INFLUENCE OF PRELIMINARY ULTRASONIC PROCESSING OF VT6 TITANIUM ALLOY ON THE STRUCTURE OF A SURFACE LAYER AFTER IMPLANTATION

2020 ◽  
Vol 4 (2) ◽  
pp. 3-17
Author(s):  
V.V. OVCHINNIKOV ◽  
N.V. UCHEVATKINA ◽  
M.YU. SLEZKO ◽  
E.V. LUKYANENKO ◽  
S.V. YAKUTINA ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Surface Layer ◽  
Ion Implantation ◽  
Ultrasonic Processing ◽  
Ultrasonic Impact Treatment ◽  
Compressive Stresses ◽  
Nanostructured Layer ◽  
Alloy Target ◽  
The Creation

The article presents a study on the implantation of silver titanium alloy VT6. It has been shown that ion implantation contributes to the creation of compressive stresses in the surface layer of the target, which makes it possible to increase the endurance indices of the processed alloy under alternating loads. Ultrasonic processing leads to the formation of a nanostructured layer on the surface of a VT6 alloy target. As a result of ultrasonic impact treatment, the structure of the surface layer undergoes significant changes.

scholarly journals Stressed State of the Surface Layer of VT6 Titanium Alloy after Copper and Lead Ion Implantation

2015 ◽  
Vol 8 (36) ◽  
Author(s):  
N. V. Uchevatkina ◽  
Yu. M. Borovin ◽  
V. V. Ovchinnikov ◽  
O. A. Zhdanovich ◽  
A. G. Sbitnev
Keyword(s):  
Titanium Alloy ◽  
Surface Layer ◽  
Ion Implantation ◽  
Stressed State ◽  
Lead Ion

scholarly journals Thermal Effects on Surface and Subsurface Modifications in Laser-Combined Deep Rolling

2021 ◽  
Vol 5 (2) ◽  
pp. 55
Author(s):  
Robert Zmich ◽  
Daniel Meyer
Keyword(s):  
Surface Layer ◽  
Residual Stresses ◽  
Thermal Loads ◽  
Deep Rolling ◽  
Mechanical Loads ◽  
Thermomechanical Process ◽  
Compressive Stresses ◽  
New Process ◽  
Negative Effect ◽  
Compressive Residual Stresses

Knowledge of the relationships between thermomechanical process loads and the resulting modifications in the surface layer enables targeted adjustments of the required surface integrity independent of the manufacturing process. In various processes with thermomechanical impact, thermal and mechanical loads act simultaneously and affect each other. Thus, the effects on the modifications are interdependent. To gain a better understanding of the interactions of the two loads, it is necessary to vary thermal and mechanical loads independently. A new process of laser-combined deep rolling can fulfil exactly this requirement. The presented findings demonstrate that thermal loads can support the generation of residual compressive stresses to a certain extent. If the thermal loads are increased further, this has a negative effect on the surface layer and the residual stresses are shifted in the direction of tension. The results show the optimum range of thermal loads to further increase the compressive residual stresses in the surface layer and allow to gain a better understanding of the interactions between thermal and mechanical loads.

On the efficiency of combined ion implantation for the creation of near-surface nitrogen-vacancy centers in diamond

2016 ◽  
Vol 213 (8) ◽  
pp. 2044-2050 ◽  
Author(s):  
Felipe Fávaro de Oliveira ◽  
Seyed Ali Momenzadeh ◽  
Denis Antonov ◽  
Helmut Fedder ◽  
Andrej Denisenko ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Nitrogen Vacancy ◽  
Near Surface ◽  
Nitrogen Vacancy Centers ◽  
The Creation

The Vacancy Generation Influence on the Initial Stage of Ion Implantation

2015 ◽  
Vol 1097 ◽  
pp. 29-34
Author(s):  
E.S. Parfenova ◽  
Anna G. Knyazeva
Keyword(s):  
Surface Layer ◽  
Ion Implantation ◽  
Metal Surface ◽  
Impurity Concentration ◽  
Coupled Model ◽  
Irreversible Processes ◽  
Concentration Profiles ◽  
Thermodynamics Of Irreversible Processes ◽  
Vacancy Generation ◽  
Initial Stage

The coupled model is presented to describe the elements penetration into the surface layer of metal during the process of ion implantation. Mechanical stresses arising due to the interaction of particles with the surface affect the redistribution of the implanted impurity. In addition, the existence of vacancies in the metal surface and their generation under the stresses influence are taken into account. The kinetic law is written on the basis of the thermodynamics of irreversible processes. The solution had been found numerically. As a result, the distributions of impurity concentration and deformations have been obtained for various time moments. The comparison of the concentration profiles with vacancies and without their have been given.

scholarly journals Transformations of the Microstructure and Phase Compositions of Titanium Alloys during Ultrasonic Impact Treatment. Part I. Commercially Pure Titanium

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 562
Author(s):  
Alexey Panin ◽  
Andrey Dmitriev ◽  
Anton Nikonov ◽  
Marina Kazachenok ◽  
Olga Perevalova ◽  
...  
Keyword(s):  
Surface Layer ◽  
Phase Transformations ◽  
Pure Titanium ◽  
Surface Plastic ◽  
Commercially Pure Titanium ◽  
Ultrasonic Impact Treatment ◽  
Coordination Numbers ◽  
Microscopy Technique ◽  
Transmission Electron ◽  
Treated Sample

Experimental and theoretical studies helped to reveal patterns of surface roughening and the microstructure refinement in the surface layer of commercial pure titanium during ultrasonic impact treatment. Applying transmission electron microscopy technique, a gradient microstructure in the surface layer of the ultrasonically treated sample, where the grain size is varied from nano- to micrometers was revealed. It was shown that the surface plastic strains of the titanium sample proceeded according to the plastic ploughing mechanism, which was accompanied by dislocation sliding, twinning, and the transformations of the microstructure and phase composition. The molecular dynamics method was applied to demonstrate the mechanism of the phase transformations associated with the formation of stacking faults, as well as the reversible displacement of atoms from their sites in the hcp lattice, causing a change in coordination numbers. The role of the electronic subsystem in the development of the strain-induced phase transformations during ultrasonic impact treatment was discussed.

Increasing the titanium alloys durability due to modifications by vibro-abrasive processing of the strengthened surface layer

2021 ◽  
pp. 301-308
Author(s):  
V.V. Altukhova ◽  
R.F. Krupsky ◽  
A.A. Krivenok ◽  
O.G. Shakirova
Keyword(s):  
Titanium Alloy ◽  
Surface Layer ◽  
Nitric Acid ◽  
Titanium Alloys ◽  
Surface Hardening ◽  
World Science ◽  
Impact Surface ◽  
Current State ◽  
State Of Research ◽  
Defective Surface

It is shown that vibroabrasive treatment of hardened titanium alloy specimens contributes to an increase in their durability. This effect is explained by the removal of a defective surface layer containing microcracks and subject to the influence of residual tensile stresses. It is shown that the proposed stage of vibro-abrasive processing with ceramic granules makes it possible to almost completely remove iron introduced after vibro-impact surface hardening, which makes it possible to exclude the operation of etching in nitric acid from the technological process. The current state of research on durability in world science is briefly presented.

Quantitative Ruthenium Method for Analysis of Nitrogen Ion-Implanted Titanium Alloy (Ti-6AI-4V) and the Effect on Bacterial Adherence

1991 ◽  
Vol 252 ◽  
Author(s):  
Beverly L. Giammara ◽  
James M. Williams ◽  
David J. Birch ◽  
Joanne J. Dobbins
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Titanium Alloy ◽  
Ion Implantation ◽  
Growth Period ◽  
Scattered Electron ◽  
Nitrogen Ion Implantation ◽  
Total Fluence ◽  
Nitrogen Ion ◽  
Electron Imaging ◽  
Ion Implanted

ABSTRACTThe effects of nitrogen ion implantation of Ti-6AI-4V alloy on growth of Pseudomonas aeruginosa bacteria on surfaces of the alloy have been investigated. Results for ion implanted samples were compared with controls with similarly smoothly polished surfaces and with controls that had intentionally roughened surfaces. The test consisted of exposing sterile alloy samples to a microbiological broth, to which 24 hour-old cultures of Pseudomonas aeruginosa had been added. After bioassociation at normal temperature 37°C, bacteria adhering to the surface were fixed and treated with a new ruthenium tetroxide staining method, and quantified by use of scanning electron microscopy (SEM), back-scattered electron imaging and EDAX energy dispersive microanalysis. For smooth samples of the alloy, after a 12 hour growth period, the retained bacteria (revealed by the biologically incorporated ruthenium), decreased monotonically with nitrogen dose out to a total fluence of approximately 7 × 1017/cm2 in an affected depth of approximately 0.1500 μm. The SEM confirmed that the Pseudomonas aeruginosa adhered equally to control materials. The ruthenium studies revealed that the amount of bacterial adhesion is indirectly proportional to the nitrogen ion implantation of the titanium. The greater the percentage of nitrogen ion implantation in the titanium alloy, the less bacteria colonized the disk.

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