Nowadays, constantly developing technologies make emerging innovations in the engineering field. Al-Si-based materials are the most popular matrices because of their lightweight, making them suitable for aerospace and automobile applications.
This research aims to establish the tensile strength and hardness of Al-Si alloy parts manufactured through the Direct Metal Laser Sintering (DMLS) additive manufacturing technique and the effect of certain process parameters, such as laser power, scanning speed, and hatching distance, on the mechanical properties of the resultant component. The Multi-Criteria Decision-Making (MCDM) PROMETHEE method also assesses the tailored mechanical properties for obtaining the best DMLS fabrication process parameters.
The better tensile strength of 192 MPa and hardness values of 112 Hv were obtained in the experimental study, depending on the laser speed, hatch distance and scanning rate. The experimental study also provides valuable information about the capability and feasibility of Al-Si alloys for different engineering uses. It is also observed that increased laser speed and hatching distance improve both hardness and tensile strength. The PROMETHEE Model M3, which achieved a net flow of 11.19 and zero entering flow, was favored as the best configuration for its mechanical performance.
The originality of this research work lies in its focused evaluation of Al-Si alloys manufactured through the DMLS technique, emphasizing the combined influence of process parameters – laser power, scanning speed and hatching distance – on mechanical properties like tensile strength and hardness. By integrating experimental analysis with the MCDM PROMETHEE method, the study offers a unique approach to optimizing DMLS process configurations. This innovative combination of experimental and decision-making techniques provides new insights into tailoring mechanical properties, enhancing the understanding of Al-Si alloys’ potential for advanced aerospace, automotive and engineering applications.
