Effect of void size and Mg contents on plastic deformation behaviors of Al–Mg alloy with pre-existing void: Molecular dynamics study

Abstract

The plastic deformation properties of cylindrical pre-void Aluminum-Magnesium (Al-Mg) alloy under uniaxial tension are explored using molecular dynamics simulations with embedded atom method (EAM) potential. The factors of Mg content, void size, and temperature are considered. The results show that the void fraction decreases with increasing Mg in the plastic deformation, and it is almost independent of Mg content when Mg is beyond 5%. Both Mg contents and stacking faults around the void affect the void growth. These phenomena are explained by the dislocation density of the sample and stacking faults distribution around the void. The variation trends of yield stress caused by void size are in good agreement with Lubarda model. Moreover, temperature effects are explored, the yield stress and Young's modulus obviously decrease with temperature. Our results may enrich and facilitate the understanding of the plastic mechanism of Al-Mg with defects or other alloys.

Competition of systematically optimized deep neural networks for the estimation of tensile behavior of aluminum-magnesium alloy

“…Such perturbations in the lattice structure lead to a diminution in the alloy's stiffness. This pattern finds corroboration in the study by Wei et al [18], who documented a decline in the modulus of elasticity in Al-Mg alloys with heightened magnesium content, thereby validating the outcomes derived from the present study.…”

“…Kumar and Das [15] delineated the mechanical properties of Al-Mg alloy across varying Mg concentrations employing the MD paradigm, noting a decrement in mechanical properties with elevated Mg content. Pogorelko and Mayer [16], Samiri et al [17], and Wei et al [18] further contributed to understanding the influence of various factors such as strain rate, temperature, and Mg content on the alloy's mechanical properties. Lee et al [19] and Chabba and Dafir [20] also provided valuable insights into the effects of magnesium content on the alloy's tensile and compressive properties.…”

Layer thickness dependent plastic deformation mechanism in Ti/TiCu dual-phase nano-laminates

“…Molecular dynamics (MD) simulation provides an alternative method to experiments, which plays an important role in understanding the deformation mechanism in metallic materials. [35][36][37][38] Actually, the mechanical properties of the crystalline/amorphous nanolaminates have been investigated in the past few years using MD simulation. [39][40][41][42] Tran and Fang [39] reported that the plastic deformation zones increase as the thickness of each layer decreases in crystalline/amorphous Cu/CuTa nanolaminates.…”