In the present work, new possibilities of the X-ray diffraction for investigations of the 17 phase composition, size, shape and volume fraction of particles in ultrafine-grained (UFG) 18 martensitic steel and the Cu-Cr-Zr alloy have been demonstrated. For the first time, the method of 19 X-ray diffraction in the transmission mode was used to identify particles with a volume fraction of 20 less ...

As a kind of cost-efficient hydrogen storage materials with high hydrogen capacity and light weight, Mg-based alloys have attracted much attention. This review introduces an effective technique in producing bulk ultrafine-grained (UFG) Mg alloys and promoting its hydrogen storage property, namely, equal-channel angular pressing (ECAP). This paper briefly describes the technical principle of ECA...

Two different types of shear bands generate in ultrafine-grained (UFG) CoCrFeMnNi high-entropy alloys deformed at 77 K, i.e. commonly-observed low angle grain boundary (LAGB) type and unusual twin-coupled type. Twin-coupled exhibit a misorientation 56–67° with the matrix, contrast to LAGB band 6–12°. Both annealing twins deformation can act as precursor for bands, where dislocation accumulation...

This paper summarizes recent efforts to evaluate the potential for the formation of a metal matrix nanocomposite (MMNC) by processing two commercial bulk metals of aluminum and magnesium alloy through high-pressure torsion (HPT) at room temperature. After significant evolutions in microstructures, successful fabrication of an Al-Mg hybrid system was demonstrated by observing unique microstructu...

BACKGROUND Ultrafine particles have been hypothesised to be an important contributing factor in the toxicity and adverse health effects of particulate air pollution (PM10) and nanoparticles are used increasingly in industrial processes. AIMS To compare the ability of ultrafine and fine particles of titanium dioxide and carbon black to induce inflammation, cause epithelial injury, and affect t...

Abstract. Grain boundary sliding plays a key role on the high temperature deformation of fine grained materials. This mechanism is related to strain rate sensitivity approximately 0.5 and usually gives rise superplastic elongations. The controlling equation for grain has shown good agreement with experimental data multiple materials, different sizes tested at rates. However, predictive ability ...

This paper aims at investigating the influence of partial replacement of Portland cement with ultrafine fillers compared to limestone powder on the durability and mechanical characteristics of concrete. For this purpose, ultrafine calcium carbonate materials with different specific surface areas of 9.7 and 15.1 m2/g and limestone powder (0.72 m2/g) were used. The results indicate that the ultra...