scholarly journals Structure of tantalum coatings on NiTi substrate deposited by magnetron sputtering

2022 ◽  
Vol 2155 (1) ◽  
pp. 012013
Author(s):  
A S Dikov ◽  
A S Larionov ◽  
E A Zhakanbayev ◽  
L A Dikova ◽  
A Zh Sanssyzbayeva ◽  
...  
Keyword(s):  
Shape Memory ◽  
Phase State ◽  
Structural Phase ◽  
Interplanar Distance ◽  
X Ray Diffraction ◽  
Two Phase ◽  
Structural Phase State ◽  
Initial Stage ◽  
Coating Formation ◽  
Tantalum Coatings

Abstract The paper provides the results of studies of the structural-phase state of tantalum coatings prepared by magnetron deposition. The coatings were deposited on substrates made of titanium nickelide with a shape memory. The NiTi temperature during coating deposition did not exceed 100 °C. The structural-phase state of Ta was determined by X-ray diffraction at different stages of coating formation. It has been shown that at the initial stage of deposition, two-phase coatings (α- and β-Ta) are formed. The synthesis of the coating from Ta leads to the growth of interplanar distance of the B2 austenite phase in the crystallographic direction (100). The growth of interplanar spacing is caused by formation of microstresses during interaction with incident tantalum ions. The lattice parameters of the B19 ‘phase, responsible for appearance of the shape memory effect, do not change during deposition of the tantalum coating.

scholarly journals Influence of the initial structural-phase state on inelastic and plastic strains behavior in coarse-grained samples of the Ti49.3Ni50.7 (at.%) alloy

2022 ◽  
Vol 1213 (1) ◽  
pp. 012004
Author(s):  
D Yu Zhapova ◽  
A I Lotkov ◽  
V N Grishkov ◽  
A A Gusarenko ◽  
I S Rodionov
Keyword(s):  
High Temperature ◽  
Deformation Behavior ◽  
Phase State ◽  
Structural Phase ◽  
Inelastic Strain ◽  
Coarse Grained ◽  
Plastic Strains ◽  
Two Phase ◽  
Structural Phase State ◽  
Maximum Value

Abstract The paper presents the experimental results of studies of the temperature dependence of inelastic and plastic strains during torsion of coarse-grained samples of the Ti49.3Ni50.7 (at.%) alloy. Investigations of the deformation behavior of the test alloy samples in the martensitic, two-phase and high-temperature states have been carried out. It is shown that the value of the summary inelastic strain reaches a maximum value of ∼ 18% under deformation of the samples in the martensitic and two-phase state, as well as in the temperature range of pre-transition phenomena.

Electron-Beam Welding - Structural-Phase State and Microhardnes in the Weld Zone in a Submicrocrystalline Titanium Alloy Grade2

2017 ◽  
Vol 906 ◽  
pp. 32-37 ◽  
Author(s):  
Vasilii A. Klimenov ◽  
Anatolii A. Klopotov ◽  
Yu.A. Abzaev ◽  
K.A. Kurgan ◽  
Yu.A. Vlasov
Keyword(s):  
Titanium Alloy ◽  
Heat Affected Zone ◽  
Phase State ◽  
Electron Beam Welding ◽  
Structural Phase ◽  
Weld Zone ◽  
X Ray Diffraction ◽  
Structural Phase State ◽  
X Ray ◽  
Microhardness Distribution

The paper presents the results of the X-ray diffraction analysis of structural-phase states in the weld zone of a titanium alloy Grade2 in micro-and submicrocrystalline states. It is established that the structural-phase state in the weld zone and in the heat-affected zone depends on the state of samples of the alloy Grade2 before welding. It is shown that formation process of metastable phases ω-Ti and α′′-Ti occurs in the submicrocrystalline state in the alloy Grade2 in the weld zone and in the heat-affected zone. Investigations of the features of the microhardness distribution in the weld zone in alloys Grade2 in micro-and submicrocrystalline states are carried out. Different character of microhardness distributions in the weld zone in the samples depending on the structural-phase state of welded plates made of alloy Grade2 is determined.

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

Influence of ball milling duration on the morphology, features of the structural-phase state and microhardness of 3Ni-Al powder mixture

2021 ◽  
Author(s):  
Ivan A. Ditenberg ◽  
Denis A. Osipov ◽  
Michail A. Korchagin ◽  
Ivan V. Smirnov ◽  
Konstantin V. Grinyaev ◽  
...  
Keyword(s):  
Ball Milling ◽  
Powder Mixture ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State ◽  
Milling Duration ◽  
Al Powder

Crystallization of Amorphous Sputtered NiTi Shape-Memory Alloy Films

1995 ◽  
Vol 398 ◽  
Author(s):  
F.F. Gong ◽  
H.M. Shen ◽  
Y.N. Wang
Keyword(s):  
Shape Memory ◽  
Annealing Temperature ◽  
Optimum Shape ◽  
Niti Shape Memory Alloy ◽  
X Ray Diffraction ◽  
Initial Stage ◽  
Average Grain Size ◽  
Optimum Heat ◽  
Diffraction Patterns ◽  
Optimum Heat Treatment

ABSTRACTThe crystallization of amorphous sputtered NiTi films was investigated for selected heat treatments. From x-ray diffraction patterns, when the films were annealed below the crystallization temperature, the intensity of the broad maximum centered at 2θ = 43.5° increased with increasing the annealing temperature and time. When the films were annealed at 550°C for 0.5hr, parent B2 phase and Ni4Ti3 precipitates appeared. For annealing temperature above 700°C, the films showed embrittlement and volatilization. Therefore the optimum heat treatment for the optimum shape memory effect is found. The average grain size increased slowly in the initial stage of annealing but remained almost unchanged when the films were annealed for more than 1hr. This is because the grain boundary grooving caused by the titanium at a certain temperature volatilization seriously hinder the grain growth.

Effect of Alloying Elements on the Structural Phase State of Hadfield Steel

2021 ◽  
Vol 33 (11) ◽  
pp. 04021324
Author(s):  
Almira Zhilkashinova ◽  
Mazhyn Skakov ◽  
Madi Abilev ◽  
Dossym Yerbolatuly
Keyword(s):  
Phase State ◽  
Structural Phase ◽  
Alloying Elements ◽  
Hadfield Steel ◽  
Structural Phase State ◽  
Effect Of Alloying

scholarly journals Influence of electrolytic plasma nitriding mode on structural phase state of pearlitic steel

2018 ◽  
Vol 143 ◽  
pp. 03004
Author(s):  
Natalya Popova ◽  
Lyudmila Erygina ◽  
Elena Nikonenko ◽  
Mazhin Skakov
Keyword(s):  
Phase State ◽  
Plasma Nitriding ◽  
Water Solution ◽  
Lath Martensite ◽  
Structural Phase ◽  
Pearlitic Steel ◽  
Parallel Plates ◽  
Structural Phase State ◽  
Original State ◽  
Α Phase

The paper describes results of studies of phase transitions in structural phase state occurring in the type 0.34C-1Cr-1Ni-1Mo-Fe steel under electrolytic plasma nitriding in nitrogen-containing water solution. The nitriding voltages considered in the given study were 550 and 600 V. The research was conducted by means of X-ray diffraction electron microscopy. The specimens were studied in two states : 1) before modification (original state) and 2) after nitriding in the surface layer of the specimen. The study was conducted on thin foils. It was found that nitriding lead to significant changes in the structure of steel, namely in its phase composition and in the number of existing phases. In the original state the structure of steel was given as lamellar pearlite, ferritic carbide mix and fragmented ferrite. After 550 V nitriding it was lath martensite, plates of α-phase, with colonies of thin parallel plates of γ-phase and coarse grains of α-phase, containing γ-phase grains which were different in size and shape and were various-directional. Increase in nitriding voltage up to 600 V lead to change in the structure given as a lamellar non-fragmented pearlite and fragmented ferrite. The original state was marked by presence of particles of M3C cementite, after nitriding irrespective of the voltage it had the particles of M3C alloyed cementite, Fe3Mo3N nitride and Cr2C0.61N0.39 carbonitride. The sizes, volume fractions and locations of particles were dependent on nitriding voltage.

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