Effect of runner design on the externally solidified crystals in vacuum die-cast Mg-3.0Nd-0.3Zn-0.6Zr alloy

Zhou, Yuqi; Guo, Zhipeng; Xiong, Shengwu

doi:10.1016/j.jmatprotec.2018.12.032

Cited by 16 publications

(2 citation statements)

References 15 publications

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“…The segregation of externally solidified crystals (ESCs) is relatively common in HPDC lightweight alloys [10,11]. ESCs arise from two sources: (i) crystals solidified due to temperature decrease when the melt is held in a cold chamber before the filling process; (ii) solid particles in the semi-solid slurry during HPDC [12].…”

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confidence: 99%

Modelling flow-induced microstructural segregation in semi-solid metals

Fonseca

et al. 2022

Materials & Design

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confidence: 99%

Modelling flow-induced microstructural segregation in semi-solid metals

Fonseca

et al. 2022

Materials & Design

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“…With an thickness of several grains, it is detrimental to the mechanical properties of die cast components. Therefore, it has aroused widespread attention of researchers [9][10][11][12][13][14][15] . The defect band is essentially a solute segregation band generally with the aggregation of shrinkage pores.…”

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confidence: 99%

Defect band formation in high pressure die casting AE44 magnesium alloy

Hou

Huang

et al. 2022

China Foundry

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The characteristics of defect bands in the microstructure of high pressure die casting (HPDC) AE44 magnesium alloy were investigated. Special attention was paid to the effects of process parameters during the HPDC process and casting structure on the distribution of defect bands. Results show that the defect bands are solute segregation bands with the enrichment of Al, Ce and La elements, which are basically in the form of Al 11 RE 3 phase. There is no obvious aggregation of porosities in the defect bands. The width of the inner defect band is 4-8 times larger than that of the outer one. The variation trends of the distribution of the inner and outer defect bands are not consistent under different process parameters and at different locations of castings. This is due to the discrepancy between the formation mechanisms of double defect bands. The filling and solidification behavior of the melt near the chilling layer is very complicated, which finally leads to a fluctuation of the width and location of the outer defect band. By affecting the content and aggregation degree of externally solidified crystals (ESCs) in the cross section of die castings, the process parameters and casting structure have a great influence on the distribution of the inner defect band.

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