Investigation of Tensile and Hardness Properties in Al2024 + SiC + Seashell Hybrid Composite Material
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Abstract
Aluminium metal matrix hybrid composite (AMHC) materials reinforced with silicon carbide (SiC) particles and seashell particles are of great interest to applications involving high temperature and extreme wear requirements. This paper describes the fabrication of AMHCs using stir-casting method. The aluminium alloy 2024 (AA2024) matrix is reinforced with 3% by wt. of SiC and 6% by wt. of seashell particles (referred as AMHC1) as well as 6% by wt. of SiC and 3% by wt. of seashell particles (referred as AMHC2). The stir casted bars are then machined down to the required ASTM E-8 and ASTM E-10 standard for tensile strength and a Brinell hardness characterisation respectively. The test results have shown that the addition of SiC and seashell particles to AA2024 has improved both the tensile strength and Brinell hardness when compared to the base AA2024. Increasing the SiC content to the AMHC from 3% by wt. to 6% by wt. has in fact reduced the tensile strength and Brinell hardness when compared to AMHC1 samples. The elongation to failure has also shown similar trend in-line with the yield to ultimate failure due to the addition of SiC and seashell particles.
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