Enhanced strength and ductility in particulate-reinforced aluminum matrix composites fabricated by flake powder metallurgy

Influence of interfaces on the mechanical behavior of SiC particulate-reinforced Al–Zn–Mg–Cu composites

“…To explore the mechanisms that may be responsible for the evolution of the composites' strength and failure strain for different heat treatments, the yield strength of the composites, σ y , is decomposed and expressed as [7,10]: is almost a factor of 2 higher than the yield strength of monolithic 7A04 Al alloy fabricated and heat treated under nominally the same conditions as those used in this study (503 MPa) [33]. A similar discrepancy has previously been reported for 6xxx Al alloys [13,34], and is likely the result of strong dislocation pile-up at the indents.…”

“…Among the parameters that may affect the mechanical performance of these composites, such as the reinforcement particle size [5,6], distribution [7] and volume fraction [3,8], the properties at and in the vicinity of particle-matrix interfaces play a critical role [9,10].…”

Enhanced mechanical behavior and fabrication of silicon carbide particles covered by in-situ carbon nanotube reinforced 6061 aluminum matrix composites

“…However, the incorporation of hard ceramic particles into metal matrix often requires a compromise between strength and toughness. In order to obtain the optimal mechanical performance, many researches have been conducted to find out the effect of different factors on the mechanical behaviors of composites, such as the type of reinforced particle [3], particle sizes [4,5], particle distribution [6,7] and particle contents [8], etc. Among these factors, particle size plays a critical role in improving the ductility of MMCs, especially when the particle size is reduced from microscale to nanoscale [9].…”

“…However, some local clusters of SiCp are formed in 2.5SiCp/6061Al, as indicated with red arrow in theFig.5e. It is well known that the uniformity of reinforcement distribution is determined by the size of reinforcement particles, size of matrix particles, volume fraction of reinforcements and extrusion ratio in PM process[6,28,29]. Kai et al[30] built a face-centered cubic (f.c.c) model to find the relationship of these factors in determining the distribution of reinforcement particles and eventually gave the criteria of reinforcement uniform distribution: r , d m , f and  are the initial matrix particle size, the volume fraction of reinforcement and strain ratio in the deformation processing, respectively.…”

Microstructures and Properties of the Copper‐Coated SiCp Reinforced Al–Si Alloy Composites

“…SiC p reinforced Al–Si base composites, which belong to a new class of lightweight materials are promising because of their outstanding abrasion resistance, low thermal expansion coefficient, and low density . However, SiC particles easily agglomerate in the aluminum matrix, causing cracks or holes which reduce the mechanical performance . Also, the low wettability of the SiC particles with the aluminum matrix leads to a low relative density and a large number of micropores.…”