Abstract. Ti-6Al-7Nb alloy was quenched below and above the β-phase field processed by high-pressure torsion (HPT) to produce different grain sizes in ultra-fine range. The influence of temperature strain rate over superplastic properties, activation energy sensitivity were evaluated high tensile tests. mechanical properties complemented with Vickers microhardness measurement heat treated HPT-p...

The research on structural features, microhardness distribution, and deformation features of Vit105 bulk metallic glass (BMG) before after high-pressure torsion (HPT), as well relaxing annealing, has been carried out. HPT n = 1 leads to an increase in free volume ?V, annealing a decrease ?V non-uniformity relative the initial state BMG. In BMG is uniformly distributed over surface, while materi...

By analyzing the problem of high pressure torsion (HPT) in the rigid plastic formulation, we show that the power hardening law of plastically deformed materials leads to self-similarity of HPT, admitting a simple mathematical description of the process. The analysis shows that the main parameters of HPT are proportional to β q , with β being the angle of the anvil rotation. The meaning of the p...

One of the most common methods for production of ultra fine grained materials is severe plastic deformation (SPD). In this study, constrained groove pressing (CGP) and high pressure torsion (HPT) processes as effective methods of severe plastic deformation for the strain imposed on the pure copper were used. This paper presents the results of an experimental research, to review the influence of...

High-pressure torsion (HPT) imparts inhomogeneous strain to process discs with low in the center and higher at outer edge. Microscopy microhardness indentation have been used characterize correlate this inhomogeneity strain, but similar exploration other properties has uncommon. In work, electrical conductivity of pure copper processed by HPT was characterized respect equivalent cutting them in...

The authors previously used the accumulative high-pressure torsion (ACC HPT) method for first time on steel 316, β-Ti alloy, and bulk metallic glass vit105. On low-alloyed alloys, in particular, zirconium alloy Zr-1%Nb, new was not used. This has a tendency to α → ω phase transformations at using simple HPT. When ACC HPT, transformation can be influenced greater extent. article studies sliding ...

In this paper, the microstructural and hardness evolutions of an Mg-5.91Gd-3.29Y-0.54Zr (wt%) alloy during high-pressure torsion (HPT) were investigated. Deformation twinning played a crucial role in HPT-induced grain subdivision process. 1/8-revolution disk, 101¯1 101¯2 twins with different twin variants, 101¯1−101¯2 secondary twin-twin interactions activated. Primary prevailed at very central...

A novel hybrid material was fabricated from the Al–Ti system using high-pressure torsion up to 50 turns. Microstructural observations revealed intermetallic phases and mixing zones enriched in Ti, consisting of grains ~20 nm within an Al matrix. Microhardness measurements gave values higher than HPT-processed bulk aluminium alloy.

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...

The study of the fundamentals ? ? ? and ? phase transformations induced by high-pressure torsion (HPT) in Ti–Nb-based alloys is presented current work. Prior to HPT, three with 5, 10, 20 wt% Nb were annealed temperature range 700–540°C order obtain (? + ?)-phase state a different amount ?-phase. samples for long time reach equilibrium content ?-solid solution. Scanning electron microscope (SEM)...