SiCp are one of the most used types of
reinforcement to reinforce Aluminum (Al) alloy in order to produce composite
materials that have the desired properties. SiC enhances the tensile strength,
hardness, density and wear resistance of Al alloy (Murty S. V. S. N. et al.,
2003; Iqbal A. A.; 2016).
T. Ozben (2008) found that the increase
in the ratio of SiCp in Al-SiCp composites enhance the tensile strength,
hardness and density whereas the impact toughness decreased. In addition, particles
clustering, particle cracking and weak matrix-reinforcement bonding are the
factors affecting the impact behavior of SiC (Ozden S. et al., 2007; Iqbal A.
P. Zhang and L. Fuguo (2010) studied the
impact of reinforcement particles agglomeration on the flow behavior of SiCp
reinforced AMMCs. They concluded that the particle agglomeration has greater
effects on the mechanical response of the matrix during the tensile deformation
compared to the elastic response. They also revealed that the agglomeration
region has higher number of fractured particles compared to the particle random
distribution region (Zhang P., & Fuguo L., 2010; Iqbal A. A.; 2016).
K. L. Meena et al. (2013) have studied
the impact of SiCp volume in the Al-SiCp composites. The study used 5%, 10%,
15% and 20% by weight of SiC to investigate tensile strength, hardness, density
and impact strength. In addition the study found that all of these properties
increase with the increase in the weight percentage of SiCp.
Furthermore, Srinivasa K. et al. (2014) fabricate
Al LM6-SiCp composites using stir casting method. They fabricated Al LM-6-SiCp
with varying composition of 0%, 5%, 10% and 15% by weight of SiC. They
concluded that as the ratio of SiC content increase the hardness of Al LM6-SiCp
composite increases. However the wear resistance decreases gradually with the
increase of SiC content.
addition, N. S. Kalyankar et al. (2016) did a study that was focusing on the
change in the mechanical properties of Al LM25-SiCp composites and fabricated
by stir casting method. Al LM25 matrix material was reinforced with 10%, 15%
and 20% by weight of SiC. They found that wear resistance of the fabricated
composite increased with increasing SiC weight percentage and hardness
decreased with SiC content. Also they concluded that the tensile strength,
yield strength and percentage of elongation increased with the increase in the
weight percentage of SiC.
Different studies have been conducted to
study and understand the fatigue and fracture behavior of Al-SiCp composites.
A. A. Iqbal et al. found in two separate studies on the hybrid AMMCs that the
particle-matrix interface is the place where the fatigue damage initiates. They
also concluded that the fatigue damage propagates by the particle fracture and
interface de-bonding (Iqbal A. A. et al.,
2003; Iqbal A. A. et al., 2004).
G.G. Hosamani et al. (2016) investigated
the wear characteristics, microstructure and the mechanical properties of SiC
reinforced AMMCs. They fabricated AMMCs with 0, 3, and 7 weight % of SiC
content by stir casting process. They experimentally concluded that the
addition of SiC reinforcements in Al matrix increased wear resistance, tensile
strength and compressive strength. The maximum weight percentage of SiC
reinforcement at which the fabricated AMMCs showed maximum wear resistance,
tensile strength and compressive strength was 7%. They also found from the
microstructure analysis that clustering and non-homogeneous distribution of SiC
particles. They attributed this to the improper time given for contact between
SiC particle and Al matrix and the poor wetting of SiC particle in molten Al.