The Influence of Structure and Phase Composition of Titanium Alloy on Superplastic Deformation

Russian Physics Journal - The paper presents research into the behavior of high-temperature plastic deformation of titanium alloy Ti–4.74 wt.% Al–5.57 wt.% Mo–5.04 wt.% V alloy...     

Thermal Stability of the Structure and Phase Composition of Titanium Treated with Compression Plasma Flows

The results of studying the structure and phase composition of the surface layer of commercial pure VT1-0 titanium treated with compression plasma flows in nitrogen atmosphere and annealed in the temperature range of 400–900°C for 1 h are presented. Using the X-ray diffraction method, the α-Ti(O) solid solution is found to form in the titanium surface layer at 500°C, without pretreatment with plasma, and to transform into the titanium oxide TiO₂ (rutile) phase at 600°C. Pretreatment of titanium with compression plasma flows promotes the formation of α-Ti(N) solid solution decreasing the rate of surface oxidation and increasing the initial temperature of rutile formation to 700°C, which indicates enhancement of the thermal stability of this structure.     

Structure and Phase Composition of Heat-Affected Zone of Austenite Steel After Deformation

Russian Physics Journal - The paper presents the transmission electron microscopy (TEM) investigations of the thin film structure and phase composition of the heat-affected zone (HAZ) of a weld...     

Phase Composition of Ultra-Fine Grain Titanium After Aluminum Ion Implantation

Russian Physics Journal - The paper investigates commercially pure titanium VT1-0 (US analog Grade 2) in the ultrafine grain state after the aluminum ion implantation at a fluence of 1?1017,...     

Structure and Properties of Titanium Aluminum Alloy Produced by Friction Stir Welding

Russian Physics Journal - The paper deals with the fabrication of lap joints of titanium ОТ4-1 alloy and aluminum AlMg5 alloy sheets by means of friction stir welding (FSW). The X-ray...     

Effect of Particle Size and Phase Composition of Titanium Dioxide Nanoparticles on the Photocatalytic Properties

Titanium dioxide (TiO₂) nanoparticles were prepared by the oxidation of titanium tetrachloride (TiCl₄) in a diffusion flame reactor. The average diameter of particles was 15–30 nm and mass fraction of anatase ranged from 40% to 80%. Effects of particle size and phase composition of those TiO₂ nanoparticles on photocatalytic properties such as decomposition of methylene blue, bacteria and ammonia gas were investigated. The degree of decomposition of methylene blue by the TiO₂ nanoparticles under the illumination of the black light was directly proportional to the anatase mass fraction, but inversely to the particle size. The decomposition of bacteria and ammonia gas by the TiO₂ nanoparticles under the illumination of the fluorescent light showed the same trend as in the case of the methylene blue.     

Kinetics of the Titanium Alloy Structure at High-Speed Penetration of a Striker

Physics of the Solid State - Behavior of a titanium alloy is studied under conditions of a high-speed penetration at a speed of ~2.0 km/s. Three penetration zones with different mechanisms of...     

Phase Composition and Thin Structure of Steel Surface after Plasma Electrolytic Carbonitriding

Russian Physics Journal - Using the transmission electron microscopy of thin foils the paper studies the phase composition and fine structure of 0.18С–1Cr–3Ni–1Mo–Fe...     

Structure and Phase Composition of Ferriticperlitic Steel Surface after Electrolytic Plasma Quenching

Russian Physics Journal - The paper presents the transmission electron microscopy investigations of the structure and phase composition of ferritic-perlitic ST2 steel surface after electrolytic...     

Influence of Annealing on the Structure and Mechanical Properties of Ultrafine-Grained VT22 Titanium Alloy

Russian Physics Journal - Studies of the evolution of the structural-phase state and changes in the mechanical properties of the ultrafine-grained alloy VТ22 after annealing in the...     

Melting of a Titanium Alloy Under the Action of Electrical Discharges of Different Duration

Russian Physics Journal - This work is dedicated to a study of the influence of the duration of an electrical discharge on the size of the melting zone formed at a cathode of VT20 titanium alloy....     

金属火灾熔痕的显微组织及物相成分的实验研究

利用X-射线衍射(XRD)和3D图像处理软件(Image-pro)研究了四种不同火灾类型金属熔痕的显微组织、平均晶粒度、物相组成及其分布规律。结果表明：金属火灾熔痕主要由立方晶系的Cu₂O和胞、枝状的Cu组成。在四种不同的起火方式下,金属熔痕的显微组织和成分有显著的差别：(1)一次短路的火灾熔痕平均晶粒度为3～5 μm,其Cu₂O含量最低;过载熔痕的平均晶粒度与一次短路的类似,但其Cu₂O含量为30%左右;(2)二次短路熔痕中含有一定数量直径较大的微观空洞,平均晶粒度约为30 μm;其Cu和Cu₂O衍射峰出现展宽和辟裂,烧蚀程度最深;(3)火灾熔痕中粗大的Cu₂O等轴晶衍射峰强度最大,且显微组织中几乎没有微观空洞存在。     

Dynamic Strength of a Titanium Alloy with an Electron-Beam-Modified Surface

Data are presented of plane-wave experiments aimed at determining the dynamic strength of 3M titanium alloy with a surface processed by a microsecond electron beam. It has been found that the dynamic strength of processed specimens is higher than that of unprocessed specimens. Metallographic examination of test specimens has revealed spallation macrofracture inside the unprocessed specimens and spallation microfracture at the interface between the hardened layer and the substrate in the beam-processed specimens.     

Service Life Effect on Structure and Phase Composition of DIN 14MoV63 Steel

Russian Physics Journal - The paper studies the structure and phase composition of steel 0.12C–1Cr–1Mo–1V–Fe (grade DIN 14MoV63) after a long-term operation using the...     

Evolution of Structure and Properties of Ni47Mn42In11 Alloy after Plastic Deformation

Physics of the Solid State - Results of the study of the effect of various types of plastic deformation on microstructural features and change in physical and mechanical properties of the...     

Wavelength-Multiplexing Diffractive Phase Element with Quantized Phase Structure

We have reported on the design algorithm of the wavelength-multiplexing diffractive phase element (WMDPE) capable of generating independent spot patterns for more than two wavelengths. [J. Opt. Soc. Am. A 18 (2001) 1082] In this paper, the stepwise quantization method proposed by F. Wyrowski [J. Opt. Soc. Am. A 7 (1990) 961] is built into the algorithm to design the WMDPE with quantized phase structure. Validity of the method is verified by the WMDPE for 7 wavelengths with 9 phase levels. The optical experiment demonstrates that the fabricated WMDPE generates correct patterns for different wavelengths. Performance dependence of the WMDPE on the number of quantized phase levels is discussed based on the simulation results.This paper was originally presented at the 2nd International Conference on Optical Design and Fabrication, ODF2000 which was held on November 15-17, 2000 at the International Conference Center, Tokyo, Waseda University, Japan.