Grain Refinement of Liquid Metal by Cavitation Process: Modelling Haghayeghi, L. Nastac, “Grain Refinement of Liquid Metal by Cavitation Process: Modelling”, Metals and Materials International, Vol.19, 2013, PP.959-967. An investigation was carried out on the grain refinement of molten AA5754 Aluminum alloy through intensive shearing. The results show intensive shearing via cavitation decreases the…
The effect of processing parameters on Ultrasonic degassing Haghayeghi, P. Kapranos, “The effect of processing parameters on Ultrasonic degassing” , Materials letters, Vol.116, 2014, PP.399-401. The paper describes studies on the effect of high intensity ultrasonic treatment on degassing of AA7075.Different ultrasonic parameters, such as frequency, power, melt temperature and processing time were…
Solidification of Pb-Sn alloys under Ultrasonic Field Haghayeghi, P.Kapranos, “Solidification of Pb-Sn alloys under Ultrasonic Field”, Materials letters, Vol.126, 2014, PP.244-248. Grain size reduction and improved material homogeneity through ultrasonic treatment of a melt are well-established facts; however, the mechanisms responsible for cavitation aided grain refinement are still not well understood. For an…
Work Hardening of Al-1%Mg by Equal Channel Angular Pressing Haghayeghi, P. Kapranos, “Work Hardening of Al-1%Mg by Equal Channel Angular Pressing”, Materials Letters, Vol.129, 2014, PP.182-184. When Equal Channel Angular Pressing (ECAP)was performed on an Al–1 wt%Mg alloy, it was noticed that at ultrafine grain sizes (less than1 μm) the material did not…
Grain Refinement Efficiency by Shearing Above and Below the Liquidus Haghayeghi, P.Kapranos, “Grain Refinement Efficiency by Shearing Above and Below the Liquidus”, Solid state phenomena, Vol.217-218, 2015, PP.23-28. There is a debate whether grain refinement is more effective when shearing above or below the liquidus. In this work, examination of the microstructural evolution…
Grain refinement of AA7075 alloy under combined magnetic fields Haghayeghi, P.Kapranos, “Grain refinement of AA7075 alloy under combined magnetic fields”, Materials Letters, Vol.151, 2015, PP.38-40. Combining static and pulsed magnetic fields for their suitability to grain refine AA7075 alloy examined which produced more refined microstructure compared to the use of single pulsed magnetic…
Ultrasonic vibrations prior to high pressure die-casting of AA7075 Haghayeghi, A. Heydari, P. Kapranos, “Ultrasonic vibrations prior to high pressure die-casting of AA7075”, Vol.153, 2015, PP.175-178. The effects of introducing ultrasonic vibrations prior to high pressure die casting have been experimentally investigated. Results suggest reductions of up to 73% in grain size and…
Microstructural evolution of 5754 under merged fields Num-Exp Haghayeghi, E.Ezzatneshan, “Microstructural evolution of 5754 under merged fields: Num/Exp”, Materials Processing Technology”, Vol. 225, 2015, PP.103-109. The effect of combined electromagnetic–ultrasonic fields evaluated on grain refinement. Cavitation induced by the combination of technologies suggested as major mechanism for grain refinement. A numerical simulation performed…
Process Development and Grain Refinement Haghayeghi, E.J. Zoqui, “Process Development and Grain Refinement”, Journal of La Metallurgia Italiana, Vol.108, 2016, PP.149-152. The effect of Ultrasonic Treatment (UT) and Electro Magnetic Stirring (EMS) were assessed separately and in combination prior to high pressure die-casting of AA5754. Results suggested by utilization of UT the grain…
ECAP-An alternative route for producing AlSiCu in SSM processing T.W. Proni, L.V. Torres, R. Haghayeghi, E.J. Zoqui, “ECAP: An alternative route for producing AlSiCu in SSM processing“, Materials Characterization, Vol. 118, 2016, PP. 252–262. In thixoforming processes control of the solid-to-liquid transition and grain size of the mush metal is essential. If eutectic…