Cooling Curve Analysis of A356 Alloy by Conventional Casting and the Effect of Stirring

The present investigation attempted to explore the effect of stirring during solidification of Aluminum A356 alloy, mainly focusing on the change from dendrite to globular structure. For this purpose samples of A356 alloy were melted in the electrical resistance furnace and cooling curves were recorded for each level agitation. The experimental curves were numerically processed by calculating first and second derivatives. From these were determined temperatures and times of start nucleation of alpha solid and eutectic reaction.

Finite Element Analysis of Damping Properties of High Strength Aluminum A356 Alloy Composite

Aluminum composites are in reality notably used as a piece of various programs due to their tremendous load to quality homes. Many studies works had been finished to ponder and improve the mechanical houses of aluminum mixes. The formation of alloying segments anticipate a fundamental component in choosing the properties of a mix. The eventual results of numerical systems have been recognized via and massive as they eagerly facilitate with the check comes to fruition. In the present evaluation a numerical examination contraption i.E., restrained section examination (FEA) is used. The paintings presented in this paper is away for the examination of effect of vibration traits of aluminum blends of various sport plans. The displaying and evaluation is finished the usage of ANSYS programming. A secluded assessment is carried out to recognize the vibration direct i.E., trademark repeat and mode shapes, of the cloth considered. The mode shapes and fashionable Recurrence receive a essential part within the framework Of dynamic machines. The consonant evaluation has been made to choose repeat traits. The examination software scrutinizes the information from the records archive shapes the information and makes the yield document containing the nodal migrations and nodal stretch estimations of various nerves. From the examination it's miles assumed that as the copper and silicon content material within the amalgams grows winding decreases then again. ANSYS comes about insist the smallest Modulus twisting and a definitive tractable strengthincaseofthe380 mixes of 380 additions with the extension in copper and silicon content. Subsequently Al 380 amalgams show high-quality fine with least vibration.

Microstructural Investigation of Semisolid Aluminum A356 Alloy Prepared by the Combination of Electromagnetic Stirring and Gas Induction

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 the slurry for 90 Sec. separately by electromagnetic stirrer and GISS method, gave better results in terms of shape factor, decrease in average diameter of the globules and aspect ratio.

Characterization of Globular Microstructure in NMS Processed Aluminum A356 Alloy: The Role of Casting Size

Semi-solid processing (SSP) technology, due to its ability to provide near-net-shape components with properties far exceeding those of other casting technologies is considered as an alternative for forgings and investment castings. Conventional semi-solid forming, involving the use of heated billets, melt stirring or using cooling slopes require many processing steps and supplementary equipments. This article describes Narrow Melt Stream (NMS), as an alternative process for semi-solid processing of aluminum alloys that eliminates capital cost expenditures, reduces the number of steps required, and hence reduces the costs of making components with a globular structure. However, the applicability of this technique in producing globular structures in the large molds has not been explored. In the present study the results of a systematic investigation on the effects of mold size on the size and morphology of the globular structures formed by NMS processing of Al 356 alloy is reported. For this purpose, five different series of molds were employed. Each series consisted of three molds with identical volumes but different casting moduluses. By using these molds, the effects of casting modulus at constant casting size as well as the effect of casting volume on the size and shape factor of the globular structures in aluminum A356 samples prepared by NMS technique is reported.

Aluminum A356 Reinforcement by Carbide Nanoparticles

The main issue of the study is aluminum A356 alloy modification by TiC nanoparticles process. Nanoparticles of TiC were especially mechanochemically activated to remove the oxide layer on the particle surface in order to prevent its floating on the molten metal surface. Experimental results indicate that after T6 heat treatment the tensile strength of the modified alloy increased by 6.5%, yield strength increased by 9% and the elongation increased by 22%. A high resolution electron microscopy study shows that dislocation of the modified alloy concentrates near the grain boundary during the crystallization process, and these grain boundaries act as obstacles to dislocation motion. Based on these results, it was found that grain-size aluminum strengthening mechanism occurs in the nanoparticle carbide reinforcement process.