Hardening Mechanism through Phase Separation of Beta Ti-35Nb-7Zr-5Ta and Ti-35Nb-7Ta Alloys

2012 ◽  
Vol 1487 ◽  
Author(s):  
C. R. M. Afonso ◽  
P. L. Ferrandini ◽  
R. Caram
Keyword(s):  
Phase Separation ◽  
Biomedical Applications ◽  
Metallic Materials ◽  
High Corrosion Resistance ◽  
Coherent Interface ◽  
Hardening Mechanism ◽  
Specific Strength ◽  
Β Phase ◽  
High Specific Strength ◽  
Low Elastic Modulus

AbstractThe β titanium alloys are highly attractive metallic materials for biomedical applications due to their high specific strength, high corrosion resistance and excellent biocompatibility, including low elastic modulus. The aim of this work is the evaluation of hardening mechanism through phase separation in β Ti-35Nb-7Zr-5Ta (TNZT) and Ti-35Nb-7Ta (TNT) alloys. Ingots (50 g) of TNZT and TNT alloys were arc-furnace melted in Ar(g)atmosphere. XRD using synchrotron radiation together with TEM and HRTEM analysis showed the coexistence of two separated phases (β and β’) with similar crystalline structures and slightly different lattice parameters in TNZT and TNT alloys. It was detected a heterogeneous microstructure alternating nanosized dark and bright regions (∼10 nm) with different compositions (Nb-rich β and Ta-Zr-rich β’).In aged condition (400ºC/4h), TNZT and TNT alloys undergoes coherent spinodal decomposition of β phase into two solid solution phases with coherent interface, different compositions and elastic strain associated with nanometric domains of Nb-rich β and Ta-(Zr)-rich β’ phases.

Research Progress of the Surface Oxidation of Titanium and its Alloys

2013 ◽  
Vol 748 ◽  
pp. 188-191
Author(s):  
Hui Jun Yu
Keyword(s):  
Titanium Alloys ◽  
Biomedical Applications ◽  
Influence Factors ◽  
Surface Oxidation ◽  
Research Progress ◽  
Corrosion Resistant ◽  
Specific Strength ◽  
Existing Problems ◽  
High Specific Strength ◽  
Micro Arc Oxidation

Titanium and titanium alloys possess some attractive properties, such as excellent corrosion and erosion resistance, low densities, high specific strength and modulus, enabling them extensively used in aeronautical, marine, chemical and biomedical applications and so on. Nevertheless, Recent years, the corrosion resistance of titanium and titanium alloys is required to elevate in some fields, proper surface modification such as surface oxidation can solve the problems effectively. In this paper, the recent investigations of thermal oxidation and micro-arc oxidation to improve the corrosion resistant of titanium and its alloys are reviewed. The structures, properties and their influence factors of the coatings are analysed systematically. And the existing problems and the future prospect of the further researches is mentioned.

scholarly journals Microstructure and Mechanical Properties of Rapidly Solidified β-Type Ti–Fe–Sn–Mo Alloys with High Specific Strength and Low Elastic Modulus

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1135 ◽  
Author(s):  
Li ◽  
Ma ◽  
Jia ◽  
Meng ◽  
Tang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Volume Fraction ◽  
High Yield ◽  
Specific Strength ◽  
High Specific Strength ◽  
Microstructure And Mechanical Properties ◽  
Low Elastic Modulus ◽  
Mo Content ◽  
Rapidly Solidified

The microstructure and mechanical properties of rapidly solidified β-type Ti–Fe–Sn–Mo alloys with high specific strength and low elastic modulus were investigated. The results show that the phases of Ti–Fe–Sn–Mo alloys are composed of the β-Ti, α-Ti, and TiFe phases; the volume fraction of TiFe phase decreases with the increase of Mo content. The high Fe content results in the deposition of TiFe phase along the grain boundary of the Ti phase. The Ti75Fe19Sn5Mo1 alloy exhibits the high yield strength, maximum compressive strength, large plastic deformation, high specific strength, high Vickers hardness, and large toughness value, which is a superior new engineering material. The elastic modulus (42.1 GPa) of Ti75Fe15Sn5Mo5 alloy is very close to the elastic modulus of human bone (10–30 GPa), which indicating that the alloy can be used as a good biomedical alloy. In addition, the large H/Er and H3/Er2 values of Ti75Fe19Sn5Mo1 alloy indicate the good wear resistance and long service life as biomedical materials.

On the Flow and Creep Strength of Power Law Materials Containing Rigid Reinforcements

1990 ◽  
Vol 194 ◽  
Author(s):  
Ming Y. He
Keyword(s):  
Power Law ◽  
Creep Strength ◽  
Ceramic Materials ◽  
Al Alloys ◽  
Metallic Materials ◽  
Flow Properties ◽  
Flow Strength ◽  
Specific Strength ◽  
High Specific Strength ◽  
Properties Of Materials

AbstractInvestigation of the flow properties of materials containing rigid reinforcements has been prompted by various technological challenges concerned with high specific strength composites. The materials of interest range from metallic materials such as Al alloys, to ceramic materials such as Si3N4 and also include the intermetallics: TiAl and MoSi2. The reinforcements are typically A12O3 and SiC. The strengths of interest may be the flow strength at ambient temperature or the creep strength. The present analysis constitutes an attempt to provide estimates of either the flow or creep strength for matrices that exhibit power law deformation.

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.

scholarly journals REVIEW OF MATERIALS AND TECHNOLOGICAL METHODS USED IN THE MANUFACTURE OF ENDOPROSTHESIS IN TRAUMATOLOGY AND ORTHOPAEDICS

2017 ◽  
Vol 2 (3) ◽  
pp. 13-17
Author(s):  
AV V Kolsanov ◽  
AN N Nikolaenko ◽  
VV V Ivanov ◽  
SA A Prichodko ◽  
PV V Platonov
Keyword(s):  
Corrosion Resistance ◽  
Musculoskeletal System ◽  
Surface Finish ◽  
High Corrosion Resistance ◽  
Specific Strength ◽  
The Third ◽  
High Specific Strength ◽  
Different Types ◽  
Low Modulus ◽  
Technological Methods

Traumas and diseases of the musculoskeletal system are the second among the causes of temporary disability of the population, and the third among the causes of disability and mortality. An effective method of treatment is endoprosthetics. ; Every year across the globe 500-1000 patients per 1 million of population require prosthetics. The development of endoprostheses is progressing in various spheres: design of the implant parts, methods of fixation, use of various materials, different types of surface finish of implants. Endoprostheses that are currently produced and used in traumatology and orthopaedics are unified, i.e. ; standardized - all of them have different size, but their shape is the same. This imposes serious limitations on the use of implantation in difficult clinical cases. The way out can be the use of personified implants, designed and manufactured with the use of modern rapid prototyping technologies. In this case, the use of titanium will fully implement the most important advantages of this direction: the best biocompatibility, high corrosion resistance, low modulus of elasticity, high specific strength and endurance.

Influence of Misch Metal Addition and Deformation Processes on Microstructure and Mechanical Properties in AZ61 Alloy

2007 ◽  
Vol 539-543 ◽  
pp. 1707-1712 ◽  
Author(s):  
Suk Bong Kang ◽  
Hyoung Wook Kim ◽  
Sang Su Jeong ◽  
Jae Woon Kim
Keyword(s):  
Magnesium Alloys ◽  
Metallic Materials ◽  
Specific Strength ◽  
High Specific Strength ◽  
Misch Metal ◽  
Deformation Processes ◽  
Structural Parts ◽  
Strength And Stiffness ◽  
Metal Addition ◽  
Hexagonal Closed Packed

Magnesium alloys have been known as the best lightweight metallic materials for various applications of electronic equipments and automobile parts due to high specific strength and stiffness. The needs for wrought magnesium alloys have been increased for the application to structural parts in the form of sheets and bars. However, magnesium has a hexagonal closed-packed (HCP) crystal structure with a limited number of operative slip systems at room temperature, and its formability is restricted to mild deformation. The improvement of the formability of magnesium sheets for real applications is important. In order to increase formability of magnesium sheets at elevated temperature, one promising way is a grain refinement.

scholarly journals A Brief Introduction on the Development of Ti-Based Metallic Glasses

2022 ◽  
Vol 8 ◽  
Author(s):  
M. Zhang ◽  
Y.Q. Song ◽  
H.J. Lin ◽  
Z. Li ◽  
W. Li
Keyword(s):  
Metallic Glasses ◽  
High Strength ◽  
Specific Strength ◽  
Glass Forming ◽  
High Specific Strength ◽  
Wear And Corrosion ◽  
Low Elastic Modulus ◽  
High Elasticity ◽  
Wear And Corrosion Resistance ◽  
Element Free

Ti-based metallic glasses (MGs) possess high specific strength, low elastic modulus, high elasticity, high wear and corrosion resistance, and excellent biocompatibility, which make them highly attractive as lightweight high-strength materials as well as biomaterials. However, the glass forming ability (GFA) of Ti-based MGs, particularly those bearing no toxic, noble, or heavy metals, that is, Be, Pd, or Cu alike, largely sets back their wide applications for the restricted critical glass forming size of these Ti-based MGs. In this review, the outlines in developing Ti-based MGs are delineated in order to provide an overall view on the efforts ever made to fabricate bulk size Ti-based MGs. The state of the art in the knowledge on the GFA of Ti-based MGs is briefly introduced, and possible directions for fabricating bulk size toxic and noble element free Ti-based MGs are discussed.

Processing and Characterization of β-Ti Alloys by Means of Powder Metallurgy Processing and Blender Elemental

2012 ◽  
Vol 727-728 ◽  
pp. 61-66 ◽  
Author(s):  
F. Devesa ◽  
S. Rial ◽  
Vicente Amigó
Keyword(s):  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Mechanical Characterization ◽  
Processing Technique ◽  
High Corrosion Resistance ◽  
Β Phase ◽  
Ti Alloys ◽  
Low Elastic Modulus ◽  
Singular Characteristics

Titanium is an increasingly used material on industry. Based on Ti and titanium alloys characteristics, one of the most favorable processing methods is the powder metallurgy. Attending to microstructure, alloys showing β phase have singular characteristics of low elastic modulus, good specific properties and high corrosion resistance, which make β-Ti alloys very appropriated for specific uses covering a width list of fields including aeronautics or biomaterials. At this work, it has been obtained and characterized different β-Ti alloys. The processing technique has been optimized by means of an initial blender elemental followed by basic powder metallurgy. Microstructural and mechanical characterization of the studied alloys has been achieved. Results show that these kinds of alloys can be produced by this technique and the obtained properties are really interesting for a wide variety of applications.

Study of the Possibilities of Obtaining Powder Materials by Rotational Turning with Multi-Faceted Cutters

2022 ◽  
Vol 1049 ◽  
pp. 62-68
Author(s):  
Aleksandr S. Binchurov ◽  
Yuri Gordeev ◽  
Vladimir Kuleshov ◽  
Andrew Dvoryansky ◽  
Alexei Gribanov ◽  
...  
Keyword(s):  
Composite Materials ◽  
Matrix Material ◽  
Raw Material ◽  
Powder Materials ◽  
High Plasticity ◽  
Metallic Materials ◽  
Specific Strength ◽  
High Specific Strength ◽  
Rotational Turning ◽  
Powder Metallurgy Methods

Composite materials obtained through powder metallurgy methods are increasingly applied in various industries, particularly in aviation and rocket and space equipment which use their high specific strength, resistance to high temperatures and other properties. Producers of composite materials use various metallic and non-metallic materials (fibres and powders) as fillers [1-2]. For example, the high plasticity (moldability) of aluminium powders allows utilizing them as a matrix material in moulding of composites using various methods of rolling, extrusion, and intense plastic deformation [3-5]. However, the widespread use of chip as a raw material for the production of composites is hampered by the complexities in obtaining powders with granules of the necessary shape and size.

Microstructural Behaviors of Boron Modified LCB Titanium Alloy

2014 ◽  
Vol 1025-1026 ◽  
pp. 601-604 ◽  
Author(s):  
Tae Yong Kim ◽  
Dong Geun Lee ◽  
Ka Ram Lim ◽  
Kyung Mok Cho ◽  
Yong Tae Lee
Keyword(s):  
Titanium Alloys ◽  
Low Cost ◽  
Jet Engine ◽  
Cast Ingot ◽  
Specific Strength ◽  
Good Corrosion Resistance ◽  
High Specific Strength ◽  
Beta Titanium ◽  
Low Elastic Modulus ◽  
Beta Titanium Alloys

Titanium has high specific strength, low elastic modulus, and good corrosion resistance. Especially, beta titanium alloys are used for jet engine, turbine blade in automobile and aerospace industries because of its good formability. Among the beta titanium alloys, LCB (Low-Cost Beta) titanium alloys were developed to make economical and mechanical advantages by not using high-cost beta stabilizer like Nb, Zr, Ta but using low-cost beta stabilizer like Mo, Fe, Cr, etc. In LCB titanium alloys, adding a small amount of boron makes grain refinement in cast ingot. This study has analyzed the changes of microstructure which can change mechanical properties after heat treatment and the plastic deformation in case of adding a small amount of boron.

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