibrous mats were also tested. The elongation at break of fibrous mats increased with the PCL content increasing and the ultimate tensile strength varied with different weight ratios. The as-spun mats had higher tensile strength when the weight ratio of PCL to CS-Gel was 75/25 compared to pure PCL. Both as-spun PCL scaffolds and PCL/CS-Gel scaffolds supported the proliferation of porcine iliac endothelial cells, and PCL/CS-Gel had better cell viability than pure PCL. Therefore, electrospun PCL/Chitosan-gelatin nanofibrous mats with weight ratio of 75/25 have better hydrophilicity mechanical properties, and cell proliferation and thus would be a promising candidate for tissue engineering scaffolds.

Influence of the Residue of Casting by Lost Wax in the Modulus of Elasticity and Porosity of Concretes

2014 ◽  
Vol 805 ◽  
pp. 343-349
Author(s):  
Carine F. Machado ◽  
Weber G. Moravia
Keyword(s):  
Construction Industry ◽  
Modulus Of Elasticity ◽  
Chemical Characterization ◽  
Microstructural Characterization ◽  
Cement Matrix ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hardened State ◽  
Material Powder

This work evaluated the influence of additions of the ceramic shell residue (CSR), from the industries of Lost Wax Casting, in the modulus of elasticity and porosity of concrete. The CSR was ground and underwent a physical, chemical, and microstructural characterization. It was also analyzed, the environmental risk of the residue. In the physical characterization of the residue were analyzed, the surface area, and particle size distribution. In chemical characterization, the material powder was subjected to testing of X-ray fluorescence (XRF). Microstructural characterization was performed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The residue was utilized like addition by substitution of cement in concrete in the percentages of 10% and 15% by weight of Portland cement. It was evaluated properties of concrete in the fresh and hardened state, such as compressive strength, modulus of elasticity, absorption of water by total immersion and by capillarity. The results showed that the residue can be used in cement matrix and improve some properties of concrete. Thus, the CSR may contribute to improved sustainability and benefit the construction industry.

Sign in / Sign up

Export Citation Format

Share Document