Constrained groove pressing and its application to grain refinement of aluminum

Shin, Dong Hyuk; Park, Jong-Jin; Kim, Yong-Seog; Park, Kyung‐Tae

doi:10.1016/s0921-5093(01)01665-3

Cited by 364 publications

(190 citation statements)

References 11 publications

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“…In this process, the sheet material is subjected to repetitive shear deformation under plastic strain deformation condition by alternate pressing with asymmetrically grooved dies and flat dies 45 .…”

Section: Superplastic Formingmentioning

confidence: 99%

Innovative forming and fabrication technologies : new opportunities.

Davis¹,

Hryn²

2008

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Executive SummaryThe state of technology in the field of fabrication and materials forming is reviewed. The purpose of this work is to identify new fields of Research & Development (R&D) that can lead to a significant reduction in energy consumption. This report, based on an extensive literature survey, identifies sheet aluminum alloy manufacturing, forming, and applications as a core aspect, but also highlights other types of sheet metal alloys and materials.This study found that aluminum alloy sheet manufacturing by the direct chill (DC) casting process is a mature technology where only marginal energy savings can be expected. Energy savings in this field can be accomplished mainly by individual plant wide assessments of energy consumption followed by optimization work. A possible breakthrough would come from advanced melting techniques such as plasma heating. As well, immersion heaters were recently identified as showing potential. An emerging technology in sheet manufacturing is spray rolling. The process could save 4.6x1012 kJ per year of energy for the U.S. aluminum industry. Even though the process has been proven to be technically feasible, the industrial implementation of spray rolling might need a significant effort. Improvements to the twin-roll casting process by coupling it with rheocasting could be an interesting method that would be easier to implement on the industrial scale.Extensive research has been performed to develop processes capable of forming commercial aluminum alloys for applications in the automotive industry. The following processes are considered advanced forming technologies: superplastic forming, electromagnetic forming, age forming, warm forming, and hydroforming. They are not necessarily new but can be regarded as emerging technologies with respect to their application to aluminum alloys. Superplastic forming is already being used industrially; however, simple and inexpensive manufacturing methods for the production of superplastic aluminum sheets still require further development. Any breakthrough in the forming of sheet materials will most likely come from the development of new alloys with very high formability at low temperature or the development of processing techniques to improve formability of existing alloys that will relax the stringent requirements of the forming techniques themselves. To have significant achievements in alloy development, thermodynamic models must be developed (or improved). The recent developments in quantum physics applied to aluminum alloys could pave the way for very efficient alloy development.Aluminum alloys are currently the material of choice to reduce weight in the automotive industry because of their commercial availability and the maturity of the aluminum industry. Opportunities still exist in the field of lightweight materials having high specific strength. Among those materials are magnesium alloys. Magnesium alloys could allow for further weight savings but high formability and high corrosion resistant alloys must be developed to overc...

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Section: Superplastic Formingmentioning

confidence: 99%

Innovative forming and fabrication technologies : new opportunities.

Davis¹,

Hryn²

2008

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“…These include equal channel angular pressing [6], high pressure torsion [2], twist extrusion [7], accumulative roll bonding [8] and constrained groove pressing [9]. The fundamental principle of all SPD methods is the same.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of three different tube equal channel angular pressing techniques

Djavanroodi¹,

ZOLFAGHARI²,

Ebrahimi³

2021

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“…Based on the geometry of the work-piece, SPD techniques can be divided into the three groups nominating bulk, sheet, and tube classifications. For group 1: equal channel angular pressing (ECAP) [1], high pressure torsion (HPT) [2], twist extrusion (TE) [6], accumulative back extrusion (ABE) [7]; for group 2: equal channel angular rolling (ECAR) [8], accumulative roll bonding (ARB) [9], constrained groove pressing (CGP) [10]; and for group 3: high pressure tube twisting (HPTT) [11], accumulative spin bonding (ASB) [12], tubular channel angular pressing (TCAP) [13] are the major examples. It should be pointed out that the principal rule of all SPD methods consists of imposing shear stress to the sample, increasing the dislocation density in deformed material, formation of dense dislocation walls and then low angle grain boundaries (LAGBs), and, finally, transformation of LAGBs into high angle grain boundaries (HAGBs) [1,[14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Equal Channel Forward Extrusion Process

Ebrahimi

Djavanroodi

Tiji

et al. 2015

Metals

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Among all recognized severe plastic deformation techniques, a new method, called the equal channel forward extrusion process, has been experimentally studied. It has been shown that this method has similar characteristics to other severe plastic deformation methods, and the potential of this new method was examined on the mechanical properties of commercial pure aluminum. The results indicate that approximate 121%, 56%, and 84% enhancements, at the yield strength, ultimate tensile strength, and Vickers micro-hardness measurement are, respectively, achieved after the fourth pass, in comparison with the annealed condition. The results of drop weight impact test showed that the increment of 26% at the impact force, and also decreases of 32%, 15%, and 4% at the deflection, impulse, and absorbed energy, are respectively attained for the fourth pass when compared to the annealed condition. Furthermore, the electron backscatter diffraction examination revealed that the average grain size of the final pass is about 480 nm.

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Constrained groove pressing and its application to grain refinement of aluminum

Cited by 364 publications

References 11 publications

Innovative forming and fabrication technologies : new opportunities.

Innovative forming and fabrication technologies : new opportunities.

Experimental investigation of three different tube equal channel angular pressing techniques

Experimental Investigation of the Equal Channel Forward Extrusion Process

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