The rapidly solidified β-type Ti–Fe–Sn alloys with high specific strength and low elastic modulus

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.

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

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.364.165 ◽

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.

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

MRS Proceedings ◽

10.1557/opl.2012.1526 ◽

2012 ◽

Vol 1487 ◽

Cited By ~ 1

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.

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Development of High Specific-Strength Al-Based Alloys by the Use of Rapidly Solidified Amorphous and Quasicrystalline Powders.

Journal of the Japan Society of Powder and Powder Metallurgy ◽

10.2497/jjspm.45.349 ◽

1998 ◽

Vol 45 (4) ◽

pp. 349-355

Author(s):

Akihisa Inoue

Keyword(s):

Specific Strength ◽

High Specific Strength ◽

Rapidly Solidified

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

Frontiers in Materials ◽

10.3389/fmats.2021.814629 ◽

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.

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Microstructural Behaviors of Boron Modified LCB Titanium Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1025-1026.601 ◽

2014 ◽

Vol 1025-1026 ◽

pp. 601-604 ◽

Cited By ~ 1

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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β-Ti Alloys for Orthopedic and Dental Applications: A Review of Progress on Improvement of Properties through Surface Modification

Coatings ◽

10.3390/coatings11121446 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1446

Author(s):

Longfei Shao ◽

Yiheng Du ◽

Kun Dai ◽

Hong Wu ◽

Qingge Wang ◽

...

Keyword(s):

Corrosion Resistance ◽

Surface Modification ◽

Elastic Modulus ◽

Specific Strength ◽

Comprehensive Properties ◽

Ti Alloys ◽

Beta Titanium ◽

Low Elastic Modulus ◽

Biological Performance ◽

Dental Applications

Ti and Ti alloys have charming comprehensive properties (high specific strength, strong corrosion resistance, and excellent biocompatibility) that make them the ideal choice in orthopedic and dental applications, especially in the particular fabrication of orthopedic and dental implants. However, these alloys present some shortcomings, specifically elastic modulus, wear, corrosion, and biological performance. Beta-titanium (β-Ti) alloys have been studied as low elastic modulus and low toxic or non-toxic elements. The present work summarizes the improvements of the properties systematically (elastic modulus, hardness, wear resistance, corrosion resistance, antibacterial property, and bone regeneration) for β-Ti alloys via surface modification to address these shortcomings. Additionally, the shortcomings and prospects of the present research are put forward. β-Ti alloys have potential regarding implants in biomedical fields.

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Precipitation in Al-Li-Cu Alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100096941 ◽

1981 ◽

Vol 39 ◽

pp. 44-45

Author(s):

J. E. O'Neal ◽

K. K. Sankaran

Keyword(s):

Electron Microscopy ◽

Age Hardening ◽

Precipitation Behavior ◽

Zone Formation ◽

Specific Strength ◽

Hardening Behavior ◽

Cu Alloys ◽

High Specific Strength ◽

Transmission Electron ◽

Structural Applications

Al-Li-Cu alloys combine high specific strength and high specific modulus and are potential candidates for aircraft structural applications. As part of an effort to optimize Al-Li-Cu alloys for specific applications, precipitation in these alloys was studied for a range of compositions, and the mechanical behavior was correlated with the microstructures.Alloys with nominal compositions of Al-4Cu-2Li-0.2Zr, Al-2.5Cu-2.5Li-0.2Zr, and Al-l.5Cu-2.5Li-0.5Mn were argon-atomized into powder at solidification rates ≈ 103°C/s. Powders were consolidated into bar stock by vacuum pressing and extruding at 400°C. Alloy specimens were solution annealed at 530°C and aged at temperatures up to 250°C, and the resultant precipitation was studied by transmission electron microscopy (TEM).The low-temperature (≲100°C) precipitation behavior of the Al-4Cu-2Li-0.2Zr alloy is a combination of the separate precipitation behaviors of Al-Cu and Al-Li alloys. The age-hardening behavior at these temperatures is characteristic of Guinier-Preston (GP) zone formation, with additional strengthening resulting from the coherent precipitation of δ’ (Al3Li, Ll2 structure), the presence of which is revealed by the selected-area diffraction pattern (SADP) shown in Figure la.

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Cytocompatibility of Ti–xZr alloys as dental implant materials

Journal of Materials Science Materials in Medicine ◽

10.1007/s10856-021-06522-w ◽

2021 ◽

Vol 32 (5) ◽

Author(s):

Pinghua Ou ◽

Cong Hao ◽

Jue Liu ◽

Rengui He ◽

Baoqi Wang ◽

...

Keyword(s):

Elastic Modulus ◽

Pure Titanium ◽

Dead Cell ◽

Commercially Pure Titanium ◽

Modulus Ratio ◽

High Mechanical Strength ◽

Commercially Pure ◽

Low Elastic Modulus ◽

Cell Assays ◽

Osteogenic Induction

AbstractTi–xZr (x = 5, 15, 25, 35, 45% wt%) alloys with low elastic modulus and high mechanical strength were fabricated as a novel implant material. The biocompatibility of the Ti–xZr alloys was evaluated by osteoblast-like cell line (MG63) in terms of cytotoxicity, proliferation, adhesion, and osteogenic induction using CCK-8 and live/dead cell assays, electron microscopy, and real-time PCR. The Ti–xZr alloys were non-toxic and showed superior biomechanics compared to commercially pure titanium (cpTi). Ti–45Zr had the optimum strength/elastic modulus ratio and osteogenic activity, thus is a promising to used as dental implants.

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