THERMO-MECHANICAL STRENGTHENING OF HIGH STRENGTH TITANIUM ALLOYS

1970 ◽  
pp. 795-808 ◽  
Author(s):  
H. MARGOLIN ◽  
P.A. FARRAR ◽  
M.A. GREENFIELD
Keyword(s):  
Titanium Alloys ◽  
High Strength

scholarly journals Modification of Mechanical Properties of High-Strength Titanium Alloys VT23 and VT23M Due to Impact-Oscillatory Loading

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 80 ◽  
Author(s):  
Mykola Chausov ◽  
Janette Brezinová ◽  
Andrii Pylypenko ◽  
Pavlo Maruschak ◽  
Liudmyla Titova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloys ◽  
High Strength ◽  
The Self ◽  
Self Organization ◽  
Two Phase ◽  
Rolled Metal ◽  
Technological Method ◽  
Equilibrium Processes ◽  
Production Conditions

A simple technological method is proposed and tested experimentally, which allows for the improvement of mechanical properties in sheet two-phase high-strength titanium alloys VT23 and VT23M on the finished product (rolled metal), due to impact-oscillatory loading. Under impact-oscillatory loading and dynamic non-equilibrium processes (DNP) are realized in titanium alloys, leading to the self-organization of the structure. As a result, the mechanical properties of titanium alloys vary significantly with subsequent loading after the realization of DNP. In this study, the test modes are found, which can be used in the production conditions.

scholarly journals Design of Low-Cost and High-Strength Titanium Alloys Using Pseudo-Spinodal Mechanism through Diffusion Couple Technology and CALPHAD

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2910
Author(s):  
Chaoyi Ding ◽  
Chun Liu ◽  
Ligang Zhang ◽  
Di Wu ◽  
Libin Liu
Keyword(s):  
Diffusion Couple ◽  
Titanium Alloys ◽  
High Throughput ◽  
Volume Fraction ◽  
Raw Materials ◽  
Low Cost ◽  
High Strength ◽  
High Yield ◽  
Α Phase ◽  
Cr System

The high cost of development and raw materials have been obstacles to the widespread use of titanium alloys. In the present study, the high-throughput experimental method of diffusion couple combined with CALPHAD calculation was used to design and prepare the low-cost and high-strength Ti-Al-Cr system titanium alloy. The results showed that ultra-fine α phase was obtained in Ti-6Al-10.9Cr alloy designed through the pseudo-spinodal mechanism, and it has a high yield strength of 1437 ± 7 MPa. Furthermore, application of the 3D strength model of Ti-6Al-xCr alloy showed that the strength of the alloy depended on the volume fraction and thickness of the α phase. The large number of α/β interfaces produced by ultra-fine α phase greatly improved the strength of the alloy but limited its ductility. Thus, we have demonstrated that the pseudo-spinodal mechanism combined with high-throughput diffusion couple technology and CALPHAD was an efficient method to design low-cost and high-strength titanium alloys.

Study of the Key Issues of Friction Stir Welding of Titanium Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 1185-1190 ◽  
Author(s):  
Hui Jie Liu ◽  
Li Zhou ◽  
Yong Xian Huang ◽  
Qi Wei Liu
Keyword(s):  
Titanium Alloy ◽  
Friction Stir Welding ◽  
Melting Point ◽  
Titanium Alloys ◽  
Welding Process ◽  
High Strength ◽  
Liquid Cooling ◽  
Friction Stir ◽  
Key Issues ◽  
Aluminum And Magnesium Alloys

As a new solid-state welding process, friction stir welding (FSW) has been successfully used for joining low melting point materials such as aluminum and magnesium alloys, but the FSW of high melting point materials such as steels and titanium alloys is still difficult to carry out because of their strict requirements for the FSW tool. Especially for the FSW of titanium alloys, some key technological issues need to solve further. In order to accomplish the FSW of titanium alloys, a specially designed tool system was made. The system was composed of W-Re pin tool, liquid cooling holder and shielding gas shroud. Prior to FSW, the Ti-6Al-4V alloy plates were thermo-hydrogen processed to reduce the deformation resistance and tool wear during the FSW. Based on this, the thermo-hydrogen processed Ti-6Al-4V alloy with different hydrogen content was friction stir welded, and the microstructural characterizations and mechanical properties of the joints were studied. Experimental results showed that the designed tool system can fulfill the requirements of the FSW of titanium alloys, and excellent weld formation and high-strength joint have been obtained from the titanium alloy plates.

Changes in the structure of high-strength titanium alloys after HTMT

1979 ◽  
Vol 21 (12) ◽  
pp. 920-923
Author(s):  
I. S. Pol'kin ◽  
A. B. Notkin ◽  
N. M. Semenova
Keyword(s):  
Titanium Alloys ◽  
High Strength

scholarly journals Second-generation Titanium alloys Ti-15Mo and Ti-13Nb-13Zr: A Comparison of the Mechanical Properties for Implant Applications

2020 ◽  
Vol 321 ◽  
pp. 05006
Author(s):  
Florian Brunke ◽  
Carsten Siemers ◽  
Joachim Rösler
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloys ◽  
Second Generation ◽  
Stress Shielding ◽  
Medical Engineering ◽  
High Strength ◽  
Medical Implants ◽  
Alloying Element ◽  
Bone Degradation ◽  
First Choice

Due to their outstanding mechanical properties, excellent corrosion resistance and biocompatibility titanium and titanium alloys are the first choice for medical engineering products. Alloys currently used for implant applications are Ti-6Al-4V (ELI) and Ti-6Al-7Nb. Both alloys belong to the class of (α+β)-alloys and contain aluminium as an alloying element. Aluminium is cytotoxic and can cause breast cancer. In addition, the stiffness of (α+β)-alloys is relatively high which can lead to stress shielding, bone degradation and implant loss. For this reason, second-generation titanium alloys like Ti-15Mo (solute-lean metastable β-alloy) and Ti-13Nb-13Zr (β-rich (α+β)-alloy) have been developed. However, their application in medical implants is limited due to a relatively low strength. Therefore, in the present study, the mechanical properties of Ti-15Mo and Ti-13Nb-13Zr have been optimised by thermomechanical treatments to achieve high strengths combined with low stiffnesses. Different phase compositions have been used, namely, α-, β- and ω-phase in Ti-15Mo and α-, β- and αʺ-phase in Ti-13Nb-13Zr. For Ti-15Mo, the required mechanical properties’ combination could not be achieved whereas Ti-13Nb-13Zr showed high strength and a low Young’s modulus after a dedicated thermo-mechanical treatment. This makes the latter alloy a good option for replacing the (α+β)-alloys in implant applications in the future.

Mechanical Behaviour of Beta Titanium Alloys

2021 ◽  
Vol 1016 ◽  
pp. 964-970
Author(s):  
Nageswara Rao ◽  
Geetha Manivasagam
Keyword(s):  
Heat Treatment ◽  
Titanium Alloys ◽  
Dynamic Properties ◽  
Solution Treatment ◽  
Weight Ratio ◽  
High Strength ◽  
Static Properties ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Titanium Alloys

Beta titanium alloys have several attractive features; this has resulted in this group of alloys receiving much attention since 1980’s. Among the attributes which distinguish them for their superiority over other structural materials are (i) high strength to which they can be heat treated, resulting in high strength to weight ratio (ii) high degree of hardenability which enables heat treatment in large section sizes to high strength levels (iii) excellent hot and cold workability, making them as competitive sheet materials etc. The standard heat treatment consists of solution treatment in beta or alpha plus beta phase field followed by aging. However, certain aging treatments can render the materials in a state of little or no ductility; the designer has to be aware of this behaviour and has to keep away from such treatments while working with the materials. Such unfavourable aging treatments may adversely affect not only the static properties such as reduction in area and elongation in a tensile test, but also dynamic properties such as impact toughness. Results of fractographic studies are in line with those of mechanical testing. The authors would present the foregoing analysis, based primarily on the wide-ranging researches they carried out on beta titanium alloy Ti15-3 and to some extent data published by researchers on other grades of beta titanium alloys. An attempt is made to explain the mechanisms underlying the embrittlement reactions that take place in beta titanium alloys under non-optimal aging treatments.

Study of Isothermal Pneumatic Forming of High-Strength Materials Subject to Energy Theory of Short-Term Creep and Damage

2017 ◽  
Vol 746 ◽  
pp. 36-47
Author(s):  
Sergey Nikolaevich Larin ◽  
Valeriy Ivanovich Platonov ◽  
Evgeniya Vitalievna Leonova
Keyword(s):  
Titanium Alloys ◽  
Rectangular Cross Section ◽  
Evaluation Process ◽  
High Strength ◽  
Reference Points ◽  
Pressure Diffusion ◽  
Hull Structure ◽  
Energy Theory ◽  
Term Creep ◽  
Short Term Creep

Stringer radiator panels made of aluminum and titanium alloys used in the hull structure of the aircraft, which is necessary to maintain the required temperatures. section of the channel profile has a predetermined geometry - a circular or rectangular cross-section of the channel, and the channel itself can be unilateral or bilateral. The technological process of production of radiator panels is to carry out one process machining position, consisting of a series of operations performed by the gas pressure diffusion bonding two sheets and hot-forming gas channels supplied between the sheets. We consider forming a shell of material, following the energy theory of creep and defectiveness. The expressions for the evaluation process and force parameters of damage, in particular - the destruction. The effect sizes of workpiece thickness in the dome, the relative magnitudes of changes in the geometric parameters and the magnitude of damage accumulated from the time of deformation under different laws for the loading of aluminum and titanium alloys. Comparison of theoretical and experimental data on the relative thickness of the dome blanks and reference points, as well as the relative height of the workpiece indicates satisfactory their agreement.

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