Study of structure of naturally aged aluminium after twist channel angular pressing

Kunčická, Lenka; Kocich, Radim; Ryukhtin, Vasyl; Cullen, Jonathan C.T.; Lavery, Nicholas

doi:10.1016/j.matchar.2019.03.045

Cited by 34 publications

(22 citation statements)

References 27 publications

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“…Several research works showed that imposing intensive shear strain into THAs during their production enhances their utility properties and ballistic performance [7,8]. Probably the most widespread SPD method is the equal channel angular pressing (ECAP) and its modifications (TCAP [9], TCMAP [10], NECAP [11], etc. ), which have been proven to refine effectively the grain size to the ultra-fine-grained (UFG) scale for various materials ranging from aluminium [12], through magnesium [13], copper [14], steel [15], and also tungsten [16,17].…”

Section: Introductionmentioning

confidence: 99%

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

et al. 2020

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Knowledge of texture and residual stresses in tungsten heavy pseudoalloys is substantial for the microstructure optimization. These characteristics were determined in cold and warm rotary swaged W/NiCo composite with help of neutron diffraction. The results were discussed in view of the observed microstructure and mechanical properties. The investigated bars consisted of tungsten agglomerates (bcc lattice) surrounded by NiCo-based matrix (fcc lattice). No preferential crystallographic orientation was found in the as-sintered bar. A strong texture was formed in both the tungsten agglomerates (<101> fiber texture parallel to the swaging axis) and in the NiCo-based matrix (<111> fiber texture) after rotary swaging. Although usually of double-fiber texture, the <001> fiber of the fcc structures was nearly missing in the matrix. Further, the cold-swaged bar exhibited substantially stronger texture for both phases which corresponds to the higher measured ultimate tensile strength. The residual stress differences were employed for characterization of the stress state of the bars. The largest residual stress difference (≈400 MPa) was found at the center of the bar deformed at room temperature. The hoop stresses were non-symmetrical with respect to the swaging axis, which was likely caused by the elliptical cross section of the as-sintered bar.

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Section: Introductionmentioning

confidence: 99%

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

et al. 2020

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“…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. This presupposition was confirmed in a study dealing with two-year-old CP Al samples [62]. After natural ageing, the restoration processes provoked the grains to further refine down to the average grain size of~1 µm.…”

Section: Texturementioning

confidence: 60%

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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“…The twist channel angular pressing (TCAP) method combines twist and bend deformation zones within a single equal channel, which enables to impart a substantial shear strain during a single pass [48,49]. TCAP has been successfully proven to impart homogeneous UFG structures, and the effectivity of single pass TCAP has been documented to be higher than double pass ECAP [22,50,51].…”

Section: Introductionmentioning

confidence: 99%

“…Intensive shear deformation imparted by the combination of high pressure and rotary movement processed at room/elevated temperatures also supports mutual bonding of the used materials [ 14 , 15 , 16 , 17 ]. The SPD technologies mostly used to prepare composite materials are the equal channel angular pressing (ECAP) [ 18 , 19 , 20 ] and ECAP-based methods [ 21 , 22 ], high pressure torsion (HPT) [ 23 ], and accumulative roll bonding (ARB) [ 24 ]. ECAP and HPT are advantageous for the consolidation of powders, as well as for their subsequent processing to the final shapes, whereas ARB is especially favorable for enhancing structure refinement of preconsolidated materials [ 25 ], or for the preparation of clad composites [ 26 ]; the latter has been successfully performed also via the repeated folding (RF) process, the fundamentals of which are similar to ARB [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Structure Characteristics Affected by Material Plastic Flow in Twist Channel Angular Pressed Al/Cu Clad Composites

Kunčická

Klečková

2020

Materials

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The study focuses on structure analyses, texture analyses in particular, of an Al/Cu clad composite manufactured by single and double pass of the twist channel angular pressing (TCAP) method. Microscopic analyses were supplemented with numerical predictions focused on the effective imposed strain and material plastic flow, and microhardness measurements. Both the TCAP passes imparted characteristic texture orientations to the reinforcing Cu wires, however, the individual preferential grains’ orientations throughout the composite differed and depended on the location of the particular wire within the Al sheath during extrusion, i.e., on the dominant acting strain path. The second TCAP pass resulted in texture homogenization; all the Cu wires finally exhibited dominant A fiber shear texture. This finding was in accordance with the homogenization of the imposed strain predicted after the second TCAP pass. The results also revealed that both the component metals exhibited significant deformation strengthening (which also caused bending of the ends of the Cu wires within the Al sheath after extrusion). The average microhardness of the Cu wires after the second pass reached up to 128 HV, while for the Al sheath the value was 86 HV.

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Study of structure of naturally aged aluminium after twist channel angular pressing

Cited by 34 publications

References 27 publications

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

Texture and Differential Stress Development in W/Ni-Co Composite after Rotary Swaging

Decade of Twist Channel Angular Pressing: A Review

Structure Characteristics Affected by Material Plastic Flow in Twist Channel Angular Pressed Al/Cu Clad Composites

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