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Research Papers

Effect of the Matrix and Reinforcement Sizes on the Microstructure, the Physical and Mechanical Properties of Al-SiC Composites

[+] Author and Article Information
M. A. Salem

Higher Technological Institute,
10th of Ramadan City,
Sharqiya 44629, Egypt

I. G. El-Batanony

Faculty of Engineering,
Al-Azhar University,
Cairo 11765, Egypt

M. Ghanem

Faculty of Industrial Education,
Suez University,
Suez 43527, Egypt

Mohamed Ibrahim Abd ElAal

Mechanical Design and Production Department,
Faculty of Engineering,
Zagazig University,
Zagazig 44519, Egypt

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received July 7, 2016; final manuscript received September 27, 2016; published online October 27, 2016. Assoc. Editor: Vadim V. Silberschmidt.

J. Eng. Mater. Technol 139(1), 011007 (Oct 27, 2016) (7 pages) Paper No: MATS-16-1192; doi: 10.1115/1.4034959 History: Received July 07, 2016; Revised September 27, 2016

Different Al-SiC metal matrix composites (MMCs) with a different matrix, reinforcement sizes, and volume fractions were fabricated using ball milling (BM) and powder metallurgy (PM) techniques. Al and Al-SiC composites with different volume fractions were milled for 120 h. Then, the Al and Al-SiC composites were pressed under 125 MPa and finally sintered at 450 °C. Moreover, microsize and combination between micro and nano sizes Al-SiC samples were prepared by the same way. The effect of the Al matrix, SiC reinforcement sizes and the SiC volume fraction on the microstructure evolution, physical and mechanical properties of the produced composites was investigated. The BM and powder metallurgy techniques followed by sintering produce fully dense Al-SiC composite samples with different matrix and reinforcement sizes. The SiC particle size was observed to have a higher effect on the thermal conductivity, electrical resistivity, and microhardness of the produced composites than that of the SiC volume fraction. The decreasing of the Al and SiC particle sizes and increasing of the SiC volume fraction deteriorate the physical properties. On the other hand, the microhardness was enhanced with the decreasing of the Al, SiC particle sizes and the increasing of the SiC volume fraction.

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Figures

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Fig. 1

SEM photomicrographs of Al powder (a) as received and (b) after 120 h of milling

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Fig. 2

SEM photomicrographs of SiC powder (a) as received and (b) after 120 h of milling—any large particles come from agglomeration

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Fig. 3

(a) SEM photomicrographs, (b) EDX area analysis, and (c) EDX point of SiC particles in the case of Aln-15%SiCn sample in powder state after mixing for 2 h

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Fig. 4

OM photomicrographs of (a) Alm-10%SiCm and (b) Alm-15% SiCm samples after compacting and sintering

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Fig. 5

SEM photomicrograph of Alm-10%SiCm sample after compacting and sintering

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Fig. 6

SEM photomicrographs of (a) Aln-10%SiCn and (b) Aln-15% SiCn samples after compacting and sintering

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Fig. 7

EDX of (a) Aln-10%SiCn and (b) Aln-15%SiCn after compacting and sintering

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Fig. 8

The density variation with the SiC content for the different composites

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Fig. 9

The variation of the void% with the vol. % SiC of the different composites

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Fig. 10

The variation of the thermal conductivity with the vol. % SiC of the different composites

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Fig. 11

The variation of the electric resistivity with the vol. % SiC of the different composites

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Fig. 12

The variation of the microhardness with the vol. % SiC of the different composites

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