A study of the microstructure and the mechanical properties of an Al Si Ni alloy produced via selective laser melting

Laser Powder Bed Fusion of a High Strength Al-Si-Zn-Mg-Cu Alloy

“…The highest mechanical properties, σ y = 350.6 MPa and UTS = 415.1 MPa, were achieved by ageing the samples at 160 • C for 6 h. The hardness values and the tensile strengths of the 50% 7075 alloy measured in different conditions are compared in Table 5 with literature data of alloys with similar compositions. It is evident that the hardness of 50% 7075 in the as-built state is slightly lower with respect to the AlSi10Mg one [12]. Notwithstanding this, the 50% 7075 is characterized by higher tensile properties and in particular higher yield strength than the AlSi10Mg.…”

“…The rotational speed of the system was fixed at 60 rpm. This mixing method was used because in previous works it was demonstrated not to damage the particles shape [15,16]. The flow behavior of the commercial and mixed powders was evaluated by the tap density measurements in order to assess the effect of different particles morphology on the powder flowability.…”

“…However, clarification on the Si distribution within the LPBF samples was not carried out. The distribution of Si in these samples might be very critical; previous studies have demonstrated in fact that the use of pure metallic particles for the in-situ formation of an alloy may cause a non-homogeneous composition within the samples [12,13]. Finally, Martin et al obtained crack free LPBF 7075 parts by adding hydrogen stabilized Zr nanoparticles to the 7075 powder [14].…”

Effect of Process and Post-Process Conditions on the Mechanical Properties of an A357 Alloy Produced via Laser Powder Bed Fusion

“…LPBF is one of the most used AM processes, owing to its ability to produce functional near net shape metallic parts with enhanced mechanical properties [3]. Furthermore, LPBF is very attractive thanks to its extremely high cooling rates that can reach 10 6 Ks −1 [4], that make it possible, as recently reported in some studies, to obtain metastable structures and supersaturated solid solutions [5][6][7].…”

Corrosion resistance in chloride solution of the AlSi10Mg alloy obtained by means of LPBF

“…It eliminates the swarf typical of traditional subtractive machining and permits to obtain new complex forms. 2 The manufacture of aluminium components by this technique requires a careful laser scanning strategy to avoid the formation of oxide at the interface between adjacent traces and to limit the porosity. 3 The LPBF machine should be equipped with an inert atmosphere room, being the reactive nature of the metal.…”