Fracture behaviour of a SiC-particle-reinforced aluminium alloy at high temperature

Synthesis, Tensile Testing, and Microstructural Characterization of Nanometric SiC Particulate-Reinforced Al 7075 Matrix Composites

“…Previous investigations, as given in Table I, have so far reported mixed results with both increases and decreases in the strength of the Al 7xxx series alloys reinforced with either micrometric or nanometric scale ceramic particulates. [5][6][7][8][9][10][11][12][13][14][15][16] Reduced strength has been linked with a number of factors, including the embrittlement effect of the particulate, particulate size, particulate clustering, deceleration in the aging kinetics of the matrix, interfacial reaction between the reinforcement and matrix, porosity issue, and the nature of synthesis route adopted. [10,11,15,16] Some investigations have found [8,9] that nanometric scale reinforcements are better than micrometric scale ones because of their effectiveness in blocking the dislocation motions, and because of their small size, they are less prone to crack or damage during the composite's synthesis process.…”

Hot formability studies on 359/SiC/20p and their application in forging optimisation

“…Flow stress and ductility of A1-DMMCs are more affected by forming conditions than they are in unreinforced aluminium alloys [5][6][7][8][9][10][11][12][13]. At low temperatures and high strain rates, plastic flow behavior is controlled by the reinforcing phase which determines higher flow stresses and lower ductilities than the matrix ones [16].…”

“…Figure 4 shows the flow stress versus temperature curves, at different strain rates, for a strain of 0.4; flow stress decreases with increasing temperature and decreasing strain rate following the typical behavior of metals deformed in hot working conditions [5][6][7][8][9][10][11][12][13][22][23][24]. The ductility, measured by the equivalent strain to failure (ef), versus temperature, at constant strain rates, is shown in Figure 5; for a given temperature, ef increases with decreasing strain rate.…”

“…Hot formability studies have revealed that A1-DMMCs are more sensitive to processing variables, such as temperature and strain rate, than the unreinforced matrices [5][6][7][8][9][10][11][12][13]. This is due to the presence of the hard particles in the soft matrix that causes a plastic flow localisation at the particle-matrix interfaces.…”

Finite Element Wear Behavior Modeling of Al/Al<sub>2</sub>SiO<sub>5</sub>/C Chilled Hybrid Metal Matrix Composites (CHMMCs)

“…On a weight-adjusted basis, many Al-based metal matrix composites (MMCs) can outperform cast steel, Al, Mg and virtually any other reinforced metal or alloy in a wide variety of applications. Hence, it seems probable that such MMCs will replace conventional materials in many commercial and industrial applications in the near future [22][23][24][25].…”