Microstructure Evolution in Pure Al Processed with Twist Extrusion

Orlov, Dmitry; Beygelzimer, Yan; Synkov, Sergey; Varyukhin, V. N.; Tsuji, Nobuhiro; Horita, Zenji

doi:10.2320/matertrans.md200802

Cited by 59 publications

(48 citation statements)

References 23 publications

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“…This is an evidence of larger strain at the periphery of the billet than at the axial part, as comprehensively discussed in Refs. 15,18). Early stages of lamellar structure formation can be seen: grains at the peripheral areas are mostly elongated although rather equiaxed and coarse grains remain in the billet center.…”

Section: Comparative Analysis Of Plastic Flow and Grain Refinement Inmentioning

confidence: 84%

Comparative Analysis of Plastic Flow and Grain Refinement in Pure Aluminium Subjected to Simple Shear-Based Severe Plastic Deformation Processing

et al. 2012

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In the present work, effects of loading scheme and strain reversal on structure and hardness evolution have been studied by using high pressure torsion (HPT) and twist extrusion (TE) techniques. High purity aluminium (99.99%) was processed at room temperature up to a maximum total equivalent strain of ¾ max μ 8 by TE, and HPT in monotonic and reversal deformation modes with strain increment ¦¾ max = 1. Minimum subgrain sizes reached in this study were 1.6 µm for TE and 1.1 µm for HPT. It was revealed that microstructural change with straining was a common consequence of severe plastic deformation (SPD) processing and was not affected significantly by the loading scheme. Among the SPD methods used in this study, HPT in monotonic regime produced the smallest grain size, while the most homogeneous microstructure was obtained by TE due to specific vortex-like flow field imposed by the tool geometry.

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Section: Comparative Analysis Of Plastic Flow and Grain Refinement Inmentioning

confidence: 84%

Comparative Analysis of Plastic Flow and Grain Refinement in Pure Aluminium Subjected to Simple Shear-Based Severe Plastic Deformation Processing

et al. 2012

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“…Based on the performed investigations should be noted that in heavy processed CuCr0.6 alloy, the distribution of strain is heterogeneous which is typical for most SPD processes [9,10]. It is evident that applied value of total effective strain ε f t = 1.7 in RCMR process is insufficient in generating UFG structure in the whole volume of sample.…”

Section: Resultsmentioning

confidence: 99%

Effect of Rolling with Cyclic Movement of Rolls Method on Structure and Hardness of CuCr0.6 Alloy

2016

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A novel severe plastic deformation method entitled rolling with cyclic movement of rolls was proposed to fabricate ultrafine grained CuCr0.6 copper alloy. The alloy in the solution treated conditions was processed by rolling with cyclic movement of rolls method by using process parameters as amplitude of rolls movement (A = 0.9 mm), frequency of rolls movement (f = 1 Hz), rolling reduction (ε h =50%) and rolling rate (v = 1, v = 2, v = 3 rpm). Light microscopy, scanning electron microscopy and a electron backscattering diffraction detector, and scanning transmission electron microscopy were used for microstructural characterization, and hardness tests for a preliminary assessment of mechanical properties. Quantitative studies of the average diameter of the subgrains d (µm) and the average diameter of the grains D (µm) were performed using the scanning electron microscopy/electron backscattering diffraction method. Misorientation angles were analyzed by the Kikuchi-line technique using TSL-OIM software. The results show that the samples underwent very high strain at the lateral areas and smaller at the central areas. As a result, the microstructure became heterogeneous and remained unchanged with change in compression rate. The transverse movement of rolls causes in the material significant effect of refining structure in peripheral areas of sample.

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“…Worth noting is the fact that processes of severe plastic deformation may be applied using combination of the various methods. Few of the most relevant are high pressure torsion HPT [11,12], twist extrusion TE [13,14], accumulative rollbonding ARB [15,16], cyclic extrusion compression CEC [17]. Relatively new and promising one is a KoBo method.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Microstructure and Mechanical Properties Changes in AA1050 Aluminum Subjected to ECAP and KoBo Processes / Analiza Zmian Mikrostruktury I Własności Mechanicznych Aluminium AA1050 Po Procesie ECAP I KoBo

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et al. 2015

Archives of Metallurgy and Materials

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AnAlysIs of mIcrostructurE And mEchAnIcAl propErtIEs chAngEs In AA1050 AlumInum subjEctEd to EcAp And Kobo procEssEsAnAlizA zmiAn mikrostruktury i włAsności mechAnicznych Aluminium AA1050 po procesie ecAp I KoboAnalysis of the results of the microstructure and the mechanical properties change in AA1050 aluminum alloy of technical purity processed using ECAP (Equal Channel Angular Pressing) and KoBo deformation methods are presented in the paper.. ECAP process was performed according to Bc scheme in the range from 1 up to 10 passes. Changes of microstructure were analyzed using scanning electrone microscope equipped with electron backscattered diffraction (EBSD) system. Microstructure and fraction of high-angle grain boundaries in KoBo processed samples were similar to those observed in ECAP processed samples after four passes. The most significant microstructure refinement was observed in ECAP processed sample submitted to 10 passes. In ECAP method the systematic increase of mechanical properties was observed along with increase of deformation degree.

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Microstructure Evolution in Pure Al Processed with Twist Extrusion

Cited by 59 publications

References 23 publications

Comparative Analysis of Plastic Flow and Grain Refinement in Pure Aluminium Subjected to Simple Shear-Based Severe Plastic Deformation Processing

Comparative Analysis of Plastic Flow and Grain Refinement in Pure Aluminium Subjected to Simple Shear-Based Severe Plastic Deformation Processing

Effect of Rolling with Cyclic Movement of Rolls Method on Structure and Hardness of CuCr0.6 Alloy

Analysis of Microstructure and Mechanical Properties Changes in AA1050 Aluminum Subjected to ECAP and KoBo Processes / Analiza Zmian Mikrostruktury I Własności Mechanicznych Aluminium AA1050 Po Procesie ECAP I KoBo

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