A β-Type Titanium Alloy With Significantly Changeable Young’S Modulus and Good Mechanical Properties Used for Spinal Fixation Applications

2016 ◽  
pp. 1685-1689
Author(s):  
Huihong Liu ◽  
Mitsuo Niinomi ◽  
Masaaki Nakai ◽  
Ken Cho ◽  
Kengo Narita
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Spinal Fixation

G0410204 Durability of a spinal fixation device made of a low Young's modulus titanium alloy subjected to surface hardening

2014 ◽  
Vol 2014 (0) ◽  
pp. _G0410204--_G0410204-
Author(s):  
Kengo NARITA ◽  
Mitsuo NIINOMI ◽  
Masaaki NAKAI ◽  
SUYALATU ◽  
Hisashi SOYAMA ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Young’S Modulus ◽  
Surface Hardening ◽  
Young's Modulus ◽  
Spinal Fixation ◽  
Fixation Device

Micromechanical Study of the Forged Ti-1023 Titanium Alloy by Micro-Indentation

2018 ◽  
Vol 765 ◽  
pp. 160-165
Author(s):  
Jiang Li ◽  
Fu Guo Li ◽  
Xin Kai Ma ◽  
Ming Jie Zhang ◽  
Zhan Wei Yuan
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Titanium Alloy ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Strain Hardening Exponent ◽  
Instrumental Approach ◽  
Initial Yield Stress ◽  
Non Destructive ◽  
Micro Indentation

In order to study the micromechanical behaviour of the forged Ti-1023 titanium alloy, micro-indentation experiments of the forged Ti-1023 titanium alloy were performed with various maximum indentation loads from 500 mN to 4000 mN and various loading speeds from 5.06 mN/s to 51.85 mN/s. Using the experimental data, the non-destructive instrumental approach was applied to indicate the mechanical properties just like the Young’s modulusE, microhardnessH, initial yield stressσyand strain hardening exponentnusing theP-hcurves from the tests. The result showed that the value of the indentation Young’s modulus basically remain unchanged in the range from 110 GPa to 150 GPa andHdecreased with the increase of the load, the micro-indentaion plasticity constitutive equations were obtained by using Hookean elastic and power-law plastic stress-strain equations.

Development of Changeable Young's Modulus with Good Mechanical Properties in β-Type Ti-Cr-O Alloys

2013 ◽  
Vol 575-576 ◽  
pp. 453-460
Author(s):  
Hui Hong Liu ◽  
Mitsuo Niinomi ◽  
Masaaki Nakai ◽  
Junko Hieda ◽  
Ken Cho
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Stress Shielding ◽  
Shielding Effect ◽  
Potential Candidate ◽  
Spinal Fixation ◽  
High Tensile Strength ◽  
Cold Rolled

A novel β-type titanium alloy with a changeable Youngs modulus, that is, with a low Young's modulus to prevent the stress-shielding effect for patients and a high Young's modulus to suppress springback for surgeons, should be developed in order to satisfy the conflicting requirements of both the patients and surgeons in spinal fixation operations. In this study, the oxygen content in ternary Ti-11Cr-O alloys was optimized in order to achieve a large changeable Young's modulus with good mechanical properties for spinal fixation applications. The increase in Youngs moduli of all the examined alloys by cold rolling is attributed to the deformation-induced ω-phase transformation which is suppressed by oxygen. Among the examined alloys, the Ti-11Cr-0.2O alloy exhibits the largest changeable Youngs modulus and a high tensile strength with an acceptable plasticity under both solution-treated (ST) and cold-rolled (CR) conditions. Therefore, the Ti-11Cr-0.2O alloy, which shows a good balance among a changeable Youngs modulus, high tensile strength and good plasticity, is considered a potential candidate for spinal fixation applications.

Mechanical properties of FeAlSi powders prepared by mechanical alloying from different initial feedstock materials

2019 ◽  
Vol 107 (2) ◽  
pp. 207 ◽  
Author(s):  
Jaroslav Čech ◽  
Petr Haušild ◽  
Miroslav Karlík ◽  
Veronika Kadlecová ◽  
Jiří Čapek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Young’S Modulus ◽  
Milling Time ◽  
Young's Modulus ◽  
Element Model ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Particles ◽  
Complete Homogenization

FeAl20Si20 (wt.%) powders prepared by mechanical alloying from different initial feedstock materials (Fe, Al, Si, FeAl27) were investigated in this study. Scanning electron microscopy, X-ray diffraction and nanoindentation techniques were used to analyze microstructure, phase composition and mechanical properties (hardness and Young’s modulus). Finite element model was developed to account for the decrease in measured values of mechanical properties of powder particles with increasing penetration depth caused by surrounding soft resin used for embedding powder particles. Progressive homogenization of the powders’ microstructure and an increase of hardness and Young’s modulus with milling time were observed and the time for complete homogenization was estimated.

scholarly journals First principles computation of composition dependent elastic constants of omega in titanium alloys: implications on mechanical behavior

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
R. Salloom ◽  
S. A. Mantri ◽  
R. Banerjee ◽  
S. G. Srinivasan
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
First Principles ◽  
Young's Modulus ◽  
Group Vi ◽  
Group V ◽  
Β Phase ◽  
Ti Alloys ◽  
Ω Phase ◽  
Stabilizer Concentration

AbstractFor decades the poor mechanical properties of Ti alloys were attributed to the intrinsic brittleness of the hexagonal ω-phase that has fewer than 5-independent slip systems. We contradict this conventional wisdom by coupling first-principles and cluster expansion calculations with experiments. We show that the elastic properties of the ω-phase can be systematically varied as a function of its composition to enhance both the ductility and strength of the Ti-alloy. Studies with five prototypical β-stabilizer solutes (Nb, Ta, V, Mo, and W) show that increasing β-stabilizer concentration destabilizes the ω-phase, in agreement with experiments. The Young’s modulus of ω-phase also decreased at larger concentration of β-stabilizers. Within the region of ω-phase stability, addition of Nb, Ta, and V (Group-V elements) decreased Young’s modulus more steeply compared to Mo and W (Group-VI elements) additions. The higher values of Young’s modulus of Ti–W and Ti–Mo binaries is related to the stronger stabilization of ω-phase due to the higher number of valence electrons. Density of states (DOS) calculations also revealed a stronger covalent bonding in the ω-phase compared to a metallic bonding in β-phase, and indicate that alloying is a promising route to enhance the ω-phase’s ductility. Overall, the mechanical properties of ω-phase predicted by our calculations agree well with the available experiments. Importantly, our study reveals that ω precipitates are not intrinsically embrittling and detrimental, and that we can create Ti-alloys with both good ductility and strength by tailoring ω precipitates' composition instead of completely eliminating them.

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