Thermophysical properties of A201, A319, and A356 aluminium casting alloys

Overfelt, Ruel A.; Bakhtiyarov, Sayavur I.; Taylor, Robert M.

doi:10.1068/htjr052

Cited by 29 publications

(11 citation statements)

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“…Mills [20] recommends values from 23 to 27 mm·s −1 for LM25, and 24 to 26 mm·s −1 for LM4. A paper by Overfelt and Bakhtiyarov [13] reports data on liquid A319 and A356 that are slightly higher (26-30 mm·s −1 ) than the values of the papers mentioned above. Taylor et al [10] published data on wrought alloys (1100, 2024, 6061, and 7075) as viewgraphs, ranging between 28 and 35 mm·s −1 , which are in agreement with the values recommended by Mills [20].…”

Section: Discussioncontrasting

confidence: 54%

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Thermal Diffusivity of the Aluminum Alloy Al–17Si–4Cu (A390) in the Solid and Liquid States

Kaschnitz

Ebner

2007

Int J Thermophys

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The thermal diffusivity of the aluminum alloy Al-17Si-4Cu (A390) was measured in the temperature range from room temperature to 730 • C using the laser-flash technique. A commercial laser-flash system (Netzsch LFA 427) was used for the measurements. A short laser pulse of 300µs was applied to heat the bottom surface of a disk-shaped specimen, resulting in a timedependent temperature increase at the top surface. A correction for the laser pulse length as well as the surface radiation and convection was applied in order to evaluate the half time value of the temperature increase. The thermal diffusivity was calculated from the specimen thickness and the half time value. A sapphire crucible was used to contain the specimen in the mushy region and in the liquid state. As the laser is fired from below at the bottom surface of the specimen, the thickness of the melt has to be small to avoid significant buoyancy. The thermal diffusivity of the alloy above the eutectic temperature and in the liquid is drastically lower than in the solid state of the alloy.KEY WORDS: Aluminum alloy A390; Al-17Si-4Cu; high temperature; laserflash method; liquid metal; thermal diffusivity.

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Section: Discussioncontrasting

confidence: 54%

“…In recent years, properties of some common aluminum, magnesium, copper, and iron alloys have been measured by several research groups (e.g., Refs. [9][10][11][12][13][14][15][16]). However, there is still a lack of reliable thermophysical property data, especially for newly developed alloys and mold materials.…”

Section: Introductionmentioning

confidence: 99%

Thermal Diffusivity of the Aluminum Alloy Al–17Si–4Cu (A390) in the Solid and Liquid States

Kaschnitz

Ebner

2007

Int J Thermophys

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“…This assumption does not invoke any numerical inaccuracies for the simulations, since the analytic solution for temperature at a point is spatially independent of nearby points. The thermophysical properties of the Al-Ce-Mg alloys were approximated as being equivalent to A356 with the values being taken from Overfelt et al 44 at around (Table 2).…”

Section: Solidification Condition Calculationsmentioning

confidence: 99%

Microstructure and Properties of Additively Manufactured Al-Ce-Mg Alloys

Sisco

Plotkowski

Yang

et al. 2020

Preprint

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Additive manufacturing of aluminum alloys is largely dominated by a near-eutectic Al-Si compositions, which are highly weldable, but have mechanical properties that are not competitive with conventional wrought Al alloys. In addition, there is a need for new Al alloys with improved high temperature properties and thermal stability for applications in the automotive and aerospace fields. In this work, we considered laser powder bed fusion additive manufacturing of two alloys in the Al-Ce-Mg system, designed as near-eutectic (Al-11Ce-7Mg) and hyper-eutectic (Al-15Ce-9Mg) compositions with respect to the binary L→Al+Al11Ce eutectic reaction. The addition of magnesium is used to promote solid solution strengthening. A custom laser scan pattern was used to reduce the formation of keyhole porosity, which was caused by excessive vaporization due to the high vapor pressure of magnesium. The microstructure and tensile mechanical properties of the alloys were characterized in the as-fabricated condition and following hot isostatic pressing. The two alloys exhibit significant variations in solidification structure morphology. These variations in non-equilibrium solidification structure were rationalized using a combination of thermodynamic and thermal modeling. Both alloys showed higher yield strength than AM Al-10Si-Mg for temperatures up to 350°C and better strength retention at elevated temperatures than additively manufactured Scalmaloy.

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“…Data set II: all material properties are defined from room temperature up to 400 C (7) and then linearly extrapolated up to 1000 C. Data set III: the material properties are taken from Overfelt et al (8) except for Young's modulus (unpublished BAM measurement). Figure 4 shows the results of the simulations for the three different material data sets for a 1000 C fire.…”

Section: Influence Of Materials Propertiesmentioning

confidence: 99%