Influence of stirring speed and stirring time on distribution of particles in cast metal matrix composite

Prabu, S. Balasivanandha; Karunamoorthy, L.; Kathiresan, S.; Mohan, B.

doi:10.1016/j.jmatprotec.2005.06.071

Cited by 488 publications

(169 citation statements)

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“…Therefore, optimal value of stirring time is essential. Prabu et al studied effect of stirring time on microstructure and hardness of Al/SiC composite has been investigated and suggested 10 min as optimal value of stirring to achieve better distribution of reinforcements and uniform value of hardness throughout the composite [17]. Apart from stirring time, the position of stirrer is important and discussed further.…”

Section: Stirring Timementioning

confidence: 99%

“…Whereas stirring time more than 10 min (t > 10 min) cause deformation of stainless stirrer at high temperature which lead to non-homogeneous distribution of particles. Stirrer time of 10 min (t = 10 min) shows uniform distribution of reinforcement particles without deformation of stirrer, thus 10 min is suggested as optimal value of stirring time [13,17]. Feed rate less than 0.8 g/s is very difficult to achieve and greater than 1.5 g/s results particle accumulation, hence the optimal rate suggested as 0.8-1.5 g/s to avoid the accumulation of reinforcements in the composite and achieve homogeneous dispersion of reinforcement particles throughout the composite [11,18,22].…”

Section: Optimal Valuesmentioning

confidence: 99%

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Fabrication of Aluminum Matrix Composites by Stir Casting Technique and Stirring Process Parameters Optimization

Sahu¹,

Sahu²

2018

Advanced Casting Technologies

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Aluminum matrix composites (AMCs) and hybrid aluminum matrix composites (HAMCs) becomes choice for automobile and aerospace industries due to its tunable mechanical properties such as very high strength to weight ratio, superior wear resistance, greater stiffness, better fatigue resistance, controlled co-efficient of thermal expansion and good stability at elevated temperature. Stir casting is an appropriate method for composite fabrication and widely used industrial fabrication of AMCs and HAMCs due to flexibility, cost-effectiveness and best suitable for mass production. Distribution of the reinforcement particles in the final prepared composite regulates the anticipated properties of AMCs and HAMCs. However, distribution of reinforcements is governed by stirring process parameters. The study of effect of stirring parameters in the particle distribution and optimal selection of these is still a challenge for the ever-growing industries and research. In this chapter accurate and precise attempts were taken to explore the effect of stirring parameters in stir casting process rigorously. Further, Optimal values of stirring parameters were suggested which may be helpful for the researchers for the development of AMCs and HAMCs. This chapter may also provide a better vision towards the selection of stirring parameters for industrial production of AMCs and HAMCs comprising superior mechanical properties.

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Section: Stirring Timementioning

confidence: 99%

Section: Optimal Valuesmentioning

confidence: 99%

Fabrication of Aluminum Matrix Composites by Stir Casting Technique and Stirring Process Parameters Optimization

Sahu¹,

Sahu²

2018

Advanced Casting Technologies

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“…Consequently, it increase the wt % of SiC particles produce the gas trapped in which it may result in the higher porosity [15]. Agglomeration the SiC tended to improvedin a lower speed and time [5]. The first stirring of borax / SiC particles then heated and the molten Al slurry were performed in the semi-solid state to prevent the relatively denser SiC particles from floating on the surface of the melt due to the high surface tension and the poor wetting between the particles and the melt [3,6].…”

Section: Microstructure and Sem Investigationmentioning

confidence: 99%

“…In this case, the use of borax additive in the combination of two-step stirring was to improve the wettability without pre-heating the SiC particulates and decrease level of porosity until 1,6% [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Compared production behavior of borax and unborax premixed SiC reinforcement Al7Si-Mg-TiB alloys composites with semi-solid stir casting method

Haryono¹,

Sulardjaka²,

Nugroho³

2016

AIP Conference Proceedings

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Abstract. The present study was aimed to investigate the effect of borax additive on physical and mechanical properties of Al7Si-Mg-TiB with the reinforcement of silicon carbide. In this case, the different weight percentage from the reinforcement of SiC (10, 15, and 20% wt), and the borax additive (ratio 1:4) were homogenously added into the matrix by employing the semi-solid stir casting method at the temperature of 590°C. Al7Si-Mg-TiB melted in an electric resistance furnace at 800°C for 25 minutes and the holding time of 5 minutes; SiC was stirred with borax inside the chamber and heated at the temperature of 250°C for 25 minutes. Then, it melted by lowing the temperature into 590°C. The SiC-borax mixture was added into the electric resistance furnace, and automatically stirred by the stirrer at a constant speed (500 rpm for 3 minutes) in the composite A17Si-Mg-TiB. It melted when heated at 750°C for 17minutes,then, casting was performed on the prepared mould. The characterizations of Al7Si-Mg-TiB-SiC/borax were porosity, hardness, and microstructure on the Al7Si-Mg-TiB-SiC/ borax. The porosity of AMC tended to increase along with the increaseof the wt% SiC (1.4%-3.6%); however, borax additive underwent a decrease in porosity (0.14%-1.3%). Further, hardness tended to improve along with the increase of wt% SiC. The unboraxmixture had 79,6 HRB up to 94 HRB. Whereas, the borax additive mixture had 105,8 HRB up to 121 HRB.

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“…It is concluded from the study that stirring speed has a significant effect on particle distribution. Moreover, Prabu et al, [7] also investigated the effects of stirring speed on uniform distribution of SiCp in Al alloy matrix. This investigation considered the effect on the hardness value and microstructure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Stirring Speed on Microstructure and Wear Morphology of SiCp-6061Al Composite

Adebisi

Maleque

Ndaliman

2016

IJEMM

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The aim of this study is to investigate the influence of stirring speed on stir casting synthesis of 15 wt% silicon carbide particle reinforced aluminium alloy (SiCp-6061 Al) composite. The composite samples were produced at different stirring speed of 300, 500 and 700 rpm. However, the processing temperature and time are maintained at 800 °C and 180 secs processing condition. Dry reciprocating wear test is conducted using a ball on disc wear tester at a constant operating condition of 50N load, 10Hz frequency for 30 mins on the samples. The influence of stirring speed on the microstructure and wear morphology is examined using scanning electron microscope (SEM). The result reveals that the stirring speed influenced the processing condition including the microstructure and wear topography. Composite processed at 500 rpm attained homogeneity of the SiCp phase as observed from the microstructure. The worn surface experiences a relatively smooth mild wear without formation of cracks, porosity and craters. However, at 300 rpm the composite experiences micro cracks with formation of abrasive grooves due to insufficient distribution of the SiCp phase. Moreover, at 700 rpm high speed vortex formation is observed due to vigorous stirring which entraps gases and develops into large porosity, cracks and deep craters. This study establishes that stirring speed has a significant effect on the processing condition as well as the wear morphology of SiCp-Al6061 composite developed using stir casting technique.Keywords: Stir casting, Stirring speed, Wear morphology, SiCp-6061Al composite, Microstructure 1 INTRODUCTION Silicon carbide particles reinforced aluminium alloy (SiCp-6061Al) composite is the most commonly used metal matrix composite due to its strength and stiffness, improved wear resistance and cost effective process technique [1]. These features makes them to emerge as an important category of materials that have potentials for structural applications in the automotive and aerospace industry. The processing of this attractive material plays a major role in determining the performance properties under operational condition [2,3]. Among the variety of processing technique, the stir casting is generally accepted and commercially viable in developing the aluminium silicon carbide composite [4]. Moreover, the properties of SiCp-6061Al composites produced by stir casting depend on process parameters such as stirring speed. For instance, the homogenous distribution of reinforcement particulate is mostly dependent on the stirring speed of the composite melt. Uniform distribution is desired in order to maximize the composite properties. In achieving these properties, the stirring speed is of utmost concern.Several casting defects are obviously related to the extent and method in which the stirring occurred. Studies [2,4] have shown that porosity formation is attributed to gas entrapment during vigorous stirring leading to air bubbles in the slurry either independently or as air envelopes the reinforced particles. Very...

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Influence of stirring speed and stirring time on distribution of particles in cast metal matrix composite

Cited by 488 publications

References 10 publications

Fabrication of Aluminum Matrix Composites by Stir Casting Technique and Stirring Process Parameters Optimization

Fabrication of Aluminum Matrix Composites by Stir Casting Technique and Stirring Process Parameters Optimization

Compared production behavior of borax and unborax premixed SiC reinforcement Al7Si-Mg-TiB alloys composites with semi-solid stir casting method

Influence of Stirring Speed on Microstructure and Wear Morphology of SiCp-6061Al Composite

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