Effect of strain path on severely deformed aluminium

Kunčická, Lenka; Kocich, Radim; Král, Pétr; Pohludka, Martin; Marek, Martin

doi:10.1016/j.matlet.2016.05.163

Cited by 47 publications

(35 citation statements)

References 15 publications

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“…The grains also featured a high dislocations density and well developed substructure, as documented by Figure 8a [61]. The sample processed by two ECAP passes via route Bc also featured refined grains and a deformed substructure, but exhibited no highly developed subgrains [58].…”

Section: Structure and Propertiesmentioning

confidence: 99%

“…Nevertheless, the sample processed via a single TCAP pass exhibited the strength of approximately 340 MPa, which can be attributed to two main phenomena-the presence of strengthening secondary particles, and substantial grain refinement. The efficiency of multiple TCAP on grain refinement was thoroughly documented for CP Cu [49], whereas the effects of the strain paths acting during a single pass through the TCAP die were characterized via studies on samples of CP Al [58,59]. The analyses showed that the original unprocessed Al sample exhibited relatively coarse grains with bimodal grain size distribution (the average grain diameter was 39 µm) and more or less random grains orientations.…”

Section: Structure and Propertiesmentioning

confidence: 99%

“…The comparison of textures within CP Al after TCAP and ECAP was also performed [58,59]; however, comparing textures of materials processed by different SPD processes can be ambiguous, as texture is affected by various factors and, above all, the strain paths along which the shear strain is imposed (ideal texture components are characterized according to the description performed by Beyerlein and Tóth [63]). The original weak cubic texture present in the unprocessed Al transformed into A ideal texture component, and B texture fibre parallel to the shear direction (<110>||SD) after a Taking into consideration the high imposed energy and substructure development occurring during a single pass, the structure of TCAP-processed material can be considered to be metastable, and further structure changes can be supposed to occur over time.…”

Section: Texturementioning

confidence: 99%

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Decade of Twist Channel Angular Pressing: A Review

Macháčková

2020

Materials

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The methods of severe plastic deformation (SPD) have gained attention within the last decades primarily owing to their ability to substantially refine the grains within metallic materials and, therefore, significantly enhance the properties. Among one of the most efficient SPD methods is the equal channel angular pressing (ECAP)-based twist channel angular pressing (TCAP) method, combining channel twist and channel bending within a single die. This unique die affects the processed material with three independent strain paths during a single pass, which supports the development of substructure and efficiently refines the grains. This review is intended to summarize the characteristics of the TCAP method and its main features documented within the last decade, since its development in 2010. The article is supplemented with a brief characterization of other known SPD methods based on the combination of ECAP and twist extrusion (TE) within a single die.

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Section: Structure and Propertiesmentioning

confidence: 99%

Section: Structure and Propertiesmentioning

confidence: 99%

Section: Texturementioning

confidence: 99%

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Decade of Twist Channel Angular Pressing: A Review

Macháčková

2020

Materials

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“…The positive effect of combining various SPD methods, passes and components together has already been proven [39,40]. However, TCAP provides a new combination of strain paths in a single pass, which is very efficient from the viewpoint of grain refinement [35]. …”

Section: A Grain Sizementioning

confidence: 99%

“…The method has a favourable influence on strain homogenization across the sample crosssection, too [32,33]. Previously published studies thoroughly investigated the influence of die geometry on the overall imposed strain [34], and compared grains orientations, misorientations and textures in materials processed by TCAP and various numbers of ECAP passes [35,36].…”

Section: Introductionmentioning

confidence: 99%

Natural ageing of aluminium processed by twist channel angular pressing

Kunčická¹,

Kocich²

2017

Fifth International Conference on Advances in Civil, Structural and Mechanical Engineering - CSM 2017

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-The method of twist channel angular pressing (TCAP) was invented with the aim to increase the efficiency of single pass severe plastic deformation (SPD) technologies. The study shows the structure of TCAP-processed aluminium after processing and the changes developed in the structure after a year of natural ageing at room temperature. The grain refinement after a single pass TCAP was very significant due to effectively imposed shear strain; the majority of grains were smaller than 5μm. The grains further showed sub-structure featuring fine precipitates, accumulated dislocations and developed subgrains. Transmission electron microscopy of the one-year-aged samples showed increased precipitation; the precipitates acted as effective obstacles for grain growth and structure recovery. The microscopy results were supplemented with microhardness measurements, the results of which showed a significant hardening for the single pass TCAP, after which the average microhardness increased from 44.6 HV to more than 91 HV.

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Effects of Temperature (In)homogeneity during Hot Stamping on Deformation Behavior, Structure, and Properties of Brass Valves

Kunčická

Kocich

2021

Adv Eng Mater

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Herein, assessing the effects of initial temperature (in)homogeneity on a hot‐stamped CuZn40Pb2 medical gas valve (fitting) via numerically and experimentally defining mutual relations of selected deformation parameters and optimizing temperature distribution within the original semi‐product heated via induction are focused. For these purposes, three preheating regimes are simulated, and deformation behaviors are evaluated. The predicted results are validated by experimental stamping and subsequent evaluation of the structure and properties of stamped fittings. The results show that preheating the semi‐product with a certain temperature gradient occurring between the axial and (sub)surface regions is favorable, as homogeneous initial temperature distribution results in rapid surface cooling by the effect of heat transfer from semi‐product to die, which imparts inhomogeneous stress distribution, local changes in structural phases, and possible occurrence of oxides. Too low (sub)surface temperature of the semi‐product can result in a significant (local) increase in flow stress, which consequently results in the danger of occurrence of forming defects. The brass fitting stamped with the optimized preheating procedure features an average grain size of 5.8 μm, uniform grains’ orientations with maximum texture intensity of two times random, and ultimate tensile strength of almost 400 MPa, while maintaining elongation to failure of more than 35%.

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Effect of strain path on severely deformed aluminium

Cited by 47 publications

References 15 publications

Decade of Twist Channel Angular Pressing: A Review

Decade of Twist Channel Angular Pressing: A Review

Natural ageing of aluminium processed by twist channel angular pressing

Effects of Temperature (In)homogeneity during Hot Stamping on Deformation Behavior, Structure, and Properties of Brass Valves

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