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semi-solid-aluminum
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Microstructural investigation of semisolid aluminum a356 alloy prepared by the combination of electromagnetic stirring and gas induction
, Article 15th International conference on Semi-Solid Processing of Alloys and Composites, S2P 2018, 22 October 2018 through 24 October 2018 ; Volume 285 SSP , 2019 , Pages 290-295 ; 16629779 (ISSN); 9783035713732 (ISBN) ; Yekani, F ; Aashuri, H ; Sharif University of Technology
Trans Tech Publications Ltd
2019
Abstract
A three phase electromagnetic stirrer was used to agitate aluminum A356 slurry and a dry and oxygen free argon gas was introduced in to the slurry by a porous graphite core at a same time. The prepared semi-solid slurry was then transferred into a metallic mold and was compacted by a drop weight. Results demonstrated a favorable increase in shape factor, decrease in aspect ratio and average diameter size at different intensities of stirring. The intensity of stirring was changed by altering the current passed through the magnetic coil and also bubbling intensity via the porous graphite diffuser. Different time intervals for electromagnetic stirring and gas induction were applied. Agitating...
Wear wear properties of rheo-squeeze cast aluminum matrix reinforced with nano particulates
, Article Protection of Metals and Physical Chemistry of Surfaces ; Volume 52, Issue 3 , 2016 , Pages 486-491 ; 20702051 (ISSN) ; Heydari, F ; Tofigh, A. A ; Rahimipour, M. R ; Razavi, M ; Mazahery, A ; Davami, P ; Sharif University of Technology
Maik Nauka Publishing / Springer SBM
Abstract
There are many approaches to fabricate nanoparticles reinforced aluminum matrix composites. However, uniform distribution of nanoparticle within aluminum matrix remains a difficult challenge. In this study, a novel method is used by taking the advantages from squeeze casting of semi-solid aluminum slurry combined with electromagnetic field to refine the microstructure of the primary Al and eutectic Si phase, plus to obtain uniform distribution nano alumina particles in the aluminum matrix. It is noted that electromagnetic field plays an important role in the formation of non-dendritic primary α-Al particles and a great microstructure refinement occurs as a consequence of the pressure...