Fatigue properties of particle-reinforced metal-matrix composites

Effects of particle size on fatigue crack initiation and small crack growth in SiC particulate-reinforced aluminium alloy composites

“…On the contrary, in the composites reinforced with coarser particles, all cracks initiated at the interface between SiC particles and the matrix as shown in Fig. 3(b), (c) and (d), suggesting that the interface debonding between SiC particles and the matrix is a main feature, which may be attributed to not only the size but also the shape of particles [5,8]. The present composites have the aspect ratio of SiC particles of approximately 1.7 and particles tended to align to the extrusion direction, i.e.…”

“…Although a number of studies on fatigue of MMCs have been done [1][2][3][4][5][6][7][8][9][10][11][12], the fatigue behaviour has not been fully understood, because it depends on many variables such as the strength of matrix, and the type, size, shape, distribution and volume fraction of reinforcements. Of these variables, particle size is one of microstructural parameters influencing the fatigue behaviour.…”

The quasi-static and cyclic fatigue fracture behavior of 2014 aluminum alloy metal-matrix composites

“…The local plastic constraints are particularly important for the larger-sized particles and for particle clusters during composite fracture. [63] Examination of the fracture surfaces revealed damage to be highly localized at the Al 2 O 3 reinforcing phase through cracked particles and failure of the interfaces, with little evidence of void formation away from the cracked or fractured Al 2 O 3 particle. This suggests that the plastic strain became localized during the early stages of deformation.…”

Influence of precipitation hardening parameters on the fatigue strength of AA 6061-SiCp composite

“…Further, the successful usage of the above class of DRCs for various end applications depends on its ability to endure fatigue loads, which is governed by the microstructure of the matrix alloy after precipitation hardening process (Hochreiter et al, 1993). Study by Lu et al (1999) concluded that the failure mechanism upon dynamic deformation of Al-MMCs was mainly due to nucleation, growth and coalescence of micro voids in the aluminium matrix.…”