Deformation behavior of consecutive workpieces in equal channel angular pressing of solid dies

Joo, Soo Hyun; Yoon, Seung Chae; Jeong, Hye Gwang; Lee, Sunghak; Kim, Hyoung Seop

doi:10.1007/s10853-012-6472-5

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…It is also noted that the samples processed by ECAP-Conform have a more homogeneous distribution of hardness along their longitudinal direction than the samples by ECAP. This may be partially related to the aspect ratio of the samples which has a significant influence on the deformation zone at the die corner [10]. Figures 3 shows color-coded hardness maps for Al-6061 samples processed by conventional ECAP in the cross-sectional plane where the number of passes is indicated above each display and the meanings of the colors are given on the right.…”

Section: Resultsmentioning

confidence: 99%

“…However, previous FEM (finite element modeling) analysis of ECAP showed that the sample processed by ECAP cannot obtain homogeneity all along the length direction [8,9] and this may limit the application of ECAP-Conform. It was also found that this homogeneity can be reduced by processing consecutive workpieces through the ECAP die [10]. Thus, it is interesting to investigate the effect of continuous processing of ECAP on the homogeneity of the samples for comparison with conventional ECAP.…”

Section: Introductionmentioning

confidence: 99%

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Development of Homogeneity in an Al-6061 Alloy Processed by ECAP and ECAP-Conform

Langdon

2014

MSF

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Equal-channel angular pressing (ECAP) has been established as an effective method to achieve ultrafine-grained materials and ECAP combined with the Conform process (ECAP-Conform) is considered a promising candidate to realize continuous processing by ECAP. This paper describes experiments conducted on samples of an Al-6061 alloy in order to evaluate the homogeneity development of the alloy processed by ECAP and ECAP-Conform. The samples of the Al-6061 alloy were processed by ECAP and ECAP-Conform at room temperature up to 4 passes via route BC. The microhardness measurements were recorded both in the cross-sectional planes and along the longitudinal directions of the samples. The results show the alloy obtained significant strengthening using both processes. There was reasonable plastic isotropy after 4 passes of ECAP-Conform in both the cross-sectional plane and the longitudinal direction and the alloy showed a homogeneous microhardness distribution in the cross-sectional plane after 4 passes of conventional ECAP.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of Homogeneity in an Al-6061 Alloy Processed by ECAP and ECAP-Conform

Langdon

2014

MSF

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“…The common used methods are equal channel angular pressing or extrusion, high pressure torsion, and accumulative roll bonding [1][2][3][4][5]. Recently, the importance of ECAP has been increasingly recognized due to the unique physical and mechanical properties inherent in various ultrafine grained materials [6][7][8]. The main advantage of ECAP method is that the work-piece can be subjected to uniform and high shear strain without major change in the shape and size [9][10].…”

Section: Introductionmentioning

confidence: 99%

Effects of Inner Corner Angle on Strain Distribution of ECAPed Aluminum Alloy

Chen

Shi

2013

AMR

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Ultrafine-grained materials have excellent mechanical properties, which include the high strength and toughness. Equal channel angular pressing (ECAP) is one kind of severe plastic deformation method to make ultrafine-grained metals. The ECAP processes are simulated by finite element method (FEM) in this work. The effects of inner corner angle on strain distribution during the deformation process are numerically analyzed. The evolutions of effective strain on three points of different deformation are compared. The results show that the deformation becomes severe on each point when the inner corner angle is less than 90o, which is different from the situation when the inner corner angle is equal to or greater than 90o. The results are useful for improving the ECAP process to make the structure of metals homogenous.

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Quasi‐Linear Superelasticity with Ultralow Modulus in Tensile Cyclic Deformed TiNi Strain Glass

Zhao

Liang

et al. 2022

Adv Eng Mater

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Herein, a quasi‐linear superelasticity (≈2.3%) with the ultralow elastic modulus (≈18 GPa) over a wide temperature range (≈55 K) in tensile cyclic deformed TiNi shape memory alloys is reported. Differential scanning analysis (DSC) and dynamic mechanical analysis (DMA) show the suppression of normal martensitic transformation (MT) and the appearance of strain glass transition behavior. Electron backscatter diffraction (EBSD) analysis shows the existence of high‐density defects involving twin boundaries and dislocations under tensile cyclic deformation. Further transmission electron microscope (TEM) observation reveals stabilized B19' nanodomains after tensile cyclic deformation. The observed deformation defects and stabilized B19' nanodomains impose significant influence on the following transition behavior and mechanical property, yielding the detected quasi‐linear superelasticity with ultralow modulus. Herein, an effective way to design unique phase transitions with unprecedented properties by defect engineering may be suggested.

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Deformation behavior of consecutive workpieces in equal channel angular pressing of solid dies

Cited by 6 publications

References 20 publications

Development of Homogeneity in an Al-6061 Alloy Processed by ECAP and ECAP-Conform

Development of Homogeneity in an Al-6061 Alloy Processed by ECAP and ECAP-Conform

Effects of Inner Corner Angle on Strain Distribution of ECAPed Aluminum Alloy

Quasi‐Linear Superelasticity with Ultralow Modulus in Tensile Cyclic Deformed TiNi Strain Glass

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