Investigation of the Structure and Properties of Materials in the SiC ― TiB2 System

The structure and properties of sintered and hot-pressed materials of the SiC TiB₂ system were investigated. The optimal conditions for obtaining dense ceramics with minimum grain size of the phase components was determined. It was established that composites containing from 25 to 50 vol.@percnt; TiB₂ have a bend strength equal to 450 MPa at 20°C; this increases to 500 MPa at 1600°C for ceramics with a pseudoeutectic structure. The material is highly heat resistant in the temperature range 900-1200°C.     

Features of Formation and Properties of Titanium–Aluminum System Laminated Composite Materials with Different Silicon Content

Metallurgist - Formation of laminated composite materials of titanium-aluminum and titanium-foam aluminum are the most promising. The adhesive strength of layers of composite material is determined...     

Self-Propagating High-Temperature Synthesis of the Heterophase Materials in the Zr–Mo–Si–B System: Kinetics and Mechanisms of Combustion and Structure Formation

Russian Journal of Non-Ferrous Metals - The paper is devoted to the study of the combustion kinetics and mechanisms of elemental mixtures in the Zr–Mo–Si–B system, as well as the...     

Investigation into the Formation of Texture,Microstructure, and Anisotropy of Properties during Rolling Sheets of the Aluminum–Lithium 1420 Alloy

Results of investigations into the formation of the crystallographic orientation of the structure and anisotropy of properties during rolling sheets of the aluminum–lithium 1420 alloy of the Al–Mg–Li system are given. Hot-rolled billets of the 1420 alloy were cold-rolled with intermediate quenching according to the following schedule: 7.3 mm → 4.8 mm → 3.0 mm → 1.8 mm. The samples were selected after each passage to perform mechanical testing and analyze the structure using optical microscopy and diffractometry. A deformed fibrous structure and considerable anisotropy of mechanical properties is characteristic of sheets of all considered states. Herewith, the maximal plasticity is observed at an angle of 45° to the rolling direction. The character of anisotropy of properties formed at the hot-rolling stage is not varied during cold rolling. Sheets of the 1420 alloy have a sharp deformation texture at all rolling stages due to the conservation of the unrecrystallized structure. For example, when analyzing pole figures and preferential orientations, an increase in volume fractions of rolling texture is revealed (the slow one of the brass type and more rapid of the S type) with the rise of summary deformations of cold rolling. The recrystallization texture (of the R type) is present in small amounts only after hot rolling. The volume fraction of the texture-free component decreases with an increase in summary deformations. It is concluded based on these results that, in order to decrease the fraction of the deformation texture and lower anisotropy of properties in sheets of the 1420 alloy, it is first and foremost necessary to provide the running of recrystallization at the hot-rolling stage in order to fabricate the recrystallized hot-rolled billet for subsequent cold rolling.     

Investigation of Structure Formation During Ageing of High-Strength Pseudo-β Titanium Alloy VT47

Metallurgist - The morphology and temperature-time ranges of α-phase particle precipitation during ageing of metastable β-titanium alloy VT47 are established. The incubation period of...     

Study of the Structure and Properties of Cermets Based on the NiAl–Al2O3 System

Russian Journal of Non-Ferrous Metals - The powder metallurgy method, including the mechanical activation of powders in a planetary mill and spark plasma sintering at 1470°C in an inert...     

The Structure and Properties of Precipitation-Strengthened Composites Produced From a Cast Alloy in the Al–Si–Mg System

Powder Metallurgy and Metal Ceramics - The properties of precipitation-strengthened composites produced from an aluminum alloy were studied. The composites were prepared by powder and casting...     

Synthesis Features,Structure, and Properties of Promising High-Temperature Ceramics in the Hf–Ta–B–Ti–Si System

Russian Journal of Non-Ferrous Metals - This study covers the elemental synthesis features of Hf–Ta–B–Ti–Si ceramic materials used to obtain promising high-temperature...     

Composition and Crystalline Structure of Ternary Phases in the Ta–Ni–Al System

Russian Journal of Non-Ferrous Metals - The composition and crystal structure of compounds produced by self-propagating high-temperature synthesis (SHS) from the 5Ta–2Ni–3Al (at %)...     

Diffusion of Tin in a Solid Solution of the Copper–Tin System

Russian Journal of Non-Ferrous Metals - Electron probe microanalysis (EPMA) has been used to obtain concentration curves and calculate the bulk diffusion coefficients of Sn in solid solutions of...     

Formation of Titanium Boride in the Surface Layer of an Iron–Carbon Alloy Casting

The main stages of titanium boride formation in alloyed surface layers on iron–carbon alloy castings are considered. Surface alloying was performed by self-propagating high-temperature synthesis in alloying compositions during lost-foam casting. Titanium and ferrotitanium are used in alloying compositions to ensure synthesis, which is initiated by the melt thermal energy during casting formation. The thermal effects of the main reactions of titanium boride formation in various alloying compositions are compared. The microstructure, the phase composition, and the hardness of the alloyed surface layers are studied.     

Electrical Properties of Highly Absorbing Ceramics in the AlN–SiC System

Powder Metallurgy and Metal Ceramics - The electrical properties of two highly absorbing AlN–SiC composites are compared at a frequency of 10.3 GHz. To estimate the dielectric constant and...