Mechanical response and damage evolution of bio-inspired B4C-reinforced 2024Al composites subjected to quasi-static and dynamic loadings

A Review of Dynamic Mechanical Behavior and the Constitutive Models of Aluminum Matrix Composites

“…Due to the constraint effect of the particles on dislocations, the strain rate hardening effect of the composite material is significantly higher than that of the matrix. Wang et al [43,44] manufactured 2024Al/20-50vol.%B 4 C composites with a lamellar-interpenetrated structure, and studied their quasi-static and dynamic properties at strain rates from 0.001 to 3000 s −1 . As shown in the Figure 5 [43], before the strain rate increased to 3000 s −1 , the compressive strength of the composites increased with the strain rate, demonstrating strain rate hardening.…”

“…Wang et al [43,44] manufactured 2024Al/20-50vol.%B 4 C composites with a lamellar-interpenetrated structure, and studied their quasi-static and dynamic properties at strain rates from 0.001 to 3000 s −1 . As shown in the Figure 5 [43], before the strain rate increased to 3000 s −1 , the compressive strength of the composites increased with the strain rate, demonstrating strain rate hardening. Additionally, owing to the formation of a rigid network structure in composites with high B 4 C content, the strength of the material also increased with the increase in reinforcements.…”

“…However, when the volume fraction of SiC increases to 50%, the material's yield strength shows a positive correlation with strain rate, exhibiting significant strain rate sensitivity. Wang et al [43] studied the dynamic compression performance of B 4 C/Al composite materials with four volume fractions (20%, 30%, 40%, 50%). Research indicated that, as the content of B 4 C increases in composites, the strain rate sensitivity (SRS) of the material becomes more pronounced, especially when the content of B 4 C exceeds 40%.…”

“…However, when strain or strain rate is further increased, some materials may undergo strain softening, where the flow stress of the material gradually decreases with increasing strain, exhibiting a distinct difference from the dynamic stress-strain curve of aluminum alloys. Existing studies indicate that damage to the reinforcement and interfacial debonding during dynamic loading can lead to the strain softening of AMMCs [43,44]. Additionally, the softening of the aluminum matrix at high strain rates or temperatures, as well as the formation of adiabatic shear bands, can counteract the work-hardening effect, reducing the flow stress level of the composite material and causing strain softening [46].…”

“…Therefore, when the temperature rises, the softening of the material is more significant, leading to a sharp decrease in strength. In addition, Wang et al [43] investigated the quasi-static and dynamic properties of 20-50 vol.%B 4 C/2024Al composites at various strain rates (10 −3 ~3 × 10 3 s −1 ). The results indicate that, with increasing strain and strain rate, the dislocation density in the Al matrix increases, providing the driving force for DRV and DRX within the alloy.…”