Physics of Functional Materials

Fredriksson, Hasse; Åkerlind, Ulla

doi:10.1002/9780470725368

Cited by 24 publications

(22 citation statements)

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“…7 It should be noted that longer time of contact between the melt and the downsprue as well as extra insulation results in the mould being heated through, as can be deduced using Einstein relation to estimate the diffusion length. 23 The results are in agreement with a previous work. 24 In general the cavity located at the 12 o'clock position in the bottom-gated set-up was filled to a greater extent than the cavity in the 6 o'clock position, as can been seen Figure 5a.…”

Section: Resultssupporting

confidence: 93%

Effects of Process Related Variations on Fillablity Simulation of Thin-Walled IN718 Structures

et al. 2017

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Simulation tools have improved significantly and are now capable of accurately predicting mould filling behavior. The quality of prediction is highly dependent on material properties and set-up of boundary conditions for the simulation. In this work material properties were measured and casting conditions were analyzed to accurately replicate the casting process in simulation. The sensitivity of the predictions to minor process variations commonly found in foundries was evaluated by comparing simulation and cast samples. The observed discrepancies between simulation and cast samples were evaluated and discussed in terms of their dependency on process variations. It was concluded that the simulation set-up was capable of reasonable predictions and could replicate the asymmetry of the filling however did not accurately predict the absolute value of the unfilled area. It was discovered that asymmetric flow due to variations in the orientation of the casting mould during filling could have greater influence on the predictions than the actual variation in fill time. The quality of simulation is dependent on equipment and techniques used in the foundry as well as the metallurgical model to simulate the process.

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Section: Resultssupporting

confidence: 93%

Effects of Process Related Variations on Fillablity Simulation of Thin-Walled IN718 Structures

et al. 2017

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“…Density ρ at room temperature TRT was determined based on the Archimedes principle and the density at elevated temperatures was obtained from Eq. 1 [17].…”

Section: Thermo-physical Property Measurementsmentioning

confidence: 99%

Effect of Material Inhomogeneity on Thermal Performance of a Rheocast Aluminum Heatsink for Electronics Cooling

Payandeh

Belov

Jarfors

et al. 2016

J. of Materi Eng and Perform

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The relation between microstructural inhomogeneity and thermal conductivity of a rheocast component manufactured from two different aluminum alloys was investigated. The formation of two different primary α-Al particles was observed and related to multistage solidification process during slurry preparation and die cavity filling process. The microstructural inhomogeneity of the component was quantified as the fraction of α1-Al particles in the primary Al phase. A high fraction of coarse solute-lean α1-Al particles in the primary Al phase caused a higher thermal conductivity of the component in the near-to-gate region. A Variation in thermal conductivity through the rheocast component of 10% was discovered.The effect of an inhomogeneous temperature-dependent thermal conductivity on the thermal performance of a large rheocast heatsink for electronics cooling in an operation environment was studied by means of simulation. Design guidelines were developed to account for the thermal performance of heatsinks with inhomogeneous thermal conductivity, as caused by the rheocasting process. Under the modelling assumptions, the simulation results showed over 2.5% improvement in heatsink thermal resistance when the higher conductivity near-to-gate region was located at the top of the heatsink. Assuming homogeneous thermo-physical properties in a rheocast heatsink may lead to greater than 3.5% error in the estimation of maximum thermal resistance of the heatsink. The variation in thermal conductivity within a large rheocast heatsink was found to be important for obtaining of a robust component design.

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“…He found that most crystals were faceted. One can see that the crystals are bounded by (0001), ð1010Þ and ð1011Þ planes (pages 21-23 in Chapter 1 in [1]). One can see that the crystals are bounded by (0001), ð1010Þ and ð1011Þ planes (pages 21-23 in Chapter 1 in [1]).…”

Section: Crystal Morphologiesmentioning

confidence: 99%

“…This is shown schematically in Figure 5.4 where the growth rate is faster in the [110] direction than in the [010] and [100] directions (page 21 in Chapter 1 in [1]). This means that the growth rate of the crystal varies with the crystallographic direction.…”

Section: Crystal Morphologiesmentioning

confidence: 99%