Controlling reversible martensitic transformation in titanium alloys with high strength and low elastic modulus

2012 ◽  
Vol 67 (5) ◽  
pp. 487-490 ◽  
Author(s):  
Y.L. Hao ◽  
S.J. Li ◽  
F. Prima ◽  
R. Yang
Keyword(s):  
Elastic Modulus ◽  
Martensitic Transformation ◽  
Titanium Alloys ◽  
High Strength ◽  
Low Elastic Modulus

Analysis on the Martensitic Transformation in the Ti-xNb Alloys Using a Phenomenological Theory

2007 ◽  
Vol 124-126 ◽  
pp. 1669-1672 ◽  
Author(s):  
Hi Won Jeong ◽  
Seung Eon Kim ◽  
Chang Yong Jo ◽  
Yong Tae Lee ◽  
Joong Kuen Park
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Martensitic Transformation ◽  
Shape Memory ◽  
Titanium Alloys ◽  
Martensitic Transformations ◽  
Phenomenological Theory ◽  
Transition Elements ◽  
Low Elastic Modulus ◽  
Diffraction Peaks

The titanium alloys containing the Nb transition elements have been investigated as the Ni-free shape memory and the biomedical alloys with a low elastic modulus. The mechanical properties of the alloys depended upon the meta-stable phases like the α`, α``, ω. To study the martensitic transformations from the β to α`` or α` the Ti-xNb (x=0 to 40 wt%) alloys were melted into the button type ingots using a VAR, and followed by the water-quenching after the soaking at 1000oC for 2hrs. The crystallography of the martensitic phases in the water-quenched alloys was analyzed using a XRD. The diffraction peaks of the orthorhombic martensites were identified by the crystallographic relationship with the bcc matrix. The lattice parameters of the orthorhombic martensites were varied continuously with the contents of the Nb elements. The martensitic transformations of the alloys were studied using the phenomenological theory of Bowles and Mackenzie.

Preparation and Characterisation of New Titanium Based Alloys for Orthopaedic and Dental Applications

2006 ◽  
Vol 15-17 ◽  
pp. 71-76 ◽  
Author(s):  
A. Nouri ◽  
X.B. Chen ◽  
Peter D. Hodgson ◽  
Cui E Wen
Keyword(s):  
Elastic Modulus ◽  
Titanium Alloys ◽  
High Strength ◽  
Porous Titanium ◽  
Vacuum Furnace ◽  
Powder Metallurgy Method ◽  
Porous Metals ◽  
X Ray Diffraction ◽  
Low Elastic Modulus ◽  
Dental Applications

Various types of titanium alloys with high strength and low elastic modulus and, at the same time, vanadium and aluminium free have been developed as surgical biomaterials in recent years. Moreover, porous metals are promising hard tissue implants in orthopaedic and dentistry, where they mimic the porous structure and the low elastic modulus of natural bone. In the present study, new biocompatible Ti-based alloy foams with approximate relative densities of 0.4, in which Sn and Nb were added as alloying metals, were synthesised through powder metallurgy method. The new alloys were prepared by mechanical alloying and subsequently sintered at high temperature using a vacuum furnace. The characteristics and the processability of the ball milled powders and the new porous titanium-based alloys were characterised by X-ray diffraction, optical microscopy and scanning electron microscopy .The mechanical properties of the new titanium alloys were examined by Vickers microhardness measurements and compression testing.

Study of α”-Martensitic Transformation in Ti35NbxSn Alloys Subjected to Cryogenic Heat Treatment

2020 ◽  
Vol 1158 ◽  
pp. 17-26
Author(s):  
Abraão Silva ◽  
Thiago Figueiredo Azevedo ◽  
Weslley Rick Viana Sampaio ◽  
Luiz Carlos Pereira ◽  
Sandro Griza
Keyword(s):  
Heat Treatment ◽  
Elastic Modulus ◽  
Martensitic Transformation ◽  
Cryogenic Treatment ◽  
Quenching Temperature ◽  
High Mechanical Strength ◽  
Quenching Medium ◽  
Β Phase ◽  
Low Elastic Modulus ◽  
Cryogenic Heat Treatment

TiNbSn alloys have been extensively researched due to several properties they exhibit, including high mechanical strength, low elastic modulus, superelasticity, shape memory effect, biocompatibility. The present study evaluated the cryogenic heat treatment in the Ti35NbxSn alloys (x = 0.0; 2.5; 5.0; 7.5). The alloys were arc melted, cold formed and quenched in both water and liquid nitrogen at-198° C. The Ti35Nb2.5Sn alloy was also aged after exposed to both quenching medium. Microstructure and microhardness analyses were performed. Cryogenic treatment was not enough for transformation of primary β phase into martensitic α” in alloys containing 5 and 7.5% Sn. Cryogenic treatment provided β to α” transformation in alloys containing 0 and 2.5% Sn. The Sn-free alloy was more likely to α" transformation in both quenching medium. The alloys microhardness increased with decrease of both quenching temperature and Sn content. The increase of α" is also related to the increase of the alloy microhardness after aging.

Zr–Si biomaterials with high strength and low elastic modulus

2011 ◽  
Vol 32 (8-9) ◽  
pp. 4598-4602 ◽  
Author(s):  
Chunliu Li ◽  
Yongzhong Zhan ◽  
Wenping Jiang
Keyword(s):  
Elastic Modulus ◽  
High Strength ◽  
Low Elastic Modulus

Effect of β-Stabilizing Transition Elements on Elastic Modulus of Ti-M Systems

2004 ◽  
Vol 449-452 ◽  
pp. 865-868 ◽  
Author(s):  
Hi Won Jeong ◽  
Y.S. Kim ◽  
Seung Eon Kim ◽  
Yong Taek Hyun ◽  
Yont Tai Lee ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Titanium Alloys ◽  
Stress Shielding ◽  
Shielding Effect ◽  
Transition Elements ◽  
Generalized Gradient ◽  
First Principle Calculation ◽  
Treatment Conditions ◽  
Low Elastic Modulus ◽  
Artificial Prosthesis

New titanium alloys with a low elastic modulus have been developed for biomedical applications to avoid the stress shielding effect of the artificial prosthesis. The newly developed alloys contained the transition elements like Nb, Ta, Zr which were non-cytotoxicity elements. These elements produced β, ω, and α'' phases with heat treatment conditions in titanium alloys and determined the elastic modulus of the alloys. However, the clear mechanism of the low elastic modulus alloys has not been known. In the present paper, the total energy and elastic modulus of β and α'' phases were calculated using a first principle calculation employing the generalized gradient approximation (GGA). The mechanism of the low elastic modulus was discussed with calculated values.

Effect of HA Content on Microstructure and Compression Properties of Ti-Nb-Sn/HA Composites Fabricated by Plasma Current Activated Sintering

2015 ◽  
Vol 816 ◽  
pp. 705-710
Author(s):  
Xiao Peng Wang ◽  
Yu Yong Chen ◽  
Fan Tao Kong ◽  
Shu Long Xiao
Keyword(s):  
Grain Size ◽  
Elastic Modulus ◽  
Compression Test ◽  
Compression Strength ◽  
High Strength ◽  
Plasma Current ◽  
Activated Sintering ◽  
Compression Properties ◽  
Low Elastic Modulus ◽  
Sintering Properties

Novel bio-composites were synthesized by plasma current activated sintering from the Ti-35Nb-2.5Sn/HA powders ball-milled for 12 h. The aim of this study was to investigate the effects of HA content (5, 10 and 15 wt%) on sintering properties, microstructure and compression properties of Ti-35Nb-2.5Sn/HA bio-composites. Results indicated that sintering rate decreased slightly with the increase of HA content. The phases of sintered composites were mainly˰ڂ˽̤̹˼˰̘̑˼˰Ca3(PO4)2(TCP), TiO2, CaTiO3and TixPy. The grain size of sintered composites reduced with the increasing of HA content, and sintered composites with ultra fine grains were fabricated finally. The compression test showed that all the sintered composites had low elastic modulus and high compression strength. The elastic modulus of Ti-35Nb-2.5Sn/15HA sintered composites was 22GPa with a high strength of 877MPa.

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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