Stress-Strain Characteristics of Laser Powder Bed Fusion of AlSi10Mg Alloy: An Atomistic Analysis

Abstract:

This study presents an atomistic analysis of the stress-strain characteristics in the laser powder bed fusion (LPBF) process for the AlSi10Mg alloy. The stress-strain response of printed components is investigated by introducing defects through molecular dynamics simulation. The simulation box dimensions for tensile tests and crack propagation are 152.416 Å, 201.228 Å, and 42.49 Å along the X, Y, and Z directions. Periodic boundary conditions are applied along all sides. A constant strain rate of 10⁹ s⁻¹ is applied along the Y-direction at a temperature of 300 K. The simulation results reveal that the maximum stress occurs at the initial time step, followed by a gradual decline as stress decreases and strain increases, indicating plastic deformation through dislocation slip. Dislocation Analysis (DXA) shows that dislocations increase with increasing strain. These findings enhance the understanding of the material's deformation behaviour and provide insights for optimizing its properties through laser processing parameters.

• Periodical: Key Engineering Materials (Volume 1036)
• Pages: 3-10
• DOI: https://doi.org/10.4028/p-X9czOz
• Online since: December 2025
• Authors: Jyotirmoy Nandy, Seshadev Sahoo*
• Keywords: Additive Manufacturing, Crack Propagation, Metal Laser Sintering, Molecular Dynamics

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