An enhanced FEM model for particle size dependent flow strengthening and interface damage in particle reinforced metal matrix composites

Atomic-scale strengthening mechanism of dislocation-obstacle interaction in silicon carbide particle-reinforced copper matrix nanocomposites

“…More recently, using MD simulations and 3D discrete dislocation dynamics simulations, Lehtinen et al [26] studied the different kinds of precipitates interacting with edge dislocation in BCC Fe, and discussed the variety of the relevant pinning/depinning mechanisms during the dislocation bypassing precipitate. Although a large number of recent studies have been performed on the strengthening mechanism of the ductile metal particles in PRMMCs [10][11][12][13][14][15][16][17][18][19][25][26][27][28][29][30], the brittle SiC particles on the mechanical properties of Cu matrix have been reported hardly at nanoscale.…”

“…Over the past few years, some numerical investigations [10][11][12][13] have been done in this field. On the one hand, some experiments [14][15][16][17] and theoretical models [18,19] show that the strengthening behaviors of PRMMNCs are primarily attributed to the dislocation strengthening effect and the load-transfer effect. In addition, the thermal mismatch in PRMMNCs promotes the generation of dislocations, resulting in the increasing of dislocation density in the composites and enhancing the dislocation hardening effect [7].…”

Effects of particle shape and size distribution on particle size-dependent flow strengthening in metal matrix composites

“…They not only extended the theory to incorporate quench hardening, but also used the cohesive zone model to account for interfacial debonding; indeed, their results were in excellent agreement with experiments of [1]. Shao et al [14] also analyzed this model within the Taylorbased Nonlocal Theory (TNT) of plasticity [15] where the dislocation punched zone [16] was also de ned around the particle to account for quenching. While numerical results well predicted the particle size e ects, it was the incorporation of the cohesive zone model that improved the results in confrontation with experiments of [1].…”

Comparative analysis of different models of interphase boundaries in metal-ceramic composites

“…An additional increase in the density of GNDs in this shell can be caused by a deformationinduced plastic strain gradient during mechanical loading. "Thermally" induced GNDs lead to an increase in the value of yield stress y , while the geometrical mismatch induced GNDs cause an increase in the strain-hardening coefficient K [5,6]. The third approximation assumes the gradient of the mechanical properties in the interface shell when passing from the inclusion surface towards the unmodified matrix (normal to the inclusion surface at that point) [4].…”