Recycling of AlSi8Cu3 alloy chips via high pressure torsion

Aal, Mohamed Ibrahim Abd El; Yoon, Eun Yoo; Kim, Hyoung Seop

doi:10.1016/j.msea.2012.09.045

Cited by 40 publications

(26 citation statements)

References 40 publications

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“…In addition, recycling processes based on other SPD methods such as cyclic extrusion compression (CEC) [16], equal channel angular pressing (ECAP) [17][18][19], high-pressure torsion (HPT) [20] or compressive torsion [21], and combined use of forward extrusion and ECAP [22,23] have also been reported. Recently, another study [24] aimed at producing a composite material including nano-particles from machining chips via hot extrusion, and a new method was proposed to produce clad plates from iron chips by using hot rolling [25].…”

Section: Introductionmentioning

confidence: 99%

Solid-state recycling of aluminium alloy swarf into c-channel by hot extrusion

Chiba

Yoshimura

2015

Journal of Manufacturing Processes

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Section: Introductionmentioning

confidence: 99%

Solid-state recycling of aluminium alloy swarf into c-channel by hot extrusion

Chiba

Yoshimura

2015

Journal of Manufacturing Processes

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“…A finer grain size increases the strength and the fracture toughness of the material [11]. SPD processes commonly used for SSR are: Equal channel angular pressing (ECAP) [12,13], cyclic extrusion compression (CEC) [14], and high pressure torsion (HPT) [15]. Lately, new and promising methods for SSR are arising such as friction stir extrusion (FSE) [16] and friction stir consolidation (FSC) [17].…”

mentioning

confidence: 99%

Statistical Analysis of the Combined ECAP and Heat Treatment for Recycling Aluminum Chips Without Remelting

Krolo

Lela

Dumanić

et al. 2019

Metals

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The main aim of this paper is to present an environmentally friendly method for aluminum recycling. Development of new recycling technologies in order to increase scrap reuse potential and CO 2 emission savings are of the main importance for aluminum circular economy. In this paper, aluminum chips waste was recycled without any remelting phase in order to increase energy and material savings. The presented process is usually called solid state recycling or direct recycling. Solid state recycling process consists of chips cleaning, cold pre-compaction and hot direct extrusion followed by a combination of equal channel angular pressing (ECAP) and heat treatment. Influence of holding time during solid solution treatment and both artificial aging time and temperature on mechanical properties of the recycled EN AW 6082 aluminum chips were investigated. A comprehensive number of the experiments were performed utilizing design of experiments approach and response surface methodology. Regression models were developed for describe the influence of heat treatment parameters for presented solid state recycling process on mechanical properties of the recycled samples. Utilizing novel procedure high quality recycled samples were obtained with mechanical properties comparable with commercially produced EN AW 6082 aluminum alloy in T6 temper condition. Metallographic analysis of the recycled samples was also performed.In order to reduce the negative effect on the environment, various authors recognized solid state recycling (SSR) as a possible alternative to the conventional aluminum recycling process [4][5][6][7][8][9]. When SSR is employed, material losses are much smaller because the remelting phase is completely avoided. Aluminum is a highly reactive material and it has a tendency to form aluminum oxide on its surface. This is even more pronounced for lightweight aluminum scrap due to its high surface to mass ratio. During the remelting process this oxide is floating on the melt surface mixed with dross. Therefore, aluminum lightweight scrap (chips, foils, and sheet skeletons) is problematic when conventional recycling technology is used because up to 20% of the aluminum can be lost due to the mixing with dross and burning [9]. According to previous research papers concerned with SSR process, it is possible for material yield to be over 90% when this type of recycling is employed, while energy consumption can be only 10% compared to conventional recycling process that uses remelting [6][7][8]. Furthermore, manufacturing profiles from solid state bonded chips gives a 96% saving in CO 2 emission compared to production from billets made by conventional recycling of aluminum manufacturing waste [8]. In order to produce SSR samples with appropriate quality, the combination of the high temperature, normal stress, shear stress, and plastic deformation should be achieved [6,7]. Therefore, the most used process for SSR is direct hot extrusion, but lately severe plastic deformation (SPD) processes opened new possibilities [10]. SPD i...

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“…For example, a process of severe plastic deformation (SPD) termed high-pressure torsion was found to be effective to consolidate machining chips of pure copper and AlSi 8 Cu 3 alloy. 2,3) These paper demonstrated that the introduction of SPD could be possibly a beneficial way for improving the recycling value of hard-to-deform titanium.…”

Section: Introductionmentioning

confidence: 88%

Microstructure Formation Driven by Stored Energy and Mechanical Property of Pure Titanium Recycled from Chips by Severe Plastic Deformation

Luo

2019

Mater. Trans.

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It is of practical significance to improve the recycling value of hard-to-deform titanium wastes by means of melting-free technologies. One such technology, severe plastic deformation in the form of equal channel angular pressing (ECAP) was used to consolidate chips of commercial purity titanium. Electron backscatter diffraction (EBSD) was used to resolve the microstructure into high angle grain boundaries (HAGBs, with misorientation ²15°) and low angle grain boundaries (LAGBs, <15°). The strain energy stored in HAGBs and LAGBs were considered to be the primary driving force of dynamic recovery (DRV) and dynamic recrystallization (DRX). As a result of DRV and DRX, the formation of microstructure was analyzed by evaluating the stored energy for various ECAP conditions. The ductility of the recycled titanium was analyzed by verifying the failure mode according to the inspection of the fracture surface of the tensioned specimen with scanning electron microscopy.

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Recycling of AlSi8Cu3 alloy chips via high pressure torsion

Cited by 40 publications

References 40 publications

Solid-state recycling of aluminium alloy swarf into c-channel by hot extrusion

Solid-state recycling of aluminium alloy swarf into c-channel by hot extrusion

Statistical Analysis of the Combined ECAP and Heat Treatment for Recycling Aluminum Chips Without Remelting

Microstructure Formation Driven by Stored Energy and Mechanical Property of Pure Titanium Recycled from Chips by Severe Plastic Deformation

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