Begell House Inc.
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
HTM
1093-3611
21
2
2017
THE ROLE OF THERMAL SPIKES IN RADIATION STABILITY OF METAL NANOWIRES UNDER EXPOSURE TO CONTINUOUS AND POWERFUL PULSED ION BEAMS
91-107
10.1615/HighTempMatProc.2017022843
S. A.
Bedin
Institute of Electrophysics, Ural Branch, Russian Academy of Sciences,
106 Amundsen Str., Yekaterinburg, 620016, Russia
V. V.
Ovchinnikov
Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, 106 Amundsen Str., Yekaterinburg, 620016, Russia; El'tsin Ural Federal University, 19 Mir Str., Yekaterinburg, 620002, Russia
Natali V.
Gushchina
Institute of Electrophysics, Ural Branch, Russian Academy of Sciences,
106 Amundsen Str., Yekaterinburg, 620016, Russia
F. F.
Makhin'ko
Institute of Electrophysics, Ural Branch, Russian Academy of Sciences,
106 Amundsen Str., Yekaterinburg, 620016, Russia
G. E.
Remnev
Research Institute of High Voltage, 30 Lenin Ave., Tomsk, 634050, Russia
S. K.
Pavlov
Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, 106 Amundsen Str., Yekaterinburg, 620016, Russia; Research Institute of High Voltage, 30 Lenin Ave., Tomsk, 634050, Russia
N. N.
Gerasimenko
Institute of Electrophysics, Ural Branch, Russian Academy of Sciences,
106 Amundsen Str., Yekaterinburg, 620016, Russia; National Research University of Electronic Technology (MIET), 1 Shokin Sq.,
Zelenograd, Moscow Region, 124498, Russia
D. L.
Zagorskiy
Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, 106 Amundsen Str., Yekaterinburg, 620016, Russia; Shubnikov Institute of Crystallography of Federal Scientific Research Center "Crystallography and Photonics," Russian Academy of Sciences, 59 Leninsky Ave., Moscow, 119333, Russia; Gubkin Russian State University of Oil and Gas, 65 Leninsky Ave., Moscow, 119991, Russia
nanowires
template synthesis
radiation stability
continuous and powerful pulsed ion beams
thermal spikes
nanoscale dynamic effects
The aim of this work is to investigate radiation stability of nanowires of pure Ni and iron–nickel alloy Fe0.56Ni0.44 (fabricated by matrix synthesis using polymer track membranes) under irradiation with continuous beams of Ar+ and Xe+ ions (E = 20 keV, j = 300 μ;A/cm2) and on exposure to a powerful pulsed 85% C+ + 15% H+ ion beam under conditions of generation of only one ion pulse (E = 250 keV, j = 100 A/cm2, τ = 90 ns). The assumption is made that the thermalized regions of dense cascades of atomic displacements play an important role in changing the structure of nanowires. These regions are nanoscale zones of explosive energy release (thermal spikes) heated
to several thousand degrees (eventually they are observed on the surface of nanowires in the form of nanosized frozen droplets). Calculations have shown that integral heating of nanowires by ion beams in a continuous mode is insufficient for their total melting. The answer to a similar question
about global melting during irradiation in a pulse mode depends on the orientation of nanowires relative to the ion beam. Bending and fracture of nanowires undergone melting can be explained by the propagation of post cascade shock waves.
INVESTIGATION AND OPTIMIZATION OF PROCESS VARIABLES ON CLAD ANGLE IN 316L STAINLESS STEEL CLADDING USING GENETIC ALGORITHM
109-125
10.1615/HighTempMatProc.2017021841
Maruthasalam
Sowrirajan
Department of Mechanical Engineering, Coimbatore Institute of Engineering
and Technology, Coimbatore 641109, Tamil Nadu, India
P. Koshy
Mathews
Department of Mechanical Engineering, Kalaivani College of Technology, Coimbatore 641105, Tamil Nadu, India
S.
Vijayan
Department of Mechanical Engineering, Coimbatore Institute of Engineering
and Technology, Coimbatore 641109, Tamil Nadu, India
heat transfer
thermal conductivity
clad angle
response surface methodology
genetic algorithm
Cladding is the process of depositing a layer of material over another material to enhance various surface properties such as corrosion resistance and wear resistance. In this work, the process of metal cladding is involved to conserve a quantity of heat energy. It is done by surfacing a low
thermal conductivity material over a high thermal conductivity boiler material. Austenitic stainless
steel of grade 316L is deposited over IS:2062 structural steel plates using FCAW process. Five important parameters are selected, as well as five factors and five levels of rotatable central composite design are used for experimentation. A careful experimental study is carried out on clad angle, an important geometry relates to the clad height and clad width. A mathematical model has been
developed for predicting the clad angle and tested for adequacy with the help of the ANOVA technique. Direct and interaction effects of process parameters on clad angle are discussed elaborately since the clad layer plays a direct role in the rate of heat transfer. Constrained optimization is carried out using genetic algorithm to yield optimum set of process variables for the response clad angle. The findings have wide industrial applications in the field of surfacing.
EFFECT OF DIELECTRIC BARRIER DISCHARGE PLASMA TREATMENT ON THE PHOTOLUMINESCENCE AND PHOTOCATALYTIC PROPERTIES OF ZnO POWDER
127-142
10.1615/HighTempMatProc.2017024734
Natalie A.
Savastenko
Belorussian State University, International Sakharov Environmental Institute
BSU, Minsk, Belarus
I. I.
Filatova
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost Ave., Minsk, 220072, Belarus
Veronika A.
Lyushkevich
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost Ave., Minsk, 220072, Belarus
N. I.
Chubrik
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost Ave., Minsk, 220072, Belarus
S.V.
Goncharik
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68 Nezavisimost Ave., Minsk, 220072, Belarus
S. A.
Maskevich
Belorussian State University, International Sakharov Environmental Institute
BSU, 23 Dolgobrodskaya Str., Minsk, 220070, Belarus
ZnO-based photocatalysts
plasma treatment
dielectric barrier discharge
photoluminescence
methyl orange
photodegradation
A dielectric barrier discharge (DBD) plasma was applied to treat commercially available ZnO powders. The performance of untreated and plasma-treated ZnO photocatalysts is discussed
in the light of their application for photodegradation of organic pollutants. The photocatalytic activities of plasma-treated and untreated ZnO powders were evaluated by measuring the photodegradation of methyl orange (MO) in aqueous solution exposed to ultraviolet (UV) light.
The MO concentration in solution was measured spectrophotometrically (UV-Vis spectrophotometry).
The photocatalytic activity, expressed in terms of the methyl orange photodegradation rate, was 2.2 times higher for the plasma-treated sample than for the untreated one. In
addition, the kinetic process of photocatalytic degradation of MO was also examined, and the degradation of MO was found to follow a first-order rate law. The results imply that different mechanisms are involved in the decomposition of methyl orange on untreated and plasmatreated catalysts. The samples were also characterized by photoluminescence (PL) spectroscopy. Room temperature PL spectra of ZnO powders displayed two emission bands: excitonic UV emission, and deep level visible emission. Characterization of the ZnO powders by means of photoluminescence indicated that plasma treatment leads to an increase in the UV excitonic
emission. The increasing photocatalytic activity after plasma treatment can be attributed to the increased optical quality of ZnO.
PLASMA EMISSION SYSTEMS FOR ELECTRON- AND ION-BEAM TECHNOLOGIES
143-159
10.1615/HighTempMatProc.2017024672
D.
Antonovich
Polotsk State University, 29 Blokhin Str., Novopolotsk, 211440, Belarus; Vitebsk State University named after P.M. Masherov, 33 Moskovskiy Ave., Vitebsk, 210038, Belarus
V.
Gruzdev
Polotsk State University, 29 Blokhin Str., Novopolotsk, 211440, Belarus
V.
Zalesski
Physical-Technical Institute, National Academy of Sciences of Belarus,
10 Academician Kuprevich Str., Minsk, 220141, Belarus
Igor
Pobol
Physical Technical Institute, National Academy of Sciences of Belarus,
10 Academician Kuprevich Str., Minsk, 220141, Belarus
Pavel
Soldatenko
Polotsk State University, 29 Blokhin Str., Novopolotsk, 211440, Belarus
plasma electron source
low-energy beams
combined ion and electron beams
electron-beams technologies
Designs and basic characteristics of plasma sources of charged particles allowing one to realize a wide spectrum of electron- and ion-beam technologies are presented. Some applications of the developed structures of charged particles sources are considered. Sketches of promising designs of gas-discharge structures capable of forming combined electron and ion beams are proposed.
SELECTIVE LASER MELTING OF the Ti–(40–50) wt.% Nb ALLOY
161-183
10.1615/HighTempMatProc.2017024814
Yu. P.
Sharkeev
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 2/4 Akademicheskii Ave., Tomsk, 634055, Russia; National Research Tomsk Polytechnic University, 30 Lenin Ave., Tomsk,
634050, Russia
A. I.
Dmitriev
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 2/4 Akademicheskii Ave., Tomsk, 634055, Russia; National Research Tomsk Polytechnic University, 30 Lenin Ave., Tomsk,
634050, Russia
Anna G.
Knyazeva
Institute of Strength Physics and Materials Science of Siberian Branch of Russian
Academy of Sciences (ISPMS SB RAS), Tomsk 634055, Russia
A. Yu.
Eroshenko
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 2/4 Akademicheskii Ave., Tomsk, 634055, Russia
A. A.
Saprykin
National Research Tomsk Polytechnic University, 30 Lenin Ave., Tomsk, 634050, Russia
M. A.
Khimich
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 2/4 Akademicheskii Ave., Tomsk, 634055, Russia; National Research Tomsk State University, 36 Lenin Ave., Tomsk, 634050,
Russia
E. A.
Ibragimov
National Research Tomsk Polytechnic University, 30 Lenin Ave., Tomsk, 634050, Russia
I. A.
Glukhov
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 2/4 Akademicheskii Ave., Tomsk, 634055, Russia
A. M.
Mairambekova
National Research Tomsk State University, 36 Lenin Ave., Tomsk, 634050, Russia
A. Yu.
Nikonov
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 2/4 Akademicheskii Ave., Tomsk, 634055, Russia; National Research Tomsk State University, 36 Lenin Ave., Tomsk, 634050,
Russia
Ti–Nb alloy
selective laser melting
modeling
microstructure
phase composition
mechanical properties
microscale and macroscale levels
Experimental macrosamples of Ti–(40–50) wt.% Nb alloy were produced using a method of selective laser melting (SLM) from a Ti and Nb composite powder obtained by mechanical alloying in a highenergy planetary ball mill from pure titanium and niobium powders. The SLM process of a Ti–Nb alloy was modeled on micro- and macroscale levels. The necessity of additional heating the powder layer and substrate for successful occurrence of the SLM process on the microscale level was shown. Based on the calculations of the temperature field of the powder layer in the course of the SLM process, the modes and parameters of the SLM process required for the production of macrosamples of Ti–Nb system alloys were determined and specified. The Ti–45 wt.% Nb and Ti–48 wt.% Nb alloys formed as a result of SLM have a two-phase state. This state is represented by the matrix phase of β-bcc solid solution of titanium and niobium and by the nonequilibrium martensite α''-phase.