The Process of Co-Extrusion – An Analysis

Kittner, Kristina; Awiszus, Birgit

doi:10.4028/www.scientific.net/kem.491.81

Cited by 10 publications

(12 citation statements)

References 11 publications

(11 reference statements)

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“…2 shows the results of a dye penetration test for a damaged compound (left hand side, red areas) and an impeccable compound (right hand side, no fractures occur). impeccable compound [4] The interface, the bonding zone between the aluminum and the magnesium, consists of two intermetallic phases of the Al-Mg metallurgical system. The first phase is the gamma-phase Al3Mg2 and the second phase is the beta-phase Al12Mg17.…”

Section: Co-extrusionmentioning

confidence: 99%

“…The quality of the compound can be determined by different tests, like visual inspection, ultrasonic testing, light microscopy analysis and dye penetration test. Thereby, the dye penetration test is an easy to use as well as standardized method and was used in all investigations [2][3][4][5][6]. A disadvantage of the dye penetration test is the destructive character of this method.…”

Section: Co-extrusionmentioning

confidence: 99%

“…The manufacturing process was performed by hydrostatic co-extrusion [1][2][3][4][5][6]. The pre-assembled billet, consisting of an aluminum sleeve (AlMgSi1) and a magnesium core (AZ31), is extruded indirectly (force of hydrostatic medium) through a conic die.…”

Section: Co-extrusionmentioning

confidence: 99%

“…Additionally applied layers of zinc or titanium between core and sleeve material did not further improve the compound quality. Kittner et al [2,3,4,5] analyzed the same material combination of AlMgSi1 and AZ31 by hydrostatic co-extrusion. By means of experimental and numerical investigations the main influencing parameters for a sufficient compound quality was determined.…”

Section: Introductionmentioning

confidence: 99%

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Recent Developments for the Production of Al-Mg Compounds

Kittner

Feuerhack

Förster

et al. 2015

Materials Today: Proceedings

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The changes of ecological awareness of political initiatives give new rules for economy and industry with the aim to support environmental friendly technology. Research projects are focusing on lightweight designs especially in automotive and aerospace industry. This paper deals with the results of the application of lightweight materials, in detail with aluminum-magnesium-compounds and its manufacturing process. Thereby, the process chain from the production of semi-finished parts and the first subsequent process will be explained in detail with focusing on the modification of the intermetallic interface. The combination of hydrostatic co-extrusion and subsequent performed forging is an auspicious approach for the production of lightweight parts made of Al-Mg-compounds. In this contribution the main influencing parameters, experimental and numerical work, interface properties as well as the process analysis will be explained in detail.

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Section: Co-extrusionmentioning

confidence: 99%

Section: Co-extrusionmentioning

confidence: 99%

Section: Co-extrusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent Developments for the Production of Al-Mg Compounds

Kittner

Feuerhack

Förster

et al. 2015

Materials Today: Proceedings

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“…The hydrostatic co-extrusion process of Al-Mg material composites was extensively investigated by Kittner [24][25][26]. The container of the press limited the dimensions of the pressing billet to a length of 290 mm and an outer diameter of 80 mm.…”

Section: Hydrostatic Co-extrusionmentioning

confidence: 99%

Process Chain for the Production of a Bimetal Component from Mg with a Complete Al Cladding

Förster

Binotsch

Awiszus

2018

Metals

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With respect to its density, magnesium (Mg) has a high potential for lightweight components. Nevertheless, the industrial application of Mg is limited due to, for example, its sensitivity to corrosion. To increase the applicability of Mg, a process chain for the production of a Mg component with a complete aluminum (Al) cladding is presented. Hydrostatic co-extrusion was used to produce bar-shaped rods with a diameter of 20 mm. The bonding between the materials was verified by ultrasonic testing. Specimens with a length of 79 mm were cut off from the rods and forged by using a two-staged process. After the first step (Heading), the Mg core was removed partially by drilling to ensure a complete enclosing of the remaining Mg during the second forging step (Net shape forging). The geometry of the drilling hole and the heading die design were dimensioned with the Finite Element-simulation software FORGE. Hence, a complete Al-enclosed Mg component was achieved by using the described process chain and forming processes. Microstructural investigations confirm the formation of an intermetallic interface as expected.

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Influence of the process parameters on the forming result in indirect extrusion of semi‐finished products of aluminum‐magnesium compounds

Neugebauer

Porstmann²,

Glaß

et al. 2012

Materialwissenschaft Werkst

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Based on previous preliminary tests for the production of semi-finished products of Al-Mg compounds by indirect extrusion [9], the testing program was extended and further specified. In addition to varying the process parameters, analog tests for the investigation of intermetallic phases are presented. The extended test series investigate the influence of a new combination of lubricants, the initial temperature of the extrusion billet and an integrated cooling path on compound quality and strand surface. A main aspect of compound generation is the formation of intermetallic phases. In order to investigate the origin, distribution and characteristics of these phases compounds were generated by diffusion soldering. This method prevents the effects of inhomogeneous surface area increase which can occur during the formation of compounds by forming. Furthermore, inserting intermediate layers becomes much easier. These intermediate layers have considerable influence on the formation of intermetallic phases. Moreover, reproducibility of the metal compounds generated by indirect extrusion of the tested aluminum and magnesium alloys can be ensured. The process window allowing for the formation of completely bound semi-finished strand products is very narrow. Here it is especially important to ensure constant tribological conditions during forming

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The Process of Co-Extrusion – An Analysis

Cited by 10 publications

References 11 publications

Recent Developments for the Production of Al-Mg Compounds

Recent Developments for the Production of Al-Mg Compounds

Process Chain for the Production of a Bimetal Component from Mg with a Complete Al Cladding

Influence of the process parameters on the forming result in indirect extrusion of semi‐finished products of aluminum‐magnesium compounds

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