Effect of Grain Refiners and/or Modifiers on the Microstructure and Mechanical Properties of Al-Si Alloy (LM6)

Prema, Satya; Chandrashekharaiah, T.M.; Begum, P. Farida

doi:10.4028/www.scientific.net/msf.969.794

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…The wettability of the base matrix plays a crucial role in enhancing the strength of the bond between the reinforcements and matrix. With the inherent wettability between LM6 matrix and SiC reinforcements not being sufficient, studies illustrated the addition of a master alloy to elevate the wettability of the base matrix [30]. Moreover, the master alloy dissolves much quicker even at lower temperatures, saving valuable energy and production time.…”

Section: Methodsmentioning

confidence: 99%

Fabrication and Characterization of SiC-reinforced Aluminium Matrix Composite for Brake Pad Applications

Chatterjee

Sen

Paul³

et al. 2023

Metals

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The wear debris from conventional brake pads is a growing source of environmental contamination that often leads to life-threatening diseases for human beings. Though the emerging organic brake pads show potential to serve as an eco-friendly alternative, their mechanical and tribological properties are not adequate to withstand the demands of high-wear resistance of a functioning braking system under regular use. Metal matrix composites have served as an optimal solution with minimal environmental pollution and appreciable physical properties. Owing to the popularity of aluminium metal matrix composites, the present study is based on the fabrication and characterization of SiC-reinforced LM6 alloy through stir casting methodologies for evaluating its worthiness in application as a brake pad material. Microstructural, compositional, and phase characterizations were executed through optical micrography, X-ray diffraction, and energy-dispersive X-ray spectroscopy analysis. Although mechanical properties were evaluated through surface hardness investigation, parallel thermal properties were estimated through thermal conductivity evaluation. Finally, the execution of tribological analysis and precise microstructural observations of wear track at ambient and elevated temperatures helped in establishing the datum that the fabricated metal matrix composite (MMC) is a reliable brake pad material alternative.

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Section: Methodsmentioning

confidence: 99%

Fabrication and Characterization of SiC-reinforced Aluminium Matrix Composite for Brake Pad Applications

Chatterjee

Sen

Paul³

et al. 2023

Metals

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“…The addition of Al-Ti or Al-Ti-B-based inoculants to Al-Si alloys is used industrially. However, industrial companies are not interested in the microstructure of inoculant alloys, only their chemical composition and their effect on the grain refinement of the Al-Si alloy [ 8 , 9 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. The primary task of the inoculants added to the Al-Si alloy is to refine the microstructure by heterogeneous nucleation and to control grain growth [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characteristics of Al-Ti-B Inoculation Wires and Their Addition to the AlSi7Mg0.3 Alloy

et al. 2022

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Commercially supplied inoculation wires have a guaranteed chemical composition but not the size and distribution of individual phases, which are very important for nucleation. Therefore, two commercial alloys used for the inoculation of Al-Si alloys (AlTi3B1 and AlTi5B1) are investigated in this paper. The emphasis is placed on their structural analysis and the size and distribution of individual intermetallic phases. Furthermore, the grain refinement effect will be tested by adding these alloys to the AlSi7Mg0.3 alloy and testing the optimal amount of added inoculation wires. The results showed that the size and distribution of the individual phases in AlTi3B1 and AlTi5B1 meet the requirements for the successful inoculation of aluminum alloys, the intermetallic phases based on the TiAl3 phase are fine enough, and there is no agglomeration that would reduce the number of nuclei. This assumption was confirmed by adding these inoculants to the AlSi7Mg0.3 alloy, and it was found that the most ideal amount of inoculants added is 0.01 wt % when the structure was refined by approximately 32%.

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“…The quality of casting can be improved by several treatment methods. The grain refinement and eutectic Si modification are widely used to improve their microstructure and mechanical properties of al-Si cast alloys [1][2][3][4][5][6]. normally, the addition of conventional master alloy such as the al-Ti, al-Ti-B or al-B and combinations between grain refiner and modifier alloy system such as al-Ti-B-Sr, al-Ti-C-Sr and al-B-Sr [7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Muangnoy

Eidhed

2021

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Fading mechanism on grain reFinement and modiFication with al-B-sr master alloys in an aluminium-silicon cast alloy a fading mechanism during casting of treated al-B-Sr master alloys in an aluminium-silicon cast alloy was investigated. Two different master alloys, the al-3%B-3%Sr and al-4%B-1%Sr were demonstrated for the efficiency test both grain refinement and modification microstructure. From experimental result, the addition of al-3%B-3%Sr master alloy led to a refined grain size and fully modified eutectic Si. however, smaller grain sizes were found with al-4%B-1%Sr master alloy addition while eutectic Si had coarser acicular morphology. The formation of high amounts of SrB 6 compound in the al-3%B-3%Sr master alloy resulted to increase of grain size and eutectic Si. in fading mechanism test when holding the melt for prolong time, the agglomeration of the SrB 6 and alSiSr compounds at the bottom of the casting specimen was important factors that decreased both grain refinement and modification efficiency. The stirring of the melt before pouring was found that the grain size and Si morphology were improved.

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Effect of Grain Refiners and/or Modifiers on the Microstructure and Mechanical Properties of Al-Si Alloy (LM6)

Cited by 11 publications

References 6 publications

Fabrication and Characterization of SiC-reinforced Aluminium Matrix Composite for Brake Pad Applications

Fabrication and Characterization of SiC-reinforced Aluminium Matrix Composite for Brake Pad Applications

Microstructural Characteristics of Al-Ti-B Inoculation Wires and Their Addition to the AlSi7Mg0.3 Alloy

Archives of Metallurgy and Materials

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