It is shown that thermomechanical treatment (TMT) of the EK61 superalloy with a strain rate (ε∙) 10−3 s−1 and gradual decrease in temperature from (0.92 – 0.65)Tδ leads to transformation initial coarse-grained structure into an ultrafine-grained (UFG) mixed type structure. Such UFG microstructure consists γ-phase grains δ-phase particles 0.3 μm size relatively large up 2 size. The having such e...

In the last three decades, several severe plastic deformation (SPD) procedures have been developed and applied in materials science to create bulk, ultrafine-grained (UFG) structures. As a consequence of SPD, not only submicron even nanometer grain sizes can be obtained, but also new boundaries with non-equilibrium structures material may formed. Therefore, both strength ductility UFG change si...

In this paper, the fracture kinetics and mechanisms in low-cycle fatigue region were analyzed for different ultrafine-grained (UFG) materials with body-centered cubic (bcc), hexagonal close-packed (hcp) face-centered (fcc) lattices. Three-point bending principle tests performed. The show that UFG structure formation investigated has an ambiguous effect on total number of cycles to failure (life...

Aluminum alloys with nanocrystalline (NC) and ultrafine grain (UFG) size are of interest because of their strengths that are typically 30 pct greater than conventionally processed alloys of the same composition. In this study, UFG AA 5083 plate was prepared by quasi-isostatic (QI) forging of cryomilled powder, and the microstructure and mechanical behavior was investigated and compared with the...

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...

This paper presents the results of studies on true fracture stresses Al alloy 6101 with an ultrafine-grained (UFG) structure processed by equal channel angular pressing — conform (ECAP-C) method and same after artificial aging (AA state). The grain size in UFG state was about 500 nm. Aging particles Al3Fe were present AA state. Strength yield stress increase as a result formation structure. str...

A 0.4C-2Si-1Cr-1Mo steel with an ultrafine elongated grain (UFEG) structure and an ultrafine equiaxed grain (UFG) structure was fabricated by multipass caliber rolling at 773 K and subsequent annealing at 973 K. A static three-point bending test was conducted at ambient temperature and at 77 K. The strength-toughness balance of the developed steels was markedly better than that of conventionall...

For this paper, studies of the microstructure as well mechanical and biological properties bioinert titanium, zirconium, niobium alloys in their nanostructured (NS) ultrafine-grained (UFG) states have been completed. The NS UFG were formed by a combined two-step method severe plastic deformation (SPD), first with multidirectional forging (MDF) or pressing into symmetrical channel (PSC) at given...

This paper presents the results of a comprehensive study erosive wear resistance, strength, and adhesive characteristics high-temperature structural titanium alloy Ti-5.7Al-3.8Mo-1.2Zr-1.3Sn (the Russian grade VT8M-1) with coarse-grained ultrafine-grained (UFG) structures protective erosion-resistant TiVN coating produced by physical vapor deposition (PVD), deposited on surface. A microscopic a...

The unique concept of phase reversion involving severe deformation parent austenite into martensite, followed by annealing for a short duration, whereby the strain-induced martensite reverts to austenite, was adopted obtain nano-grained/ultrafine-grained (NG/UFG) structure in Cu-bearing biomedical austenitic stainless steel resulting high strength-high ductility combination. Work hardening and ...