Determination of the critical brittleness temperature in impact binding

Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 27, No. 2, pp. 70–74, March–April, 1991.     

Effect of cooling rate during solidification on the structure of high-speed steel powder particles

Conclusions As a result of a higher rate of cooling the amount of metastable M₂C carbide inclusions in the structure of P/M R6M5F3 steel increases and the degree of bulk alloying of its grains grows. The increase in the microhardness of powder particles brought about by cooling at a higher rate is due to the formation of finer carbide inclusions during solidification, grain refinement, and an increased degree of alloying of the and solid solutions being formed.Translated from Poroshkovaya Metallurgiya, No. 3(267), pp. 6–10, March, 1985.     

Microstructural features of failure surfaces and low-temperature mechanical properties of Ti-6Al-4V ELI ultra-fine grained alloy

Microstructural regularities of failure surfaces and low-temperature mechanical characteristics in quasistatic uniaxial tension and compression have been studied for ultra-fine grained structural states of Ti-6Al-4V ELI alloy processed by equal channel angular pressing. Values of the yield stress and uniform strain at 300, 77, and 4.2 K have been compared for structural states of the Ti-6Al-4V ELI alloy that differ in the average grain size and the morphology of α and β phases. Statistical distributions of dimple sizes on the failure surfaces have been studied for different structural states and temperatures. __________ Translated from Problemy Prochnosti, No. 1, pp. 81–84, January–February, 2008.     

Strengthening and simultaneous neutralization of alumosilicate soils contaminated with heavy metals and petroleum products

The feasibility of strengthening soils contaminated with heavy-metal ions (HMI) and their simultaneous neutralization is examined. Phosphate systems are analyzed thermodynamically on the basis of the parameter ΔG^o _{298_}, which is indicative of possible soil stabilization. Concentration limits of contamination are determined, and mechanisms responsible for neutralization with simultaneous stabilization are analyzed. __________ Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 2, pp. 17–20, March–April, 2008.     

Reflection of light by composite volume holograms: Fresnel corrections and Fabry-Perot spectral filtering

Effects in composite volume Bragg gratings (VBGs) are studied theoretically and experimentally. The mathematics of reflection is formulated with a unified account of Fresnel reflections by the boundaries and of VBG reflection. We introduce the strength S of reflection by an arbitrary lossless element such that the intensity of reflection is R=tanh(2) S. We show that the ultimate maximum/minimum of reflection by a composite lossless system corresponds to addition/subtraction of relevant strengths of the sequential elements. We present a new physical interpretation of standard Fresnel reflection: strength for TE or for TM reflection is given by addition or by subtraction of two contributions. One of them is an angle-independent contribution of the impedance step, while the other is an angle-dependent contribution of the step of propagation speed. We study an assembly of two VBG mirrors with a thin immersion layer between them that constitutes a Fabry-Perot spectral filter. The transmission wavelength of the assembly depends on the phase shift between the two VBGs. Spectral resolution Deltalambda(FWHM)=25 pm at lambda=1063.4 nm is achieved with the device of small total physical thickness 2L=5.52 mm.     

Evaporation time during drying of a drop of solution of entobacterin bacterial preparation

An analytical solution of the problem is obtained which allows one to determine the duration of the process of drying a drop when the moisture content in the drop varies linearly and exponentially. The results are compared with experimental data.