Microdistortions,Hardness, and Young’s Modulus of Multicomponent Bcc Solid Solutions

Powder Metallurgy and Metal Ceramics - The phase composition, type II microstresses, and coherent scattering domains (CSDs) of multicomponent (medium- and high-entropy) bcc solid solutions with an...     

The Effect of Composition on the Formation of a BCC Approximant in Ti–Cr–Al–Si–O Alloys

Powder Metallurgy and Metal Ceramics - The microstructure, phase composition, and mechanical properties of Ti–Cr–Al–Si–O alloys in ascast state and after annealing at...     

Corrosion of Titanium-Aluminum Intermetallides. Part 2. Electrolytic Oxidation of γ‐TiAl,TiAl3, and α2‐Ti3Al in Sea Water

Potentiodynamic polarization, XRD, Auger electron spectroscopy, and scanning electron microscopy have been applied to determine the mechanisms of electrolytic corrosion of the intermetallides TiAl, TiAl₃, and ₂Ti₃Al in 3% NaCl solution with the addition of MgSO₄ in comparison with the corrosion of the pure metals (Al and Ti). There is comparatively high corrosion resistance in TiAl and Ti₃Al because of the protective action from thin films of rutile TiO₂. Evidence is obtained for the differences between these intermetallides from the appearance of pure titanium on deep anodic polarization (above +0.15 V for TiAl and +0.7 V for Ti₃Al): the aluminum and titanium enter the solution in the forms of Al³⁺ and TiO²⁺ and intermetallides dissolve rapidly. The final solid-state products from anodic oxidation in that case are rutile, magnesium aluminate, and also magnesium and sodium titanates. In addition to pure titanium, TiAl and ₂Ti₃Al as constructional materials may be recommended for use in sea water.     

Effect of annealing on the microstructure, room-temperature strength, and fracture toughness of Al2O3−ZrO2−TiN ceramics

The microstructure, phase composition, room-temperature flexural strength, and fracture toughness of Al₂O₃−ZrO₂−TiN (AZT) ceramics were studied on specimens annealed in air at 1000, 1200, and 1400°C. The strength of the ceramics decreased with annealing temperature. The degradation in strength was caused by defects formed on or near the surface of the ceramics during oxidation of TiN which started at 600–700°C. The surface defects after annealing are influenced by the formation of rutile (TiO₂) at 1000 and 1200°C, aluminum titanate (Al₂TiO₅), and titanium suboxide Ti₅O₉ at 1400°C as well as by diffusion processes associated with ZrO₂. If the annealing of smooth AZT specimens in air resulted in lower strength, specimens in the form of single-edge notched beam (SENB) exhibited a considerable increase in fracture toughness (K _Ic) with annealing temperature. Such behavior was caused by the formation of an oxide layer which hindered the propagation of the main crack from the notch base. Thermal treatment of the smooth AZT specimens and further edge notching and testing did not result in a change of K _Ic values. The Al₂O₃ and Al₂O₃−ZrO₂ ceramics were also tested for comparison. Translated from Problemy Prochnosti, No. 1, pp. 132–138, January–February, 1999.     

Modeling of the ductile-brittle transition in porous metallic materials under conditions of crack resistance tests

Translated from Poroshkovaya Metallurgiya, No. 5(329), pp. 85–92, May, 1990.     

Size effect in the micro- and nanoindentation and its compensation with regard for the specific features of initial contact

The diagram of penetration recorded in the course indentation is represented in the form of a quadratic function with the origin of coordinates shifted to the left along the abscissa. This models the smooth character of penetration of an indenter in its initial contact with the surface. The recorded depth of penetration increases by the length of the shift. The application of the quadratic function and the corrected depth of penetration guarantees that the values of hardness are constant under various loads. Translated from Problemy Prochnosti, No. 2, pp. 43–54, March–April, 2009.