Microstructure Evolution and Mechanical Properties of cp-Ti Processed by a Novel Technique of Rotational Constrained Bending

Krajňák, Tomáš; Janeček, Miloš; Minárik, Peter; Veselý, Jozef; Cejpek, Petr; Gubicza, Jenő; Hung, Pham Tran; Preisler, Dalibor; Nový, František; Рааб, А. Г.; Рааб, Г. И.; Asfandiyarov, R. N.

doi:10.1007/s11661-021-06157-0

Cited by 7 publications

(4 citation statements)

References 37 publications

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“…It should be noted that the grain size achieved by RCB processing is also influenced by the initial grain size of the material. Indeed, the much smaller initial grain size of 12 µm in commercially pure grade-4 Ti resulted in a much smaller grain size of 400 nm after 10 passes of RCB, as compared to the Cu-0.5 wt% Zr alloy, where the initial grain size was 180 µm, while the minimum grain size achieved 3.4 µm [13].…”

Section: Discussionmentioning

confidence: 99%

“…Such geometry enables us to use a hydraulic pressing machine which is able to exert very high pressures and thus is suitable for processing of hard materials. Recently, this new technique-called as rotational constrained bending (RCB)-was successfully used for exceptional microstructure refinement, down to the grain size of 400 nm in commercial pure (cp) grade 4 titanium with a closely packed hexagonal crystal structure [13]. Due to the limited experimental results obtained on the materials processed by RCB technique, further investigation on other types of materials which would introduce a deeper insight into the processing by RCB is highly desirable.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution in Cu–0.5 wt% Zr Alloy Processed by a Novel Severe Plastic Deformation Technique of Rotational Constrained Bending

Krajňák

Janeček

Minárik

et al. 2020

Metals

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In the present study, a coarse-grained Cu–0.5 wt% Zr alloy was repeatedly processed by a novel technique of rotational constrained bending (RCB). In this technique, the workpiece was deformed by bending in a channel with an angle of 90°, using a rotating roller. The influence of the number of passes (N) of RCB on strain distribution, microstructure evolution and mechanical properties of the alloy was investigated. The heterogeneous distribution of the microhardness in the billet cross-section after the first pass was transformed into a homogeneous one after twelve passes, due to the rotation of the sample by 90° clockwise between individual passes. In addition, the gradual refinement/homogenization of the microstructure and formation of strong (110) crystallographic texture were found with increasing N. The initial grain size of 180 μm decreased down to 3.4 μm after twelve passes. The dislocation density increased by two orders of magnitude after RCB processing. In accordance with the grain-size refinement and the strong increase of the dislocation density, RCB processing significantly enhanced the strength of the alloy, while the ductility considerably decreased. The yield stress increased from 63 to 524 MPa, while the elongation to failure decreased below 10% after twelve passes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution in Cu–0.5 wt% Zr Alloy Processed by a Novel Severe Plastic Deformation Technique of Rotational Constrained Bending

Krajňák

Janeček

Minárik

et al. 2020

Metals

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“…They investigated the plastic deformation distribution and microstructure of commercially pure titanium (grade 4). Results showed that the grain size decreased to 400 nm, and the tensile strength increased after four passes by about 15% [6]. Another novel technique has been introduced by Gorji et al as an SPD method that combines the Extrusion and ECAP processes (C-Ex-ECAP).…”

Section: Introductionmentioning

confidence: 99%

An investigation on the effective parameters and optimal design in ECAP-Conform process of commercially pure titanium using statistical and numerical approaches

2022

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The Equal Channel Angular Pressing-Conform (ECAP-Conform) process has improved the mechanical and functional properties of materials as well as resolves the disadvantages of conventional ECAP. The main goal of this study was investigation of the variable in ECAP-Conform process of pure titanium Grade 2. The design of experiments with full factorial technique was implemented in conjunction with finite element numerical simulation.The equivalent plastic strain, required torque, applied force on the ECAP die, and the warping radius of the product were measured and results were interpreted using analysis of variance. It was found that the ECAP die angles and the rod bending angle have the highest effect on both imposed strain and required torque. Also, the rod bending angle and the rod-die friction had no significant effect on the warping radius. The optimal values were specified for minimizing the required torque, reaction force, and warping radius, and maximizing the imposed strain. Based on the optimal estimated parameters, the minimum values of torque, force, warping radius, and maximum value of equivalent strain were predicted to 8.4 kN.m, 42 kN, 0.36 m, and 1.7, respectively. Also, the response optimizer obtained the results with less than 8% error in comparison with numerical simulation.

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“…ECAP equal-channel angular pressing, ECAR equal-channel angular rolling, ED electrodeposition, RCB rotational constrained bending, and MF multidirectional forging. The processing conditions of the listed materials can be found in Refs [27,[33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. …”

mentioning

confidence: 99%

Reliability and interpretation of the microstructural parameters determined by X-ray line profile analysis for nanostructured materials

Gubicza

2022

Eur. Phys. J. Spec. Top.

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In this overview, the applicability of X-ray diffraction line profile analysis (XLPA) for the characterization of the microstructure in nanostructured materials is overviewed. The dislocation densities obtained by whole pattern fitting and from the breadth of the diffraction peaks are compared. Both theoretical considerations and experimental evidences prove that the evaluation of the peak breadth solely is not suitable for the determination of the dislocation density. In addition, the microstructural parameters determined by XLPA were compared to the values obtained directly by microscopic methods. It was found that the ratio of the grain size obtained by microscopy and the crystallite size determined by XLPA decreases with the reduction of the grain size in nanomaterials, and below $$\sim $$ ∼ 20 nm, the two values agree within the experimental error. In addition, correlation between the microstructural parameters (e.g., crystallite size and dislocation density) determined by XLPA was not found. It was revealed that bottom–up processing methods can produce similarly high defect density in nanostructured materials as severe plastic deformation (SPD). The influence of stacking fault energy, melting point, and degree of alloying on the microstructure of nanomaterials is discussed in detail.

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Microstructure Evolution and Mechanical Properties of cp-Ti Processed by a Novel Technique of Rotational Constrained Bending

Cited by 7 publications

References 37 publications

Microstructure Evolution in Cu–0.5 wt% Zr Alloy Processed by a Novel Severe Plastic Deformation Technique of Rotational Constrained Bending

Microstructure Evolution in Cu–0.5 wt% Zr Alloy Processed by a Novel Severe Plastic Deformation Technique of Rotational Constrained Bending

An investigation on the effective parameters and optimal design in ECAP-Conform process of commercially pure titanium using statistical and numerical approaches

Reliability and interpretation of the microstructural parameters determined by X-ray line profile analysis for nanostructured materials

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