Influence of intensification pressures on pores in die-cast ADC12 alloys

Wang, Chuntao; Yao, Jian; Zhao, Haidong; Yang, Runsheng

doi:10.1007/s41230-019-8171-1

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…In-situ experiments capturing the isolated gas pores at higher pressures will be carried out to validate the numerical model. However, a similar decreasing trend with pressure was observed by C. Wang et al [19]. According to the governing physics, the external pressure restricts the pore growth and the radius variation is expected to flatten at higher pressure, which can be observed in figure 2(b).…”

Section: Pressuresupporting

confidence: 82%

Numerical modelling of porosity with combined gas and shrinkage effects in HPDC

Godwal

Bhagavath²,

Ghaffari³

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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High-pressure die casting is a manufacturing process in which near-net-shape components are produced rapidly under a pressurized environment. However, due to the relatively higher cooling rate prevailing during the process, isolated liquid pockets form at certain locations, leading to increased porosity formation. A one-dimensional deformable grid numerical model has been developed for predicting the evolution of a single pore in an elementary volume, which combines the diffusion model with the shrinkage affected growth. The model accounts for the change in pore size due to shrinkage and inter-granular growth. This model can provide predictions in representative volumes and be used for component level predictions by combining with a macroscopic model.

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Section: Pressuresupporting

confidence: 82%

Numerical modelling of porosity with combined gas and shrinkage effects in HPDC

Godwal

Bhagavath²,

Ghaffari³

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Pressure die-casting appears to be a way to circumvent this issue. In this context, it seems helpful that the pores in thick-walled components such as heat sinks react more favourably to the superimposed pressure than in thin-walled ones, due to the differences in solidification rate [27].…”

Section: Discussionmentioning

confidence: 99%

Increasing thermal conductivity in aluminium-copper compound castings: Modelling and experiments

Maier

Gawlytta

Fromm

et al. 2023

Materials Science and Technology

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Compound cast heat sinks have various advantages over conventionally manufactured ones, but oxides present on the metals and formation of a brittle intermetallic layer (IMC) make casting difficult. In the present study, a novel approach was used that employs a silane-doped argon environment to overcome these issues. Oxidation could be fully suppressed and thermal heat conductivities around 67 W/(m·K) were obtained for the compound zone. The microstructural analysis revealed that the thickness of the IMC layer could be kept below the critical value of 3 µm. Yet, the process window was found to be extremely tight. The modelling revealed that the critical time period for formation of the IMC layer is only on the order of a few 10 s.

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“…The high pressure die casting (HPDC) process is a netshape forming process especially suitable for largescale production of thin-walled complex parts [1][2][3] . Although HPDC products generally have fine grains in the microstructure due to a high cooling rate during solidification, there are still unavoidable casting defects in the solidified alloy, such as gas pores [4][5][6] and externally solidified crystals (ESCs) [7,8] . Another type of unique casting defect in the microstructure of die castings is the defect band.…”

Section: Introductionmentioning

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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Influence of intensification pressures on pores in die-cast ADC12 alloys

Cited by 7 publications

References 19 publications

Numerical modelling of porosity with combined gas and shrinkage effects in HPDC

Numerical modelling of porosity with combined gas and shrinkage effects in HPDC

Increasing thermal conductivity in aluminium-copper compound castings: Modelling and experiments

Defect band formation in high pressure die casting AE44 magnesium alloy

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