## Materials and Methods
Porosity was characterized by measuring relative density using different sections whose images, twelve for each batch, were taken at _Olympus_ microscope (Olympus Corporation, Tokyo, Japan) and image correlation software _DHS_ (DHS Solution, Greifenstein, Germany) was used for quantification. These embedded specimens were prepared for microstructural analysis by etching with NaOH and HNO\({}_{3}\) and were analyzed in scanning electron microscope _Tescan Mira XMU_ (TESCAN, Brno, Czech Republic) by _EOS_. The microstructural features of the eutectic alloy were measured in terms of the dendritic width. To measure the influence of processing conditions focused on cooling rate, the resulting thermal stresses were measured on the test specimens shown in Figure 2d in the gauge length. The measurement of residual stresses was performed by diffraction method Sin\({}^{2}\Psi\) and CuK\(\alpha\)-beamand was processed afterward by intermediate Lorentz function. Quasistatic tensile tests were performed using the test specimen shown in Figure 2d as per ISO 6892-1:2009 at a deformation rate of 1 mm/min using _Instron 3369_ (Norwood, MA, USA) universal testing machine with a load cell of 50 kN. The deformation during the test was measured using a 10 mm  
Figure 3: (a) Setup for in-situ tensile tests in the X-ray CT chamber; and, (b) the miniature specimen used for these tests, dimensions in mm. Figure 2: Experimental strategy for manufacturing of test specimens: (a) chessboard scanning strategy; (b) orientation of each layer at 79\({}^{\circ}\); (c) exemplary lot of the as-built specimens from the selective laser melting (SLM) process; (d) test specimen for tensile and high cycle fatigue tests; and, (e) test specimen for very high cycle fatigue tests, dimensions in mm. gauge length extensometer. Quasistatic tensile tests were also performed inside an X-ray computed tomography, namely _Nikon XT H 160_ (Nikon, Tokyo, Japan), which is integrated with 160 kV/60 W micro-focus X-ray tube. In-situ test module _CT 50000-GCT-RT_ was integrated inside the CT chamber on the manipulator platform, as shown in Figure 3a. Displacement-controlled tests were performed at 1 mm/min, and the tests were interrupted at defined intermediate stages where the gauge length was scanned before continuing the test further. Scanning was performed at four stages, and a miniature specimen was developed, as shown in Figure 3b, to fit in the in-situ module. The scans were evaluated using the reconstruction of the scan data. These intermittent tensile tests were performed only on one batch, where batch C was selected due to its relatively more damage-tolerant behavior as compared to other configurations. A mixed strategy was employed for the characterization of fatigue behavior of the investigated configurations. It consisted of multiple amplitude tests accompanied by measurement of material behavior during fatigue loading, and constant amplitude tests at different frequencies of 20 Hz and 20 kHz employing servohydraulic and ultrasonic fatigue testing systems, respectively. Multiple amplitude tests were performed initially for all of the configurations to have a first indication of the material behavior at different stress loadings. It was carried out by continuously increasing fatigue load, a schematic of which is shown later in Figure 8 together with the corresponding results. Plastic deformation behavior was measured by 10 mm gauge length extensometer. Irreversible fatigue damage in terms of plastic strain amplitude was measured, and the corresponding stress range was considered to be critical for further constant amplitude tests, which gave a detailed description of material behavior and the influence of processing conditions. The corresponding part characteristics were analyzed together with their fatigue response to develop process-structure-property relationships. Load increase tests and HCF tests at 20 Hz were carried out at _Instron 8872_ servohydraulic fatigue testing system.