Formation of defect bands in high pressure die cast magnesium alloys

Dahle, A. K.; Sannes, Stian; John, D. H. St; Westengen, Håkon

doi:10.1016/s1471-5317(01)00002-5

Cited by 105 publications

(58 citation statements)

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“…However, the present study illustrated the experimental results of compositional inhomogeneities, which were different from those of previously known. 16,27,28) Figure 2 had confirmed that there existed cooling rate gradient across the casting plate from the chill block surface to the riser. In the ''with chill block'' plate, the cooling rates with respect to the distance from riser had a rapid increasing tendency.…”

Section: Resultsmentioning

confidence: 87%

“…16) Composition profile of variation in Al content from surface to center in high pressure die-cast AM50 magnesium bars has been elucidated. 27) The Al content decreased from about 5 mass% at chill surface to about 2.5 mass% in center. Similar experimental results were explored by Nakatsugawa et al 28) where enrichment of Al content in the vicinity of surface was found at die-cast and thixomolded specimens.…”

Section: Resultsmentioning

confidence: 93%

“…Similar experimental results were explored by Nakatsugawa et al 28) where enrichment of Al content in the vicinity of surface was found at die-cast and thixomolded specimens. The preceding studies 16,27,28) reported that an enrichment of alloying element occurred in the region near the mold wall where cooling rate was higher than the interior position of the casting. However, the present study illustrated the experimental results of compositional inhomogeneities, which were different from those of previously known.…”

Section: Resultsmentioning

confidence: 96%

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Effect of Cooling Rate on Mg17Al12 Volume Fraction and Compositional Inhomogeneity in a Sand-Cast AZ91D Magnesium Plate

2006

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Mg 17 Al 12 compound is a hardening phase in AZ91D alloy. Moreover, the concentration of Al and Zn has been found to be closely related to the corrosion performance of the magnesium alloy. The aim of this work was to study the effect of cooling rate on distribution of Mg 17 Al 12 compound and compositional inhomogeneity in an AZ91D magnesium sand-cast plate (200 Â 140 Â 20 mm 3 ). A copper chill block, which was placed at the end of mold cavity, was used to increase the cooling rate during solidification. A sand-cast plate was also produced, where no chill block being mounted at the end of mold cavity. The ''with chill block'' plate showed a rapid increasing in cooling rate with respect to distance from riser, as compared to the ''without chill block'' plate where almost no cooling rate fluctuation occurred. The volume fraction of Mg 17 Al 12 ( phase) in the ''without chill block'' plate was higher than that in ''with chill block'' plate. In the ''without chill block'' plate, volume fraction of Mg 17 Al 12 was about 13.9 vol% (near the riser) to about 19.3 vol% (close to the end of the plate). However, the ''with chill block'' plate was solidified in a higher cooling rate, leading to low volume fraction of the phase (13.4 vol%). Higher cooling rate also resulted in more severe compositional inhomogeneity in the sand-cast plate. The Al and Zn concentration in the ''with chill block'' plate showed a concave downward dependence against the distance to riser. Moreover, in the ''with chill block'' plate, concentrations of Al and Zn did not enrich at the position near chill face. Instead, the Al and Zn contents near the chill surface were well below the average value. This finding is in disagreement with previous studies.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 96%

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Effect of Cooling Rate on Mg17Al12 Volume Fraction and Compositional Inhomogeneity in a Sand-Cast AZ91D Magnesium Plate

2006

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“…High-pressure die-cast magnesium components are being increasingly used because of their excellent cast ability and the properties that magnesium offers. The high-pressure diecasting of thin-walled components is particularly suitable because of the excellent flow characteristics of molten magnesium alloys [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…The melting of magnesium is also different from other metals because it requires protection against surface oxidation. It should be noted that magnesium and aluminum die-casting alloys also possess different chemical and physical properties, which require modifications in the injection parameters and die design [2][3][4]8]. The lower density of magnesium vs. aluminum signifies that the inertia is lower, and for the same metal pressure a higher flow speed results.…”

Section: Introductionmentioning

confidence: 99%

Mg-Al-RE Magnesium Alloys for High-Pressure Die-Casting

Braszczyńska-Malik¹

2014

Archives of Foundry Engineering

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Experimental Mg-Al-RE type magnesium alloys for high-pressure die-casting are presented. Alloys based on the commercial AM50 magnesium alloy with 1, 3 and 5 mass % of rare earth elements were fabricated in a foundry and cast in cold chamber die-casting machines. The obtained experimental casts have good quality surfaces and microstructure consisting of an α(Mg)-phase, Al 11 RE 3 , Al 10 RE 2 Mn 7 intermetallic compound and small amount of α+γ eutectic and Al 2 RE phases.

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