Diffusion of Oxygen and Nitrogen in the Ti-15Mo Alloy Used for Biomedical Applications

2012 ◽  
Vol 326-328 ◽  
pp. 696-701 ◽  
Author(s):  
José Roberto Severino Martins ◽  
Renata Abdallah Nogueira ◽  
Raul Oliveira de Araújo ◽  
Carlos Roberto Grandini
Keyword(s):  
Mechanical Properties ◽  
Diffusion Coefficients ◽  
Biomedical Applications ◽  
Good Combination ◽  
Mechanical Spectroscopy ◽  
Matrix Metal ◽  
Excellent Corrosion Resistance ◽  
The Matrix ◽  
Exponential Factors ◽  
Interstitial Elements

The Ti-15Mo alloy is a promising material for use as a biomaterial because of its excellent corrosion resistance and its good combination of mechanical properties, such as fatigue, hardness, and wears resistance. This alloy has a body-centered predominantly cubic crystalline structure and the addition of interstitial atoms, such as oxygen and nitrogen, strongly alters its mechanical properties. Mechanical spectroscopy is a powerful tool to study the interaction of interstitial elements with the matrix metal or substitutional solutes, providing information such as the distribution and the concentration of interstitial elements. The objective of this paper is to study of the effects of heavy interstitial elements, such as oxygen and nitrogen, on the anelastic properties of the Ti-15Mo alloy by using mechanical spectroscopy measurements. In this study, the diffusion coefficients, pre-exponential factors, and activation energies were calculated for the oxygen in the Ti-15Mo alloy.

scholarly journals Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen

2016 ◽  
Vol 61 (1) ◽  
pp. 25-30 ◽  
Author(s):  
J.R.S. Martins ◽  
R.O. Araújo ◽  
R.A. Nogueira ◽  
C.R. Grandini
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Wear Resistance ◽  
Internal Friction ◽  
Good Combination ◽  
Relaxation Processes ◽  
Mechanical Spectroscopy ◽  
Excellent Corrosion Resistance ◽  
Low Elastic Modulus ◽  
Internal Friction Spectra

Ti-Mo alloys are promising materials for use as biomaterials, because these alloys have excellent corrosion resistance and a good combination of mechanical properties such as fatigue, low elastic modulus, hardness, and wear resistance. The objective of this paper was to study the effect of heavy interstitial atoms on anelastic properties of Ti-Mo alloys using mechanical spectroscopy. The internal friction and Young’s modulus were measured as a function of temperature using dynamic mechanical analyser. The internal friction spectra were brought about by relaxation processes attributed to shortrange stress induced reorientation of interstitial and substitutional complexes in solid solution. It is suggested that the nature of the relaxing entities can be worked out in further research on Ti-Mo single crystals.

Diffusion of Oxygen in Ti-15Mo-xZr Alloys Studied by Anelastic Spectroscopy

2014 ◽  
Vol 354 ◽  
pp. 159-165 ◽  
Author(s):  
Fábio Bossoi Vicente ◽  
Carlos Roberto Grandini
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Titanium Alloys ◽  
Diffusion Coefficients ◽  
Elasticity Modulus ◽  
Metallic Matrix ◽  
Orthopedic Implants ◽  
Exponential Factors ◽  
Effect Of Oxygen ◽  
Interstitial Elements

Because of their low elasticity modulus, titanium alloys have excellent biocompatibility, and are largely used in orthopedic prostheses. Among the properties that are beneficial for use in orthopedic implants is the elasticity modulus, which is closely connected to the crystal structure of the material. Interstitial elements, such as oxygen, change the mechanical properties of the material. Anelastic spectroscopy measurements are a powerful tool for the study of the interaction of these elements with the metallic matrix and substitutional solutes, providing information on the diffusion and concentration of interstitial elements. In this study, the effect of oxygen on the anelastic properties of alloys in the Ti-15Mo-Zr system was analyzed using anelastic spectroscopy measurements. The diffusion coefficients, pre-exponential factors, and activation energies of these alloys were calculated for oxygen.

Diffusion of Nitrogen in Ti-13V-11Cr-3Al Alloys

2009 ◽  
Vol 283-286 ◽  
pp. 38-44 ◽  
Author(s):  
Carlos Roberto Grandini ◽  
Emerson Haruiti Kamimura ◽  
José Roberto Severino Martins ◽  
Hugo Ricardo Zschommler Sandim ◽  
Odila Florêncio
Keyword(s):  
Solid Solution ◽  
Internal Friction ◽  
Diffusion Coefficients ◽  
Crystalline Lattice ◽  
Mechanical Spectroscopy ◽  
Interstitial Concentration ◽  
Exponential Factors ◽  
Friction Measurements ◽  
Internal Friction Spectra ◽  
Interstitial Elements

Metals with a bcc crystalline structure such as Ti-13V-11Cr-3Al alloys have their physical properties significantly changed through the addition of interstitial elements such as oxygen and nitrogen. These metals can dissolve substantial amounts of interstitial elements forming solid solutions. Mechanical spectroscopy measurements constitute a powerful tool for studying interactions of these interstitial elements with other elements that make up the alloy. From these measurements, it is possible to obtain information regarding diffusion, interstitial concentration, interaction between interstitials, and other imperfections of the crystalline lattice. In this paper, Ti-13V-11Cr-3Al alloys with several amount of nitrogen, in a solid solution, were studied using mechanical spectroscopy (internal friction) measurements. The results presented complex internal friction spectra which were resolved in a series of constituent Debye peaks corresponding to different interactions and interstitial diffusion coefficients. Pre-exponential factors and activation energies were calculated for nitrogen in theses alloys.

Oxygen Diffusion in an Nb-Ta Alloy Measured by Mechanical Spectroscopy

2011 ◽  
Vol 312-315 ◽  
pp. 1228-1232
Author(s):  
Carlos Roberto Grandini ◽  
Luciano Henrique de Almeida ◽  
Durval Rodrigues Júnior
Keyword(s):  
Internal Friction ◽  
Crystalline Structure ◽  
Mechanical Spectroscopy ◽  
Substitutional Solute ◽  
Interstitial Atoms ◽  
Exponential Factors ◽  
Solute Interactions ◽  
Friction Measurements ◽  
Internal Friction Spectra ◽  
Interstitial Elements

When metals that present bcc crystalline structure receive the addition of interstitial atoms as oxygen, nitrogen, hydrogen and carbon, they undergo significant changes in their physical properties because they are able to dissolve great amounts of those interstitial elements, and thus form solid solutions. Niobium and most of its alloys possess a bcc crystalline structure and, because Brazil is the largest world exporter of this metal, it is fundamental to understand the interaction mechanisms between interstitial elements and niobium or its alloys. In this study, mechanical spectroscopy (internal friction) measurements were performed on Nb-8.9wt%Ta alloys containing oxygen in solid solution. The experimental results presented complex internal friction spectra. With the addition of substitutional solute, interactions between the two types of solutes (substitutional and interstitial) were observed, considering that the random distribution of the interstitial atoms was affected by the presence of substitutional atoms. Interstitial diffusion coefficients, pre-exponential factors and activation energies were calculated for oxygen in this alloy.

Diffusion of Oxygen in some Binary Ti-Based Alloys Used as Biomaterials

2015 ◽  
Vol 364 ◽  
pp. 165-173
Author(s):  
Carlos Roberto Grandini
Keyword(s):  
Crystalline Lattice ◽  
Specific Strength ◽  
High Specific Strength ◽  
Ti Alloys ◽  
Excellent Corrosion Resistance ◽  
Low Elastic Modulus ◽  
Exponential Factors ◽  
Good Biocompatibility ◽  
Effect Of Oxygen ◽  
Interstitial Elements

Ti and its alloys are widely used as biomaterials. Their main properties are excellent corrosion resistance, relatively low elastic modulus, high specific strength, and good biocompatibility. The development of new Ti alloys with properties favorable for use in the human body is desired. To this end, Ti alloys with Mo, Nb, Zr, and Ta are being developed, because these elements do not cause cytotoxicity. The presence of interstitial elements (such as oxygen and nitrogen) induces strong changes in the elastic properties of the material, which leads to hardening or softening of the alloy. By means of anelastic spectroscopy, we are able to obtain information on the diffusion of these interstitial elements present in the crystalline lattice. In this paper, the effect of oxygen on the anelastic properties of some binary Ti-based alloys was analyzed with anelastic spectroscopy. The diffusion coefficients, pre-exponential factors, and activation energies were calculated for oxygen and nitrogen in these alloys.

Biomedical Applications: Composite Metal Alloys with Additives

2015 ◽  
Vol 819 ◽  
pp. 337-340
Author(s):  
Rohaya Abdullah ◽  
Nur Maizatul Shima Adzali ◽  
Zuraidawani Che Daud
Keyword(s):  
Mechanical Properties ◽  
Biomedical Applications ◽  
Rapid Development ◽  
Metal Alloys ◽  
Matrix Component ◽  
The Poor ◽  
Bioactive Properties ◽  
Alternative Materials ◽  
The Matrix ◽  
Modifying Additive

Recently, many researchers focused on biocompability, corrosion resistance and properties behavior of implant materials in order to length the endoprostheses life. One of the rapid development areas of research is in the biomaterials field. Historically the uses of biomaterials has been to replace diseased or damaged tissues. This present paper reviews the research works carried out in the field of composite metal alloys reinforced with additive and to analyze the influence of modifying additive on mechanical properties of composite materials on the cobalt (Co), titanium (Ti) and magnesium (Mg) based alloy. The desirable mechanical properties of the matrix component compensate for the poor mechanical behavior of the biomaterials, while in turn the desirable bioactive properties of the additives improve those of metal alloys. The following additives were reviewed for research: poly methyl methacrylate (PMMA), fluoroapatite (FA) and bioglass. Results show that these composites can be the alternative materials for biomedical applications.

scholarly journals Dopamine Self-Polymerization as a Simple and Powerful Tool to Modulate the Viscoelastic Mechanical Properties of Peptide-Based Gels

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1363
Author(s):  
Galit Fichman ◽  
Joel P. Schneider
Keyword(s):  
Mechanical Properties ◽  
Biomedical Applications ◽  
Hybrid Peptide ◽  
Peptide Assembly ◽  
Rheological Measurements ◽  
Transmission Electron ◽  
Powerful Approach ◽  
The Matrix ◽  
Application Potential ◽  
Gel Network

Dopamine is a small versatile molecule used for various biotechnological and biomedical applications. This neurotransmitter, in addition to its biological role, can undergo oxidative self-polymerization to yield polydopamine, a robust universal coating material. Herein, we harness dopamine self-polymerization to modulate the viscoelastic mechanical properties of peptide-based gels, expanding their ever-growing application potential. By combining rapid peptide assembly with slower dopamine auto-polymerization, a double network gel is formed, where the fibrillar peptide gel network serves as a scaffold for polydopamine deposition, allowing polydopamine to interpenetrate the gel network as well as establishing crosslinks within the matrix. We have shown that triggering the assembly of a lysine-rich peptide gelator in the presence of dopamine can increase the mechanical rigidity of the resultant gel by a factor of 90 in some cases, while retaining the gel’s shear thin-recovery behavior. We further investigate how factors such as polymerization time, dopamine concentration and peptide concentration alter the mechanical properties of the resultant gel. The hybrid peptide–dopamine gel systems were characterized using rheological measurements, circular dichroism spectroscopy and transmission electron microscopy. Overall, triggering peptide gelation in the presence of dopamine represents a simple yet powerful approach to modulate the viscoelastic mechanical properties of peptide-based gels.

scholarly journals USING OF CoCr ALLOYS IN BIOMEDICAL APPLICATIONS ( REVIEW)

2021 ◽  
Vol 21 (4) ◽  
pp. 320-328
Author(s):  
Haydar H.J. Jamal Al Deen
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Mechanical Strength ◽  
Biomedical Applications ◽  
Dental Amalgam ◽  
Ti Alloys ◽  
Excellent Corrosion Resistance ◽  
Surgical Implants ◽  
Cocr Alloy

Metals are used extensively in biomedical applications due to their mechanical strength, corrosion resistance, and biocompatibility. There are many types of metals and alloys used in this application ( stainless steel, Ti and Ti alloys, CoCr, dental amalgam, etc). This review focus on CoCr alloys which have excellent corrosion resistance and mechanical properties which make them the best choice for many types of surgical implants. There are many alloying elements used to improve the properties of CoCr alloy such as ( Zr, In, Ta, etc ) has been reviewed.

Review of the Mechanical Properties of Cast Steels With Emphasis on Fatigue Behavior and the Influence of Microdiscontinuities

1977 ◽  
Vol 99 (4) ◽  
pp. 329-343 ◽  
Author(s):  
M. R. Mitchell
Keyword(s):  
Mechanical Properties ◽  
Fatigue Behavior ◽  
Matrix Metal ◽  
Cast Steels ◽  
The Matrix ◽  
Strength And Ductility

Mechanical properties of cast steels are pronouncedly affected by the microdiscontinuities which they inherently contain. In particular, fatigue behavior of cast steels is altered by (1) the size, (2) the shape, and (3) the distribution of microdiscontinuities as well as (4) the strength and ductility of the matrix metal. A review is made of the literature in order to demonstrate the necessity of accounting for all of these variables and a technique for predicting the fatigue behavior of cast steels is presented.

scholarly journals The Influence of Dispersion Time On The Mechanical Properties of Spark Plasma Sintered Carbon Nanotubes Reinforced Nickel-Aluminium Matrix Composites

2021 ◽  
Author(s):  
Olusoji Oluremi Ayodele ◽  
Mary Ajimegoh Awotunde ◽  
Bukola Joseph Babalola ◽  
Peter Apata Olubambi
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Ball Milling ◽  
High Speed ◽  
Structural Integrity ◽  
Matrix Composites ◽  
Matrix Metal ◽  
The Matrix ◽  
Spark Plasma ◽  
High Speed Ball Milling

Abstract Nickel (Ni) and aluminium (Al) powders were milled with carbon nanotubes (CNT) by employing the high-speed ball milling approach, and the consolidation was achieved by spark plasma sintering technology (SPS). The microstructural evolution of the milled samples and consolidated samples were examined, and the mechanical properties were investigated. The outcome indicated the agglomeration of CNT within the NiAl matrix, and the CNT dispersions improved with the milling duration. The structural integrity of the CNT was evaluated using the Raman analysis which depicted that the ID/IG ratio decreased from 0.986 to 0.867 as the high-speed ball milling was longer, which also depicts more damage to the CNT. The microhardness of the consolidated composite was enhanced from 287.7 HV-320.4 HV due to better dispersion of CNT within the matrix metal. Furthermore, the predicted tensile strength and yield strength of the composite improved from 4011.9 MPa-4428.8 MPa, and from 5747.9 MPa-6389.3 MPa.

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