Magnesium Die Casting for High Performance

Sannes, Stian; Gjestland, Haavard; Westengen, Håkon; Laukli, Hans Ivar; Lohne, O.

doi:10.1002/3527603565.ch115

Cited by 13 publications

(20 citation statements)

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“…Past research has shown that the large grains form in the shot sleeve and are injected into the die cavity during die filling. [17,[29][30][31] These large grains are therefore commonly termed ESCs. Figures 6(a) and (b) show that ESCs with both branched-dendritic and globular-rosette morphology are present in the samples.…”

Section: Resultsmentioning

confidence: 99%

“…Microstructure formation begins when the liquid alloy is poured into the shot sleeve. [17,[29][30][31] In this study, a liquid alloy with ã 80°C superheat came into contact with shot sleeve walls and a plunger tip that were at a temperature of~300°C and~250°C, respectively. The primary a-Al commonly nucleates and grows in the thermally undercooled regions adjacent to the shot sleeve walls and plunger tip.…”

Section: A Externally Solidified Crystalsmentioning

confidence: 99%

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Microstructure Formation in AlSi4MgMn and AlMg5Si2Mn High-Pressure Die Castings

Otarawanna

Gourlay

Laukli

et al. 2009

Metall Mater Trans A

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Understanding microstructure formation during high-pressure die casting (HPDC) is important for the effective quality control of high-pressure diecast aluminum-alloy components for highintegrity applications. In this study, two HPDC-specific aluminum alloys, AlSi4MgMn and AlMg5Si2Mn, were cast into tensile test bars by cold-chamber (CC) HPDC. The microstructures of the tensile bar specimens were characterized at different length scales, from the scale of the casting to the scale of the eutectic interlamellar spacing. The results show that the salient ascast microstructural features, e.g., externally solidified crystals (ESCs), defect bands, the surface layer, grain size distribution, porosity, and hot tears were similar for both alloys. The formation of these features can be understood by considering the influence of flow and solidification during each stage of the HPDC process.

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Section: Resultsmentioning

confidence: 99%

Section: A Externally Solidified Crystalsmentioning

confidence: 99%

Microstructure Formation in AlSi4MgMn and AlMg5Si2Mn High-Pressure Die Castings

Otarawanna

Gourlay

Laukli

et al. 2009

Metall Mater Trans A

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“…This showed that using 5 discrimination and, to a lesser extent, 10 , gave a false identification of tiny grains. On the other hand, 5 discrimination would occasionally split large grains at low-angle grain boundaries, while 10 and 15 would sometimes result in counting of apparently different adjacent grains as a single larger one. These would bias the distributions somewhat, although the numbers involved were few enough to result in only minor differences in the mean grain size.…”

Section: Methodsmentioning

confidence: 99%

“…Second, many authors have noted that magnesium high pressure die castings have a ''skin'', and some have claimed that it is characterised by an especially small grain size. 8) The skin is believed to increase the strength and ductility of castings; [8][9][10] measurements of the grain size variation with depth below the surface are required to test this claim and to assess the importance of such a finegrained region on tensile properties.…”

Section: Introductionmentioning

confidence: 99%

Grain Size Measurements in Mg-Al High Pressure Die Castings Using Electron Back-Scattered Diffraction (EBSD)

et al. 2004

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Optical metallographic techniques for grain-size measurement give unreliable results for high pressure diecast Mg-Al alloys and electron back-scattered diffraction mapping (EBSD) provides a good tool for improving the quality of these measurements. An application of EBSD mapping to this question is described, and data for some castings are presented. Ion-beam milling was needed to prepare suitable samples, and this technique is detailed. As is well-known for high pressure die castings, the grain size distribution comprises at least two populations. The mean grain size of the fine-grained population was similar in both AZ91 and AM60 and in two casting thicknesses (2 mm and 5 mm) and, contrary to previously published reports, it did not vary with depth below the surface.

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“…The die cavity filling process in HPDC technology is of strongly turbulent character, so that gases present in the die cavity or injection system are being entrapped in castings in the form of blowholes. Modern HPDC machines are equipped with multipliers also called cylinder intensifiers which increase the cavity pressure even by several times within miliseconds from the end of filling to exert high hydraulic pressure on the solidifying metal, thus reducing the volume of blowholes and gas porosity [12,13].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Home Scrap on Porosity of MgAl9Zn1 Alloy Pressure Castings

Konopka

Chojnacki

Łągiewka

et al. 2017

Archives of Foundry Engineering

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The work presents the results of examinations concerning the influence of various amounts of home scrap additions on the porosity of castings made of MgAl9Zn1 alloy. The fraction of home scrap in the metal charge ranged from 0 to 100%. Castings were pressure cast by means of the hot-chamber pressure die casting machine under the industrial conditions in one of the domestic foundries. Additionally, for the purpose of comparison, the porosity of specimens cut out directly of the MgAl9Zn1 ingot alloy was also determined. The examinations consisted in the qualitative assessment of porosity by means of the optical microscopy and its quantitative determination by the method of weighting specimens in air and in water. It was found during the examination that the porosity of castings decreases with an increase in the home scrap fraction in the metal charge. The qualitative examinations confirmed the beneficial influence of the increased home scrap fraction on the porosity of castings. It was concluded that the reusing of home scrap in a foundry can be a good way of reduction of costs related to the production of pressure castings.

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Magnesium Die Casting for High Performance

Cited by 13 publications

References 0 publications

Microstructure Formation in AlSi4MgMn and AlMg5Si2Mn High-Pressure Die Castings

Microstructure Formation in AlSi4MgMn and AlMg5Si2Mn High-Pressure Die Castings

Grain Size Measurements in Mg-Al High Pressure Die Castings Using Electron Back-Scattered Diffraction (EBSD)

The Influence of Home Scrap on Porosity of MgAl9Zn1 Alloy Pressure Castings

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