Characterization of Ti-35Nb-7Zr-5Ta Alloy Produced by Powder Metallurgy

2005 ◽  
Vol 498-499 ◽  
pp. 34-39 ◽  
Author(s):  
Elisa B. Taddei ◽  
Vinicius André Rodrigues Henriques ◽  
Cosme Roberto Moreira Silva ◽  
Carlos Alberto Alves Cairo
Keyword(s):  
Powder Metallurgy ◽  
Titanium Alloys ◽  
Microstructural Characterization ◽  
Cold Isostatic Pressing ◽  
Microstructural Development ◽  
Potential Toxic Elements ◽  
Metallic Biomaterials ◽  
Low Modulus ◽  
Orthopedic Applications

Abstract: Titanium and titanium alloys present the highest biocompatibility among metallic biomaterials. The ideal titanium alloy for orthopedic applications should have low modulus of elasticity (near the bone), excellent mechanical strength, high corrosion resistance, formability and no potential toxic elements. Among titanium alloys, the Ti-35Nb-7Zr-5Ta alloy, due its high biocompatibility and lower Young’s modulus is a promising candidate for implants material. The titanium alloys production by powder metallurgy, starting from the elementary powders, is a viable route due at the smaller costs and larger operational facilities. The Ti-35Nb-7Zr-5Ta samples were manufactured by blended elemental method from a sequence of uniaxial and cold isostatic pressing with subsequent densification by sintering between 900 at 1700 °C, in vacuum, under a heating rate of 20 °C×min-1 for 1h. The objective of this work is the analysis of alloy microstructural evolution from the powders dissolution under the increase of the sintering temperature. For the alloy microstructural characterization, scanning electron microscopy and Vickers microhardness measurements, were used. Density was measured by Archimedes method. The samples presented high densification, an homogeneous microstructural development, with complete dissolution of alloying elements in the titanium matrix with the temperature increase.

scholarly journals Microstructural characterization of catalysis product of nanocement based materials: A review

2018 ◽  
Vol 34 ◽  
pp. 01039
Author(s):  
Norsuzailina Mohamed Sutan ◽  
Nur Izaitul Akma Ideris ◽  
Siti Noor Linda Taib ◽  
Delsye Teo Ching Lee ◽  
Alsidqi Hassan ◽  
...  
Keyword(s):  
Carbon Dioxide Emission ◽  
Essential Element ◽  
Microstructural Characterization ◽  
High Energy ◽  
Green Technology ◽  
Microstructural Development ◽  
Cement Replacement ◽  
Alternative Materials ◽  
Partial Cement Replacement

Cement as an essential element for cement-based products contributed to negative environmental issues due to its high energy consumption and carbon dioxide emission during its production. These issues create the need to find alternative materials as partial cement replacement where studies on the potential of utilizing silica based materials as partial cement replacement come into picture. This review highlights the effectiveness of microstructural characterization techniques that have been used in the studies that focus on characterization of calcium hydroxide (CH) and calcium silicate hydrate (C-S-H) formation during hydration process of cement-based product incorporating nano reactive silica based materials as partial cement replacement. Understanding the effect of these materials as cement replacement in cement based product focusing on the microstructural development will lead to a higher confidence in the use of industrial waste as a new non-conventional material in construction industry that can catalyse rapid and innovative advances in green technology.

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.

Mechanical and microstructural characterization of powder metallurgy CoCrNi medium entropy alloy

2017 ◽  
Vol 701 ◽  
pp. 370-380 ◽  
Author(s):  
Igor Moravcik ◽  
Jan Cizek ◽  
Zuzana Kovacova ◽  
Jitka Nejezchlebova ◽  
Michael Kitzmantel ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Microstructural Characterization

Production and Characterization of Ti-Nb Alloys, Using Powders Obtained by HDH Process Aiming the Development of Biomaterials

2014 ◽  
Vol 805 ◽  
pp. 331-336
Author(s):  
Murilo de Oliveira Barbosa ◽  
Rodrigo de Sousa e Silva ◽  
Gerson Fernandes Araújo ◽  
Rayana F. Rodrigues Lourenço ◽  
Fernando Vernilli ◽  
...  
Keyword(s):  
Modulus Of Elasticity ◽  
Microstructural Characterization ◽  
X Ray Diffraction ◽  
High Melting Point ◽  
Heterogeneous Distribution ◽  
The Matrix ◽  
Low Modulus ◽  
Low Toxicity ◽  
Reversible Phase

Titanium is a metal that has high melting point 1668 ° C, the boiling point of 3287° C, low density (4.54 g/cm3) and modulus of elasticity around 12.7 MPa x104. However, one of the most important properties is the biocompatibility, which makes this metal to be the most widely used in biomedical. Several alloys were developed using titanium such as the alloy Ti-6Al-4V, however Al and V show toxic characteristics to the organism. The alloy TiNb has been studied to replace the alloy Ti-6Al-4V, because it presents high biocompatibility, low modulus of elasticity, high corrosion resistance and low toxicity. The alloy TiNb can be obtained by conventional melting route or powder metallurgy, where the powders can be obtained by spray drying, chemical reactions and the process of hydrogenation and dehydrogenation (HDH).The hydrogenation is carried out by inserting hydrogen in the structure of Ti and Nb in vacuum at high temperatures, forming a phase extremely fragile called hydride of Ti and Nb, thus enabling the reduction of particle size by milling. Upon heating under vacuum, the hydrogen is extracted to yield the metals Ti and Nb since the hydrogen forms a reversible phase with metals. This work aims the production and characterization of the alloy TiNb where the powders are obtained through the HDH process, varying the concentration of Nb by weight from 10 to 50%.To analyze the morphology and pore size, formation and composition of phases, we used the techniques of microstructural characterization and mechanical by scanning electron microscopy, BET, X-ray diffraction and compression test. The results showed a heterogeneous distribution of Nb in the matrix Ti as well as a decrease in the modulus of elasticity with increase in percentage of Nb.

scholarly journals Microstructural Characterization of Several Coatings Deposited on Tialnb Intermetallic Alloy/ Charakterystyka Mikrostruktury Wybranych Warstw Wytworzonych Na Podłożu >Stopu Tytanu Na Osnowie Fazy Międzymetalicznej Tialnb

2014 ◽  
Vol 59 (4) ◽  
pp. 1547-1551 ◽  
Author(s):  
M. Góral ◽  
M. Pytel ◽  
K. Dychton
Keyword(s):  
Titanium Alloys ◽  
Tial Alloy ◽  
Intermetallic Phase ◽  
Microstructural Characterization ◽  
Intermetallic Alloy ◽  
Pack Cementation ◽  
High Porosity ◽  
Aluminide Coatings ◽  
New Type

Abstract Titanium alloys based on the γ -TiAl intermetallic phase are a type of material which may replace nickel supperalloys in high temperature applications. Not enough resistance to corrosion at temperatures above 900°C remains the biggest limitation in industrial practices. The paper presents results of preliminary research into application of new type heat resistant coatings on the basis of γ -TiAl alloy. MeCrAlY and Si coatings were formed by pack cementation method. Aluminide coatings were deposited by pack cementation method and VPA. Research results have shown that except for the coating formed by VPA, coatings were characterized by high porosity and therefore would not ensure appropriate protection against oxidation. Further research will be necessary into application of the VPA method in protecting γ-TiAl titanium alloys in order to improve their heat resistance.

scholarly journals Beta Ti-45Nb and Ti-50Nb Alloys Produced by Powder Metallurgy for Aerospace Application

2010 ◽  
Vol 660-661 ◽  
pp. 405-409 ◽  
Author(s):  
G.V. Martins ◽  
Cosme Roberto Moreira Silva ◽  
C.A. Nunes ◽  
Vladimir J. Trava-Airoldi ◽  
L.A. Borges ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Powder Metallurgy ◽  
Titanium Alloys ◽  
Substantial Reduction ◽  
Weight Ratio ◽  
High Strength ◽  
Beta Phase ◽  
Cold Isostatic Pressing ◽  
Specific Mass ◽  
Beta Titanium

Beta titanium alloys parts are used on advanced aerospace systems because of their high strength to weight ratio and excellent corrosion resistance. Production of powder metallurgy titanium alloys components may lead to a substantial reduction in the cost, compared to those produced by conventional cast and wrought processes, because additional working operations and material waste can be avoided. In this work, beta Ti-45Nb and Ti-50Nb were produced by the blended elemental technique, followed by uniaxial and cold isostatic pressing with subsequent densification by sintering. Sintered samples were characterized for phase composition by XRD, microstructure by SEM, hardness by Vickers indentation, specific mass by the Archimedes method and elastic modulus by resonance ultrasound. The sintered samples presented only the beta phase, higher hardness and lower elastic modulus when compared to Ti6Al4V alloy and experimental specific mass value near theoretical specific mass. These characteristics are adequate for application on several aerospace parts.

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