Influence of SiC reinforcement on precipitation and hardening of a metal matrix composite

Precipitation hardening characteristics of Al–Si–Fe/SiC particulate composites

“…The age-hardening behavior of the SiCp/Al-Si-Fe composites are similar to 5SiCp/Al-Si-Mg as reported by Cottu et al [5], i.e. hardness continuously increases to maximum value during ageing and them decreases later due to overageing.…”

“…5 and 6). The addition of SiCp reinforcement to the aluminium alloy metal-matrix (Al-Si-Fe) raises the dislocation density at the particle-matrix interfaces [5,6]. This is due to the differences in coefficient of thermal expansion (CTE) between the hard and brittle reinforcing particles and the soft and ductile metal-matrix.…”

“…Cottu et al [5] showed that the hardening kinetics of A1-Cu-Mg alloy/10 wt% SiC fiber composite was enhanced by the presence of the reinforcement during heat-treatment. They explained this by the plastic deformation induced by the heattreatment due to the coefficient of thermal expansion (CTE) mismatch between matrix and reinforcement, as well as the highest dislocation density in the composite that supplied precipitation sites.…”

Aluminum Alloys for Al/SiC Composites

“…The composite reached its peak hardness in shorter time compared with the unreinforced alloy on solution treatment for 2 and 3 h, but reached it in longer time on solution heat treatment for 1 h (Mosuavi & Seyed, 2010). Using the same alloy type, 2124, Thomas and King studied the formation of phases during precipitation by differential scanning calorimetry (DSC) (Thomas & King, 1994 (Cottu et. al., 1992).…”

L effet des niveaux de refroidissement (temperature de du moule) et des traitements thermiques sur les proprietes mecaniques et sur la microstructure des deux alliages composites Al-Si-Mg/SiC/10p

“…The presence of SiC-particulates or fibres in a ductile matrix significantly alter the response to aging treatment, and an understanding of this response is essential to a rigorous development of composite strengthening theories [62].…”