Structural-Phase State of UFG-Titanium Implanted with Aluminum Ions

2020 ◽  
Vol 303 ◽  
pp. 161-168
Author(s):  
Alisa V. Nikonenko ◽  
Natalya A. Popova ◽  
E.L. Nikonenko ◽  
M.P. Kalashnikov ◽  
I.A. Kurzina
Keyword(s):  
Grain Size ◽  
Yield Stress ◽  
Phase State ◽  
Structural Phase ◽  
Ion Source ◽  
Anisotropy Factor ◽  
Structural Phase State ◽  
Aluminum Ions ◽  
Average Grain Size ◽  
Before And After

Transmission electron microscopy investigations were carried out to study the structural-phase state of ultra-fine grain (UFG) titanium with the average grain size of ~0.2 μm, implanted with aluminum ions. Implantation was carried out on MEVVA-V.RU ion source at room temperature, exposure time of 5.25 h and ion implantation dosage of 1⋅1018 ion/cm2. UFG-titanium was obtained by a combined multiple uniaxial compaction with rolling in grooved rolls and further annealing at 573 К for 1h. The specimens were investigated before and after implantation at a distance of 70-100 nm from the specimen surface. Concentration profile of aluminum implanted with α-Ti was obtained. It was revealed that the thickness of implanted layer was 200 nm, while maximum aluminum concentration was 70 at.%. Implantation of aluminum into titanium has resulted in formation of the whole number of phases having various crystal lattices, like β-Ti, TiAl3, Ti3Al, TiC and TiO2. The areas of their localization, the sizes, distribution density and volume fractions were determined. Grain distribution functions by their sizes were built, and the average grain size was defined. The paper investigates the influence of implantation on the grain anisotropy factor. It was revealed that implantation leads to the decrease in the average transverse and longitudinal grain size of α-Ti and decrease in the anisotropy factor by three times. The yield stress and contributions of separate strengthening mechanisms before and after implantation were calculated. The implantation has resulted in increase in the yield stress by two times.

Influence of implantation on the grain size and structural-phase state of UFG-titanium

2019 ◽  
Author(s):  
Alisa Nikonenko ◽  
Natalya Popova ◽  
Elena Nikonenko ◽  
Mark Kalashnikov ◽  
Irina Kurzina
Keyword(s):  
Grain Size ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State

scholarly journals VT6 TITANIUM ALLOY WEARABILITY INCREASE VIA IMPLANTATION OF COPPER AND ALUMINUM IONS

2019 ◽  
Vol 16 (32) ◽  
pp. 945-966
Author(s):  
V. V. OVCHINNIKOV ◽  
N. V. UCHEVATKINA ◽  
I. A. KURBATOVA ◽  
E. V. LUKYANENKO ◽  
S. V. YAKUTINA
Keyword(s):  
Titanium Alloy ◽  
Phase State ◽  
Copper Ions ◽  
Structural Phase ◽  
Intermetallic Phases ◽  
Surface Layers ◽  
Structural Phase State ◽  
Mechanical And Tribological Properties ◽  
Aluminum Ions ◽  
Implantation Process

The relevance of the article is due to the fact that the use of titanium alloys within friction joints is restrained by their low resistance to wear while traditional methods of increasing their wear resistance are ineffective. The objective of this work was to study the processes occurring on the surface of VT6 titanium alloy samples when implanting with copper and aluminum ions, as well as in friction. Elemental composition, structural-phase state, mechanical and tribological properties of VT6 titanium alloy surface layers modified by aluminum and copper ions during the high-intensity ion-implantation process was being researched. As can be seen from the undertaken studies, the mode of the high-intensity ion-implantation process makes it possible to obtain ion doped surface layers of VT6 alloy containing TiAl, Ti3Al, Ti3Cu, Ti2Cu, TiCu finely dispersed intermetallic phases and a solid solution of aluminum and copper in titanium of composition varying in depth. The thickness of the ion-doped layer, the average grain size of the intermetallic phases (from 18 to 55nm) and their conglomerates (from 45 to 280 nm) increases with the increase in implantation dose from 2⋅1017 to 1.2⋅1019 ion/cm2 while aluminum implantation (from 0.42 to 2.1 μm) is in progress. It has been shown that the implantation of aluminum and copper ions into VT6 alloy leads to a considerable increase in its microhardness and wearability. Based on the research results, a conclusion on the positive effect of a structural-phase state of ion-doped titanium layers on their mechanical and tribological properties of VT6 titanium alloy has been drawn.

scholarly journals STRUCTURAL-PHASE STATE OF UFG TITANIUM IMPLANTED WITH ALUMINUM IONS

2019 ◽  
Vol 21 (4) ◽  
pp. 17-25
Author(s):  
Alisa Nikonenko ◽  
Nataliya Popova ◽  
Elena Nikonenko ◽  
Mark Kalashnikov ◽  
Efim Oks ◽  
...  
Keyword(s):  
Phase State ◽  
Structural Phase ◽  
Structural Phase State ◽  
Aluminum Ions

Formation of Fe2Si Wetting Coating on Si(001) 2×1 and Growth of a Stable Fe Nanolayer: AES and EELS Study

2020 ◽  
Vol 312 ◽  
pp. 9-14
Author(s):  
Nikolay I. Plusnin ◽  
Andrey M. Maslov ◽  
Vladimir M. Il’yashenko
Keyword(s):  
Electron Spectroscopy ◽  
Phase State ◽  
Structural Phase ◽  
Energy Losses ◽  
Two Dimensional ◽  
Auger Electrons ◽  
Structural Phase State ◽  
Before And After ◽  
The One

The structural-phase state of two-dimensional (d = 1 - 3 ML) coatings before and after annealing and that of Fe nanolayers (d = 4 - 10 ML) were investigated on Si (001)2×1 by electron spectroscopy methods of Auger-electrons and energy losses. The room (30 °С) and lowed (≤ 1250 °С) temperatures of the Si (001) substrate and Fe vapor, respectively, were used during Fe deposition. This study showed the following. An ordered two-dimensional 1×1 phase of Fe stable up to 600 °C and then a Fe2Si wetting coating stable at 250 °C form near the thickness 1 ML and 3 ML, respectively. Fe deposition on this Fe2Si coating leads to the one-after-another formation of the Fe3Si, the Si-in-Fe solution, and then a stable up to 250 °C Fe nanofilm with segregated Si.

Structural-Phase State and Strength Properties of Pressure-Synthesized Ni3Al Intermetallic Compound

2017 ◽  
Vol 906 ◽  
pp. 95-100 ◽  
Author(s):  
V.E. Ovcharenko ◽  
E.N. Boyangin ◽  
A.P. Pshenichnikov ◽  
T.A. Krilova
Keyword(s):  
Grain Size ◽  
Intermetallic Compound ◽  
Powder Mixture ◽  
Delay Time ◽  
Phase State ◽  
Structural Phase ◽  
Strength Properties ◽  
Synthesis Product ◽  
Structural Phase State ◽  
High Temperature Synthesis

The article studies dependences of grain size in Ni3Al intermetallic compound synthesized under pressure in 3Ni+Al powder mixture in conditions of bulk exothermal reaction upon pre-pressure acting on the powder mixture and upon a delay time of applying pressure to a high-temperature synthesis product. It is proved that an increase in the pre-pressure on the parent powder mixture reduces the grain size, and an increase in the delay time increases the grain size in the synthesized intermetallic compound. Reducing the grain size from 10 to 1.75μm increases the strength of the intermetallic compound under pressure from 336 to 482 MPa (1.4 times).

Influence of the Initial Grain Size on the Structural-Phase State of the VT20 Titanium Alloy Surface after Implantation

2021 ◽  
Vol 1037 ◽  
pp. 535-540
Author(s):  
Viktor Vasilevich Ovchinnikov ◽  
Irina Aleksandrovna Kurbatova ◽  
Elena Vladimirovna Luk'yanenko ◽  
Nadezda Vladimirovna Uchevatkina ◽  
Svetlana Viktorovna Yakutina
Keyword(s):  
Grain Size ◽  
Titanium Alloy ◽  
Phase State ◽  
Structural Phase ◽  
Alloy Surface ◽  
Structural Phase State ◽  
Fine Grained ◽  
Ultrafine Grained ◽  
Alloy Vt20 ◽  
Vt20 Titanium Alloy

The article presents the results of studies of titanium alloy VT20 in ultrafine-grained (UFG), subfine-grained (SMG), fine-grained (MZ) and mesopolycrystalline (MPC) states, obtained, including by methods of plastic deformation and subsequently subjected to ion implantation. The effect of grain size on the structural-phase state of the titanium alloy surface and mechanical properties is shown.

Influence of composition on the structural-phase state, electrophysical and magnetotransport properties of alloy thin films based on Co and Cu

Vacuum ◽  
2021 ◽  
Vol 187 ◽  
pp. 110141
Author(s):  
I.O. Shpetnyi ◽  
I.Yu Protsenko ◽  
S.I. Vorobiov ◽  
V.I. Grebinaha ◽  
L. Satrapinskyy ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State
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