Twist Channel Multi-Angular Pressing (TCMAP) as a method for increasing the efficiency of SPD

Kocich, Radim; Greger, Miroslav; Kursa, Miroslav; Szurman, Ivo; Macháčková, Adéla

doi:10.1088/1757-899x/63/1/012006

Cited by 44 publications

(24 citation statements)

References 21 publications

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“…They include an inlet channel with variable cross-section, additional twist and small angular steps [68,69]; transverse shear and expanding zone between channels [70,71]; an additional area reduction step in the outlet channel [72]. These and similar modifications significantly increase extrusion pressure, decrease a billet length and require extrusion "billet-bybillet" without channel lubrication and inspection.…”

Section: Modifications Of Ecaementioning

confidence: 99%

Review: Modes and Processes of Severe Plastic Deformation

Segal¹

2018

Preprint

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In this review, severe plastic deformation (SPD) is considered as a materials processing technology. The deformation mode is the principal characteristic differentiating SPD techniques from common forming operations. For large plastic strains, deformation mode depends on the distribution of strain rates between continuum slip lines and can be varied from pure shear to simple shear. A scalar, invariant and dimensionless coefficient of deformation mode is introduced as a normalized speed of rigid rotation. On this basis, simple shear provides the optimal mode for structure modification and grain refinement whereas pure shear is "ideal" for forming operations. Special experiments and SPD practice confirm this conclusion. Various techniques of SPD are classified and described in accordance with simple shear realization or approximation. It is shown that correct analyses of the processing mechanics and technological parameters are essential for comparison of SPD techniques and the development of effective industrial technologies.

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Section: Modifications Of Ecaementioning

confidence: 99%

Review: Modes and Processes of Severe Plastic Deformation

Segal¹

2018

Preprint

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“…On the other hand, the full contact of the extruded material with the channel, together with its complicated construction, increases the load on the punch, and consequently the power demands of the entire extrusion process. Measurements of microhardness values for the TCMAP-processed CP Al sample showed a substantial increase in the average HV value (increase by 97% compared with the original CP Al, to ~90 HV), as well as high microhardness homogeneity along the diagonals across the square TCMAP sample cross section [65].…”

Section: Twist Channel Multi Angular Pressingmentioning

confidence: 95%

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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“…Refinement of the structural units can be provided via plastic deformation [7] (advantageously via severe plastic deformation (SPD) methods [8] such as equal channel angular pressing [9,10], high pressure torsion [11], and accumulative roll bonding [12]), processing via methods of powder metallurgy (PM) [13], by combinations of PM and SPD [14], or via additions of structure refining elements. Since Mg-based alloys in industry are usually used for die-casting [15], the effects of the alloying elements are of the utmost importance.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Characterisation of a Newly Developed Mg–Dy–Al–Zn–Zr Alloy Structure

Kunčická

Kocich

2018

Metals

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This is a report on the structure phases and precipitates in a newly developed Mg-10Dy-3Al-1Zn-0.2Zr alloy. Specimens from the cast alloy were heat treated at temperatures of 480 • C, 520 • C and 560 • C, all for 8 and 16 h, and subsequently quenched. The structures were then analysed using scanning and transmission electron microscopy, while the mechanical properties were investigated using microhardness measurements. The results showed the different temperatures, as well as times, influence both the chemical composition and morphology of the precipitated phases. The occurrence of the β-phase changed with increasing temperature and time from grain boundary segregations through fine elongated particles to coarse plate-like precipitates. Polygon-shaped Dy-rich precipitates were observed in all the samples; however, their size decreased and their distribution homogenised with increasing annealing temperature and time. The samples annealed at 520 • C and 560 • C exhibited the presence of lamellar 18R-type long period stacking ordered (LPSO) phases. Microhardness measurements were in accordance with results of the microscopic analyses; although the values varied between 60 and 65 HV for all the material states, the most uniform distribution was observed for the 560 • C/8-h sample, which featured the finest precipitates and LPSO phases.

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Twist Channel Multi-Angular Pressing (TCMAP) as a method for increasing the efficiency of SPD

Cited by 44 publications

References 21 publications

Review: Modes and Processes of Severe Plastic Deformation

Review: Modes and Processes of Severe Plastic Deformation

Decade of Twist Channel Angular Pressing: A Review

Comprehensive Characterisation of a Newly Developed Mg–Dy–Al–Zn–Zr Alloy Structure

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