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Gießtechnik, Erstarrung
Dokumenten-Nummer: 57790
02 Publikationssprache: Englisch
Li, J. H.; Schumacher, P.
Effect of Y addition and cooling rate on refinement of eutectic Si in Al-5 wt-%Si alloys
Einfluss von Yttrium und der Abkühlungsgeschwindigkeit auf die Kornfeinung des eutektischen Siliciums in der
Legierung Al-5 Gew.-%Si
A series of Al-5 wt-%Si alloys with or without 200 ppm Y addition have been produced using conventional casting and
melt spinning respectively. The effects of Y addition and cooling rates on the refinement of eutectic Si have been
investigated using thermal analysis, differential scanning calorimetry and multiscale microstructure characterisation
techniques. In the case of conventional casting, the addition of up to 200 ppm Y was found to cause no modification
effect. The eutectic Si presented a plate-like structure rather than a fibrous morphology. No significant Si twinning was
observed. In the case of melt spinning, a higher cooling rate caused a much finer eutectic Si and Si twinning. The
addition of 200 ppm Y promoted heavier multiply Si twinning. After a continuous cooling from 873 to 673 K, an Al2SiY
phase was observed beside or within the Si particle. The refinement mechanism was also discussed.
Montanuniversität Leoben, AT; Österreichisches Gießerei-Institut (ÖGI), Leoben, AT
International Journal of Cast Metals Research
Erscheinungsjahr 2012
Heftnummer 6
S. S.347-357 (11 Seiten, 12 Bilder, 4 Tabellen, 30 Quellen)
Gießtechnik, Erstarrung
Dokumenten-Nummer: 57893
Zeitschriftenaufsatz
Li, Yanlei; Li, Yuandong; Li, Chu; Wu, Huihui
Publikationssprache: Englisch
Microstructure characteristics and solidification behavior of wrought aluminum alloy 2024
rheo-diecast with self-inoculation method
Gefügeausbildung und Erstarrungsverhalten von der im Rheo-Diecast-Verfahren mit Selbstimpfung hergestellten
Aluminium-Knetlegierung 2024
One important problem in casting wrought aluminum alloys is the high tendency to the formation of hot tears in the
solidification process. By using semi-solid metal (SSM) processing, the hot tearing tendency of alloys can be minimized
during casting. In the present research, the semi-solid slurry of wrought aluminum alloy 2024 was firstly prepared with a
novel self-inoculation method (SIM), and then the microstructure characteristics of the semi-solid slurry and the
rheo-diecastings cast with the semi-solid slurry were investigated. The results indicate that finer and more uniform
globular primary cr-AI particles can be obtained when the semi-solid slurry are isothermally held for a short period
within the semi-solid temperature range, and the primary CT-AI particles without entrapped liquid are uniformly fine,
globular grains In the rheo-diecastings The holding temperature and time affect the solid fraction, pprticle size, and
shape factor. After the semi-solid slurry is held at 625 deg C for 3 min and 5 min, the optimal values for the average
equivalent diameter are 70.80 micro m and 74.15 micro m, and for the shape factor are 1.32 and 1.42, respectively.
The solidification process of the rheo-diecastings is composed of the following two distinct stages: primary solidification
process and secondary solidification process. The secondary solidification process consists further of the following
three stages: (1) direct growth of secondary primary (cr2) phase from the surface of the primary a-AI phase particles
without re-nucleation, (2) independent nucleation and growth of a3 phase from the residual liquid, and (3) eutectic
reaction at the end.
Lanzhou University of Technology, CN
China Foundry
Erscheinungsjahr 2012
Heftnummer 4
S. S.328-336 (9 Seiten, 13 Bilder, 18 Quellen)
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