Grain Size Distribution and Interfacial Heat Transfer Coefficient during Solidification of Magnesium Alloys Using High Pressure Die Casting Process

Sharifi, Pouya; Jamali, Jamaloddin; Sadayappan, Kumar; Wood, Jeffrey

doi:10.1016/j.jmst.2016.09.004

Cited by 22 publications

(7 citation statements)

References 23 publications

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“…Except for that at the initial stage of solidification, R h is always smaller than 0.03, which suggests that the accuracy of IHTCM will become higher and higher as the solidification proceeds. For normal heat transfer at the interface between ingot and mould, there barely exists the sharp drop in interfacial heat transfer coefficient, [49][50][51] like the given interfacial heat transfer coefficient (h i = 2 000t − 0.5 ). Thus, the errors of ingot temperature obtained by FHCM is tiny, and the interfacial heat transfer coefficients obtained by IHTCM is seriously accurate.…”

Section: Model Validationmentioning

confidence: 99%

Quantitative Correlation between Interfacial Heat Transfer Coefficient and Pressure for 19Cr-14Mn-0.9N High Nitrogen Steel Cylindrical Ingot

Zhu

et al. 2020

ISIJ Int.

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Section: Model Validationmentioning

confidence: 99%

Quantitative Correlation between Interfacial Heat Transfer Coefficient and Pressure for 19Cr-14Mn-0.9N High Nitrogen Steel Cylindrical Ingot

Zhu

et al. 2020

ISIJ Int.

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“…parameter of a ¼ 1.054 nm. The incident beam direction is [1][2][3][4][5][6][7][8][9][10]. In Figure 8c, the diffraction spots have apparent fivefold symmetry, which means that the phase is an icosahedral quasi-crystalline phase.…”

Section: Effect Of Cooling Rate On the Dendrite Microstructurementioning

confidence: 99%

“…Moreover, the new characteristic microstructures have impacts on the plasticity, strength, creep resistance, and corrosion resistance of alloys. [5][6][7] In recent years, studies have been conducted on the microstructure of magnesium alloys under subrapid solidification conditions. The ZM61(Mg-6Zn-1Mn) alloy solidified at a cooling rate of 2.5 Â 10 2 C s À1 showed a significantly refined grain size and improved comprehensive mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Microstructure and Microsegregation in Subrapidly Solidified Mg–6Al–4Zn–1.2Sn Magnesium Alloy

Cui

Luo

et al. 2020

Adv Eng Mater

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The evolution of the microstructure and microsegregation in a new type of Mg–6Al–4Zn–1.2Sn (wt%) cast magnesium alloy solidified at cooling rates from 4.5 × 101 °C s−1 to 2.3 × 103 °C s−1 is investigated. The results indicate that the secondary dendrite arm spacing and the average grain sizes decrease from 14.3 to 2.9 μm and from 187 to 78 μm, respectively, as the cooling rate increases from 4.5 × 101 °C s−1 to 2.3 × 103 °C s−1. The relationship between the secondary dendrite arm spacing (λ2) and cooling rate (R) is fitted as λ2 = 69.7 × R−0.42. When the alloy solidifies in the range of cooling rates, a new quasi‐crystalline I phase is formed due to faster solidification. The microsegregation ratios of Al, Zn, and Sn elements decrease significantly with the increase in cooling rate. Compared with the specimen solidified at 4.5 × 101 °C s−1, the microsegregation ratios of Al, Zn, and Sn of that solidified at a cooling rate of 2.3 × 103 °C s−1 decrease by 37.4%, 45.7%, and 31.6%, respectively.

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“…In particular, the AE series magnesium alloys, which have already developed into an important type of magnesium alloys with high temperature strength and creep resistance [20][21][22] . However, current studies on AE series magnesium alloys mainly focused on their performance improvement, while less attention was paid to the characteristics of microstructure and defect bands in die castings [23,24] . In addition, systematical investigation on the distribution of multiple defect bands in the cross section of die castings, as well as the difference between them with various process parameters is still a relatively unexplored area.…”

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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Grain Size Distribution and Interfacial Heat Transfer Coefficient during Solidification of Magnesium Alloys Using High Pressure Die Casting Process

Cited by 22 publications

References 23 publications

Quantitative Correlation between Interfacial Heat Transfer Coefficient and Pressure for 19Cr-14Mn-0.9N High Nitrogen Steel Cylindrical Ingot

Quantitative Correlation between Interfacial Heat Transfer Coefficient and Pressure for 19Cr-14Mn-0.9N High Nitrogen Steel Cylindrical Ingot

Evolution of the Microstructure and Microsegregation in Subrapidly Solidified Mg–6Al–4Zn–1.2Sn Magnesium Alloy

Defect band formation in high pressure die casting AE44 magnesium alloy

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