The effect of aluminium content on the eutectic morphology of high pressure die cast magnesium–aluminium alloys

Dargusch, Matthew S.; Nave, Mark; McDonald, Stuart D.; StJohn, David H.

doi:10.1016/j.jallcom.2009.11.199

Cited by 25 publications

(14 citation statements)

References 9 publications

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“…This is in good agreement with results found here, since the solidification rates and ␤-phase quantity both increased in the following order TRC → HPDC → Thixomolding ® . According to Dargusch et al [36], the volume fraction of the ␤-phase increases with an increasing Al content in the alloy. Thus, the lowest volume fraction of ␤-phase should be found in Thixomolding ® , as it has the lowest total Alcontent of the three investigated materials.…”

Section: Quantity and Distribution Of The ˇ-Phasementioning

confidence: 97%

The influence of manufacturing processes on the microstructure and corrosion of the AZ91D magnesium alloy evaluated using a computational image analysis

Zander

Schnatterer

2015

Corrosion Science

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Section: Quantity and Distribution Of The ˇ-Phasementioning

confidence: 97%

The influence of manufacturing processes on the microstructure and corrosion of the AZ91D magnesium alloy evaluated using a computational image analysis

Zander

Schnatterer

2015

Corrosion Science

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“…1 J a n u a r y 2 0 1 8 Overseas Foundry morphology and distribution of the divorced Mg-Al eutectic remarkably affect the performance of die castings, particularly the ductility, corrosion resistance, high temperature strength and creep resistance [17,18] . In view of the above situation, indepth experimental studies have been conducted on the microstructure characteristics of the divorced eutectic of die cast magnesium alloy [19][20][21] . However, few simulation works have been reported on formation of the divorced Mg-Al eutectic until now.…”

Section: *Lin Huamentioning

confidence: 99%

Modeling studies on divorced eutectic formation of high pressure die cast magnesium alloy

Hua

Xiong

2018

China Foundry

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A s the lightest known structural metals, magnesium alloys have attracted much attention due to their superior properties such as low density, high specific strength, excellent castability, good machinability and recyclability [1,2] . Magnesium alloys have been widely used in automotive, aerospace and 3C (computer, communication and consumer electronics) industries to replace steel, cast iron and even aluminum alloy [3] . The high pressure die casting (HPDC) process is a netshape or near net-shape process with the advantages of high efficiency, considerable economic benefit and high precision of the product size. These remarkable advantages make the HPDC process particularly suitable for various complex productions with magnesium alloys, and generally, magnesium alloy parts are mainly formed by the HPDC process [4] .The performance of magnesium alloy die castings Abstract:The morphology and content of the divorced eutectic in the microstructure of high pressure die casting (HPDC) magnesium alloy have a great influence on the final performance of castings. Based on the previous work concerning simulation of the nucleation and dendritic growth of primary α-Mg during the solidification of magnesium alloy under HPDC process, an extension was made to the formerly established CA (Cellular Automaton) model with the purpose of modeling the nucleation and growth of Mg-Al eutectic. With a temperature field and solute field obtained during simulation of the primary α-Mg dendrites as the initial condition of the modified CA model, modeling of the Mg-Al eutectic with a divorced morphology was achieved. Moreover, the simulated results were in accordance with the experimental ones regarding the distribution and content of the divorced eutectic. Taking a "cover-plate" die casting with AM60 magnesium alloy as an example, the rapid solidification with a high cooling rate at the surface layer of the casting led to a fine and uniform grain size of primary α-Mg, while the divorced eutectic at the grain boundary revealed a more dispersed and granular morphology. Islands of divorced eutectic were observed at the central region of the casting, due to the existence of ESCs (Externally Solidified Crystals) which contributed to a coarse and non-uniform grain size of primary α-Mg. The volume percentage of the eutectic β-Mg 17 Al 12 phase is about 2%-6% in the die casting as a whole. The numerical model established in this study is of great significance to the study of the divorced eutectic in the microstructure of die cast magnesium alloy.

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“…AZ91 is one of the most popular Mg alloys for current commercial applications, offering a good combination of castability, corrosion resistance and mechanical properties compared to other Mg alloys [1][2][3][4]. The microstructure of AZ91 typically contains a matrix of α-Mg grains and the second β phase particles (consisting of the intermetallic Mg 17 Al 12 ) distributed along the α-Mg grain boundaries [5][6][7][8][9][10][11][12]. The typical β particle in the microstructure of die-cast AZ91 is typically surrounded by an Al-rich-α area [7][8][9][10][11][12], and the final microstructure consists of an α-Mg matrix, coarse β particles and Al-rich-α areas.…”

Section: Introductionmentioning

confidence: 99%

Formation and characteristic corrosion behavior of alternately lamellar arranged α and β in as-cast AZ91 Mg alloy

Zhao

et al. 2019

Journal of Alloys and Compounds

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Formation and characteristic corrosion resistance of alternately lamellar arranged α and β in as-cast AZ91 Mg alloy were investigated as an independent micro-constituent identity. As-cast AZ91 presented three microstructural entities, i.e. α-Mg grain, (α+β) lamellae and coarse β particle, and each had its own Al content and microstructural morphology. The lamellae occurrence was due to the precipitation of β particle from the divorced eutectic Al-rich-α phase during solidification, because the Al composition can not exceed its maximum solubility. The evidences that were obtained from electrochemical tests, micro-corrosion morphology and hydrogen evolution rate certified that the (α+β) lamellae was beneficial to corrosion resistance, which was different from the reported deleterious influence for its original eutectic Al-rich-α phase. This different corrosion behavior was explained to be ascribed to the changes in fine structure and local composition that resulted in combined electrochemical effects of the changes in α and β phases on the corrosion.

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The effect of aluminium content on the eutectic morphology of high pressure die cast magnesium–aluminium alloys

Cited by 25 publications

References 9 publications

The influence of manufacturing processes on the microstructure and corrosion of the AZ91D magnesium alloy evaluated using a computational image analysis

The influence of manufacturing processes on the microstructure and corrosion of the AZ91D magnesium alloy evaluated using a computational image analysis

Modeling studies on divorced eutectic formation of high pressure die cast magnesium alloy

Formation and characteristic corrosion behavior of alternately lamellar arranged α and β in as-cast AZ91 Mg alloy

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