# Multi-Objective Optimization Study on Production of AlSi10 Mg Alloy by Laser Powder Bed Fusion
## 1 Introduction
With these parameters, 99.98% relative density was achieved. In addition, the mechanical properties of the optimized parts were found to be significantly superior to those of the non-optimized parts [9]. Nine groups of samples were produced from AlSi10 Mg powder with various combinations of laser power and scan speed using SLM technology by [PERSON] et al. The study included relative density, tensile test, XRD, LSCM, SEM, and EDS analyses to evaluate the effects of laser power and scan speed on the relative density, microstructure, and tensile properties of the AlSi10 Mg alloy produced by SLM. The results showed that increasing the laser power and decreasing the scan speed to a certain level increased the structural continuity of the samples and significantly reduced the porosity. It was found that in combinations with the same energy relative density, the increase in laser power increased the internal temperature of the liquid pool, causing the powder to melt more homogeneously, which improved the relative density and internal porosity. Specimens produced at 225 W/1625 mm/s parameters in particular showed a 3.6% higher relative density and 16.5% higher tensile strength compared to 135 W/975 mm/s parameters [10]. In a study by [PERSON] and [PERSON], a combination of full factorial experimentation and response surface methodology was developed in order to optimize both the relative density and tensile strength of the AlSi10 Mg alloy produced by SLM. The effects of laser power and scan speed on these properties were discussed in detail in the study. The obtained results revealed that there was not always a positive relationship between relative density and tensile strength and that laser power and scan speed had a strong interaction with these properties. It was determined that the developed mathematical models provided high compatibility and accuracy. The optimum production parameters were determined as 340 W laser power and 1870 mm/s scan speed, the experimental relative density obtained with these parameters was found to be 99.34%, and the tensile strength as 328.31 MPa [11]. In the study of [PERSON] and [PERSON], the importance of dimensional accuracy in the additive manufacturing of the AlSi10 Mg alloy was emphasized. In the study, the geometric tolerances of the parts produced with twelve different laser power and scan speed combinations were investigated. The results showed that the deviation values increased at high and low laser power/scan speed combinations, and the lowest deviations were obtained at a laser power of 250-310 W and a scan speed of 785-974 mm/s. Using the gray relational analysis method, the most suitable production parameters were determined as 290 W laser power and 911 mm/s scan speed. Theseparameters provide high dimensional accuracy [12]. In a study by [PERSON] et al., the effects of production parameters on surface roughness and geometric tolerances in the additive manufacturing of the AlSi10 Mg alloy were investigated. In the experiments carried out using the Taguchi L27 orthogonal array experimental design, it was determined that increasing the laser power positively affected surface roughness and diameter change, while increasing the hatch distance had negative effects on circularity and centrality. In addition, a negative effect of increasing the scan speed on centrality was determined. The most suitable parameter for surface roughness and diameter change was found to be A1B1C3, for circularity change A3B3C1, and for centrality A3B1C1. An ANOVA showed that the most effective parameters on surface roughness, diameter change, circularity change, and centrality were 53.22% laser power, 62.45% hatch distance, 37.23% scan speed, and 40.41% hatch distance, respectively. According to the gray relationship analysis (GRA) results, the most suitable production parameter was determined as A2B1C3 [13]. Studies in the literature show that adjustments and optimizations made in the production process can have a direct effect on the functionality and aesthetic properties of the final product.