Studies on the Superplasticity Effect in UFA: History and Development (In Memory of Prof. O.A. Kaibyshev)

Valiev, Ruslan Z.; Салищев, Г. А.; Utyashev, F. Z.; Langdon, Terence G.

doi:10.1515/rams-2018-0017

Cited by 4 publications

(3 citation statements)

References 56 publications

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“…In order to use these techniques for the production of nanostructured samples, it was vitally necessary to confirm the formation of ultrafine-grained microstructure, distinct from the cold-worked one. The orientation imaging characterization techniques were in rudimentary stage at that time (end of 80s of the last century), and an unambiguous confirmation that microstructure of materials processed by ECAP and HPT indeed contains predominantly high angle grain boundaries, delivered the experiments of Valiev et al 9) In this work the authors demonstrated that HPT-processed Al4%Cu0.5%Zr alloy showed superplastic behavior at relatively low for this alloy temperature of 220°C, which could be realized only thanks to the activation of grain boundary sliding and acceleration of grain boundary diffusion. During 10 years after this publication, the scientific research field "Nanomaterials by severe plastic deformation" has been established, which was documented in a fundamental review paper by Valiev et al 16) that has been cited 6200 times by now.…”

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confidence: 94%

Perspectives of Scaling up of Severe Plastic Deformation: A Case of High Pressure Torsion Extrusion

Ivanisenko¹

2023

Mater. Trans.

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A demand for cheap and simple methods of processing of nanocrystalline materials attracted attention to metal forming techniques allowing introduction of large strains into metallic materials. Thanks to that a new scientific field, "Materials by severe plastic deformation", had been born and became an important segment of material science. High pressure torsion (HPT) is the most effective SPD method in respect of the microstructure refinement and processing costs. Despite attractive mechanical and physical properties demonstrated by HPT-processed materials, this technique cannot be used in industry due to a limited size of processed samples. To overcome this problem, a plenty of SPD methods, allowing processing of large-scale billets, was developed. However, none of them has found any application in industry, except a few cases, which are rather exceptions that confirm the rule. This overview is an attempt to analyze the reasons why industrial players remain reluctant to use SPD in technological processes. For this purpose, the advantages and drawbacks of the High Pressure Torsion Extrusion method of SPD are regarded.

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confidence: 94%

Perspectives of Scaling up of Severe Plastic Deformation: A Case of High Pressure Torsion Extrusion

Ivanisenko¹

2023

Mater. Trans.

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“…It is known that the ultra-fine-grained structure in the material has increased physical and mechanical properties, which, in turn, favorably affects the quality of surface layer [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Study of Surface Layer Hardening after Treatment Complex Tool

Mitrofanova

2020

SSP

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The results of experimental studies of the thin surface layer of samples made of steel 45 after treatment with surface plastic deformation (SPD) multiradius roller (MR-roller) are presented. On the basis of the apparatus of the mechanics of technological inheritance, taking into account the effect of the solidified body, a model of the process according to the scheme of multiple loading-unloading of metal, taking into account the phenomenology of the SPD process and the properties of the material, is created. Distributions of parameters of the stress-strain state in the deformation centre are obtained, the parameters of roughness and microhardness of the surface layer are investigated.

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“…Grain fragmentation and continuous dynamic/post-dynamic recrystallization [7,8] occur at SPD and provide an ultra-fine grain structure consisting of grains with high angle grain boundary misorientation [1,2,4,[6][7][8][9]. As a result, ultra-fine grain aluminum alloys exhibit increased mechanical properties at room temperature [1,4,7,10] and superplasticity at elevated temperatures [11][12][13][14][15]. The main disadvantage of the SPD technique is an increase in the cost of semi-finished products, which can be critical for many applications of aluminum-based alloys.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

Mikhaylovskaya

Котов

Kishchik

et al. 2019

Metals

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The current study observed a grain structure evolution in the central part and periphery of the sample of an Al–Mg–Mn-based alloy during isothermal multidirectional forging (IMF) at 350 °C with a cumulative strain of 2.1–6.3 and a strain per pass of 0.7. A bimodal grain size distribution with areas of fine and coarse grains was observed after IMF and subsequent annealing. The grain structure, mechanical properties, and superplastic behavior of the samples subjected to IMF with a cumulative strain of 6.3 and the samples exposed to IMF with subsequent cold rolling were compared to the samples exposed to a simple thermo-mechanical treatment. The micro-shear bands were formed inside original grains after the first three passes. The fraction of recrystallized grains increased and the mean size decreased with an increasing cumulative strain from 2.1 to 6.3. Significant improvements of mechanical properties and superplasticity were observed due to the formation of a homogenous fine grain structure 4.8 µm in size after treatment including IMF and subsequent cold rolling.

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Studies on the Superplasticity Effect in UFA: History and Development (In Memory of Prof. O.A. Kaibyshev)

Cited by 4 publications

References 56 publications

Perspectives of Scaling up of Severe Plastic Deformation: A Case of High Pressure Torsion Extrusion

Perspectives of Scaling up of Severe Plastic Deformation: A Case of High Pressure Torsion Extrusion

Study of Surface Layer Hardening after Treatment Complex Tool

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

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