Rate-dependent behavior of hierarchical Al matrix composites

An enhanced continuum model for size-dependent strengthening and failure of particle-reinforced composites

“…For example, Dai et al [12] showed experimentally and analytically that the additional strengthening due to GNDs may accentuate adiabatic shear localization at high loading rates. Rate-dependent failure response varying from catastrophic shear cracking at quasi-static strain rates ($10 À3 s À1 ) to gradual softening due to microcracking and shear softening at high strain rates (>10 3 s À1 ) is also observed in nano-micro ("trimodal") particulate composites [8].…”

“…This may be especially true for advanced MMCs that exhibit super-high strengths even at relatively low particle volume fractions (e.g. [8]). Also, the GNDs are likely to be distributed non-uniformly owing to non-spherical inclusion shapes.…”

High strain rate deformation and resultant damage mechanisms in ultrafine-grained aluminum matrix composites

“…after annealing, whereas the strain-to-failure in high strain rate (i.e., dynamic) compression (10 3 -10 4 s −1 ) is nearly 30 pct. [11]. The reported mechanisms identified to account for this observed increase in strain-to-failure were rapid nucleation and multiplication of cracks followed by shear localization [11,12].…”

Strengthening mechanisms in an Al–Mg alloy

“…These bimodal materials aim to optimize the strength and ductility of the material. To achieve even higher strengths, bimodal aluminum materials are further reinforced with ceramic particles, resulting in complex metal matrix composites [9][10][11]. To truly understand these complex, multi-scaled microstructures, it is important to have a foundational understanding of the coarse-grained basis materials.…”