We describe here for the first time the low temperature superplasticity of nanostructured low carbon steel (microalloyed with V, N, Mn, Al, Si, and Ni). Low carbon nanograined/ultrafine-grained (NG/UFG) bulk steel was processed using a combination of cold-rolling and annealing of martensite. The complex microstructure of NG/UFG ferrite and 50-80 nm cementite exhibited high thermal stability at ...

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...

This paper presents an investigation of the interface quality of nanocristallised 316L stainless steel multilayer structures. They were produced by a duplex process, combining the Surface Mechanical Attrition Treatment (SMAT) and the co-rolling process at two different annealing temperatures (550°C and 650°C). Oxide layers were observed at the interfaces between the sheets and their morphology ...

The paper presents the evaluation of the mechanical and fatigue properties of an ultrafine-grained (UFG) Al 6061 alloy processed by high-pressure torsion (HPT) at room temperature (RT). A comparison is made between the UFG state and the coarse-grained (CG) one subjected to the conventional aging treatment Т6. It is shown that HPT processing leads to the formation of the UFG microstructure with ...

High-entropy alloys are known to possed good mechanical properties which usually related the preparation technique. In this work, CoCrFeNiMnXAl20-X (X=5, 10, 15) were prepared by a combination of alloying (MA) and com-pacted via spark plasma sintering (SPS). Such materials examined for their phase composition microstructure. Furthermore, as result content Mn/Al determined. It was found, that pa...

Abstract Al–Zn alloys having different Zn contents of 2, 5, 10 and 30 wt% were processed by high-pressure torsion (HPT) to produce ultrafine-grained (UFG) materials. Microstructural features these UFG investigated using depth-sensing indentations, focused ion beam (FIB), scanning electron microscopy (SEM) differential calorimetry (DSC). Emphasis was placed on the microstructure evolution with Z...

The evolution of strain hardening behavior the Fe50(CoCrMnNi)50 medium-entropy alloy as a function fraction recrystallized microstructure and grain size was studied using Hollomon Ludwigson equations. specimens under study were partially recrystallized, fully with ultrafine-grained microstructure, coarse grains. yield strength decreases steadily increases due to recovery process Hall–Petch effe...

An effect of tempforming on the microstructure, carbide precipitation, and strengthening mechanisms high-strength low-alloyed steel has been analyzed. The quenched was subjected to 1 h tempering at a temperature 873 K, 923 or 973 K followed by plate rolling same temperature. Tempforming resulted in formation an ultrafine grained lamellar-type microstructure with finely dispersed carbides (Nb,V)...