Abstract The effects of the grain refinement and eutectic Si modification on tensile properties by using Al-B-Sr master alloys in A356 cast alloy were investigated. Two different alloys, Al-4%B-1%Sr (4B1Sr) Al-3%B-3%Sr (3B3Sr), developed. In microstructure observation, consisted AlB 2 , SrB 6 AlSrF, KAlF 4 Al Sr compounds. It should be noted that α-Al phase also exists two alloy. result showed ...

The present study aims to investigate the microstructure and mechanical properties of A356 aluminum metal matrix composite reinforced with Y2O3 particles. is synthesized by adding 1 2 vol.% reinforcement via stir casting assisted ultrasonic treatment (UT). Microstructural contemplates show improvement in dispersion nano particles a decrease porosity level due ultrasound aided synthesis. UT refi...

The mechanical behaviour of the oxide film that develops at metal-air interface molten A356 aluminum alloy is investigated in relation to oxidation level. Based on two previous papers - first one focusing chemical aspects process liquid surface aluminum, second its characterization, present paper aims reconciling these approaches usually considered separately literature and proposes a stand-alo...

The present article investigates the microstructure and mechanical properties of A356 matrix composite reinforced with TiB 2 particles synthesized by salt metal reaction as-cast T6 state. Microscopic observations prepared composites reveal that in-situ grown are characterized regular shapes nearly uniform distributed in matrix. A clear interface between was observed. detailed analysis state sho...

Mutations at the cytokinin biosynthesis locus (tmr) of Agrobacterium tumefaciens usually result in strains that induce tumors exhibiting the rooty phenotype associated with high auxin-to-cytokinin ratios. However, tobacco (Nicotiana tabacum cv Havana 425) leaf disc explants responded to tmr- mutant strain A356 by producing rapidly growing, unorganized tumors, indicating that these lines can gro...

It was recently shown that silicon particles in heat-treated Al–Si casting alloys can contain flaws such as surface pinholes and grooves, which cause varying degrees of reduction in the in situ particle fracture strength and hence influence the mechanical properties of this class of alloys. In this work, we show that the formation of one class of such strength-limiting flaws in solidified and c...

A method is presented to use a dimensionless form of the well-known Niyama criterion to directly predict the amount of shrinkage porosity that forms during solidification of metal alloy castings. The main advancement offered by this method is that it avoids the need to know the threshold Niyama value below which shrinkage porosity forms; such threshold values are generally unknown and alloy dep...

Aluminium metal matrix composites (AMMCs) are now gaining their usage in aerospace and automotive industries. Because of their inherent nature, difficult to machine, they find very little applications in other sectors. Even non traditional processes like Laser Jet Machining and Electro Discharge Machining result in significant sub surface damage to the work. In this paper, an attempt is made to...