Amorphous aluminium- silicon (AlSi) alloys possess exceptional potential for sustaining plastic deformation without sharp fracture, making them promising candidates for high- performance engineering applications. This study aims to evaluate the influence pf varying silicon compositions (0%,5%,10%,15%, and 20%) on the mechanical properties of amorphous AlSi using molecular dynamics (MD) simulations. The initial face- centered cubic (FCC) crystalline models were heated to 2300 K and subsequently quenched to 300 K to obtain the amorphous phase. Tensile and compressive tests were simulated in LAMMPS undet the NVT ensemble with uniaxial deformation, while structural changes were visualized using OVITO. The result indicate that the Al85si15 composition provides optimal mechanical performance, achieving a maximum stress of 1,03 GPa in both tension and compression, along with the highest elastic modulus of 31,78 GPa (tensile) and 20,55 GPa (compressive). Moderate silicion addition strengthens interatomic bonding, whereas excessive Si content (20%) reduces performance due to structural instability. The deformation mechanism in the amorphous structure is dominated by local atomic rearrangements and shear band formation, contrasting with the systematic slip observed in crystalline structures. These findings provide valuable insights for optimizing amorphous alloy compositions in automotive, aerospace, and electronis applications.

Keywords: Amorphous AlSi, molecular dynamics, plastic deformation, LAMMPS simulation, OVITO