Improving mechanical properties of chip-based aluminum extrudates by integrated extrusion and equal channel angular pressing (iECAP)

Haase, Matthias; Khalifa, Nooman Ben; Tekkaya, A. Erman; Misiolek, W.Z.

doi:10.1016/j.msea.2012.01.081

Cited by 109 publications

(88 citation statements)

References 23 publications

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“…This process is dependent mainly on the shape and thickness of the chips. The compaction of the particles in the (semi) a pin are achieved varying bulk density of approximately 80% [4,6], it is according to the size of the pre-product and compacting pressure. Fig.3 displayed density change of chip billets during forward extrusion.…”

Section: Finite Element Modellingmentioning

confidence: 99%

“…The hot extrusion process can be used to direct conversion of aluminum chips to final products. Several papers [4][5][6] reported that direct extrusion with a lower ratio of 12:1 is not sufficient to establish a coherent / fixed connection between the chips. Due to the implementation of a new technologies operation, such as SPD (severe plastic deformation), into forward extrusion process.…”

Section: Introductionmentioning

confidence: 99%

“…To a continuous process forward fit is possible to implement a number of methods such as equal channel angular pressing (ECAP) [7][8][9][10][11][12][13][14], twist extrusion (TE) [15][16][17], or friction stir processing called as KOBO [18,19]. Authors [6,20] achieved superior bonding quality of chip-based extrudates byintegrated aluminum extrusion and equal channel angular pressing (iECAP) at the low extrusion ratio of ~8.7: first Well properties are achieved by extruding through feeder porthole die, with two or four feeder [4][5][6]21]. Authors [4] reported that for the welding of the chips two criterions must be fulfilled.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Various Possibilities of the Hot Extrusion in Aluminum Chips Processing

Kočiško

Bidulský

Dragošek

et al. 2014

Acta Metall Slovaca

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This article deals with the analysis and comparison of the conditions for solid state welding during extrusions by means of numerical simulation. Numerical simulations made on four different matrices, such as square die without integrated extrusion and equal channel angular pressing (iECAP), porthole die whit one and four square profile. Maximum volume and distribution of effective strain, strain rate and shear stress was analyzing. The results show that during cold molding of chips there is mutual deformations of chips, which are rearranged and mechanically crimped. In the first phase of pressing occurs complete elimination of porosity. The square die with iECAP was extrusion force is 30% higher than porthole die. Maximum effective strain was calculated for the porthole die whit four square profile.

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Section: Finite Element Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Various Possibilities of the Hot Extrusion in Aluminum Chips Processing

Kočiško

Bidulský

Dragošek

et al. 2014

Acta Metall Slovaca

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“…Lenka Nevertheless, uniformity of strain distribution across the cross-section of a processed material after a single ECAP pass can be relatively low [24]. By this reason, an ECAP pass can advantageously be combined either with subsequent passes, or with another SPD component to increase the efficiency and imposed strain uniformity [25,26]. Considering ECAP-based methods, the structure refinement is generally greater with a higher imposed strain.…”

Section: Introductionmentioning

confidence: 99%

Natural ageing of aluminium processed by twist channel angular pressing

Kunčická¹,

Kocich²

2017

Fifth International Conference on Advances in Civil, Structural and Mechanical Engineering - CSM 2017

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-The method of twist channel angular pressing (TCAP) was invented with the aim to increase the efficiency of single pass severe plastic deformation (SPD) technologies. The study shows the structure of TCAP-processed aluminium after processing and the changes developed in the structure after a year of natural ageing at room temperature. The grain refinement after a single pass TCAP was very significant due to effectively imposed shear strain; the majority of grains were smaller than 5μm. The grains further showed sub-structure featuring fine precipitates, accumulated dislocations and developed subgrains. Transmission electron microscopy of the one-year-aged samples showed increased precipitation; the precipitates acted as effective obstacles for grain growth and structure recovery. The microscopy results were supplemented with microhardness measurements, the results of which showed a significant hardening for the single pass TCAP, after which the average microhardness increased from 44.6 HV to more than 91 HV.

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“…The first stage of processing is therefore very important. The most widely-used methods for extruding of compacted chips are forward extrusion [17,18], extrusion through bridge dies [2,4,13], and new technologies, such as equal channel angular pressing (ECAP) [20][21][22][23] and friction stir wire extrusion [24].…”

Section: Introductionmentioning

confidence: 99%

A Compacting Process of the en Aw 6060 Alloy

et al. 2015

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Abstract. This study reports on an investigation of factors affect the process of compacting Al chips which are used to direct scrap processing through the forward extrusion method. EN AW 6060 chips of different geometry and types were mainly used as the experimental material. The chips were compacted in a die with a vertical channel (10.3 mm in diameter). To provide a range of processing conditions, three different weights were selected and compacting was performed under five, different compacting pressures. The movement of the chips within the die during compacting was analysed through numerical simulations using Deform 2D software. Study of the compacting process optimal parameters for increasing the density and enhancing the density distribution were defined. The results from our study clearly show that optimal conditions are obtained when the proportion of D/h is 1/1.1. Moreover, it was recognized that in the process of small chips compacting, there was obtained lower density than in the case of large chips.

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Improving mechanical properties of chip-based aluminum extrudates by integrated extrusion and equal channel angular pressing (iECAP)

Cited by 109 publications

References 23 publications

Various Possibilities of the Hot Extrusion in Aluminum Chips Processing

Various Possibilities of the Hot Extrusion in Aluminum Chips Processing

Natural ageing of aluminium processed by twist channel angular pressing

A Compacting Process of the en Aw 6060 Alloy

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