Inhomogeneity in microstructure and mechanical properties during twist extrusion

Noor, Sh. Vakili; Eivani, A.R.; Jafarian, H.R.; Mirzaei, Moein

doi:10.1016/j.msea.2015.11.056

Cited by 23 publications

(5 citation statements)

References 14 publications

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“…Notably, the highest strain accumulates at the corners, while the lowest strain is observed at the center. This distribution pattern is linked to the inhomogeneous strain distribution characteristic of the LTE process [41,50]. Figures 13 and 14 highlight that in NLTE processes the evolution of equivalent plastic strain is notably uniform.…”

Section: Resultsmentioning

confidence: 92%

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Comparison of Linear and Nonlinear Twist Extrusion Processes with Crystal Plasticity Finite Element Analysis

Şimşek,

Davut,

Miyamoto

et al. 2024

Materials

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The mechanical characteristics of polycrystalline metallic materials are influenced significantly by various microstructural parameters, one of which is the grain size. Specifically, the strength and the toughness of polycrystalline metals exhibit enhancement as the grain size is reduced. Applying severe plastic deformations (SPDs) has a noticeable result in obtaining metallic materials with ultrafine-grained (UFG) microstructure. SPD, executed through conventional shaping methods like extrusion, plays a pivotal role in the evolution of the texture, which is closely related to the plastic behavior and ductility. A number of SPD processes have been developed to generate ultrafine-grained materials, each having a different shear deformation mechanism. Among these methods, linear twist extrusion (LTE) presents a non-uniform and non-monotonic form of severe plastic deformation, leading to significant shifts in the microstructure. Prior research demonstrates the capability of the LTE process to yield consistent, weak textures in pre-textured copper. However, limitations in production efficiency and the uneven distribution of grain refinement have curbed the widespread use of LTE in industrial settings. This has facilitated the development of an improved novel method, that surpasses the traditional approach, known as the nonlinear twist extrusion procedure (NLTE). The NLTE method innovatively adjusts the channel design of the mold within the twist section to mitigate strain reversal and the rotational movement of the workpiece, both of which have been identified as shortcomings of twist extrusion. Accurate anticipation of texture changes in SPD processes is essential for mold design and process parameter optimization. The performance of the proposed extrusion technique should still be studied. In this context, here, a single crystal (SC) of copper in billet form, passing through both LTE and NLTE, is analyzed, employing a rate-dependent crystal plasticity finite element (CPFE) framework. CPFE simulations were performed for both LTE and NLTE of SC copper specimens having <100> or <111> directions parallel to the extrusion direction initially. The texture evolution as well as the cross-sectional distribution of the stress and strain is studied in detail, and the performance of both processes is compared.

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Section: Resultsmentioning

confidence: 92%

“…Achieving a homogeneous grain distribution requires multiple passes [38,39]. Furthermore, during TE, rigid body rota-tion of the workpiece results in high local strain and punch forces [40][41][42]. In TE, a notable phenomenon is the significant grain refinement that occurs during the initial passes [43].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Linear and Nonlinear Twist Extrusion Processes with Crystal Plasticity Finite Element Analysis

Şimşek,

Davut,

Miyamoto

et al. 2024

Materials

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“…Although numerous SPD processes have been introduced, not all the existing methods can be listed here owing to the continuing research in this field. However, the examples are high pressure sliding [14], high pressure tube twisting [15], friction stir processing [16], equal channel angular drawing [17], ECAP-partial back pressure [18], accumulative back extrusion [19], accumulative roll bonding [20], accumulative spin bonding [21], constrained groove pressing [22], constrained studded pressing [23], parallel tubular channel angular pressing [24], tube channel pressing [25], elliptical cross-section spiral equal-channel extrusion [26], C-shape equal channel reciprocating extrusion [27], half channel angular extrusion [28], cyclic extrusion compression [29], cyclic closed die forging [30], cyclic expansion extrusion [31], cyclic extrusion compression angular pressing [32], (variable lead) axi-symmetric forward spiral extrusion [33,34], forward shear normal extrusion [35], rotary extrusion [36], torsion extrusion (TE) [37], twist extrusion (TE) [38], simple shear extrusion [39], continuous shearing [40], continuous confined strip shearing [41], continuous frictional angular extrusion [42], repetitive corrugation straightening [43], severe torsion straining [44], and so on.…”

Section: Severe Plastic Deformation Processesmentioning

confidence: 99%

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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“…This refers particularly to aluminum and Al alloys, [41][42][43]49,52,72,118,119] copper and Cu alloys, [25,34,36,39,45,63,65,68,[120][121][122][123] titanium and its alloys, [64,65,70,[124][125][126][127][128][129] as well as various steels. This refers particularly to aluminum and Al alloys, [41][42][43]49,52,72,118,119] copper and Cu alloys, [25,34,36,39,45,63,65,68,[120][121][122][123] titanium and its alloys, [...…”

Section: Ultrafine Grained Structurementioning

confidence: 99%

Twist Extrusion as a Potent Tool for Obtaining Advanced Engineering Materials: A Review

et al. 2017

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Twist extrusion (TE) is one of the most popular techniques of severe plastic deformation, aiming at imparting to a material a tailored microstructure and the associated property improvement. The article provides a survey of the literature on the mechanics of TE and the effect it has on the structure, texture, and the attendant properties of various materials, including metals and alloys, powder materials, and polymers. Special emphasis is placed on vortex flow during TE and its hitherto unexplored potential for producing micro-and macrostructures that promise superior properties of the materials. In particular, the possibility of creating novel hybrid materials with chiral inner architecture is demonstrated. The survey is concluded by a presentation of examples of practical applications of TE.

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Inhomogeneity in microstructure and mechanical properties during twist extrusion

Cited by 23 publications

References 14 publications

Comparison of Linear and Nonlinear Twist Extrusion Processes with Crystal Plasticity Finite Element Analysis

Comparison of Linear and Nonlinear Twist Extrusion Processes with Crystal Plasticity Finite Element Analysis

Decade of Twist Channel Angular Pressing: A Review

Twist Extrusion as a Potent Tool for Obtaining Advanced Engineering Materials: A Review

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