Characterization of a laser-fabricated hypereutectic Al–Sc alloy bar

Precipitation Reactions in Age-Hardenable Alloys During Laser Additive Manufacturing

“…phases different from the matrix phase). Since they form by precipitation phase transformations, they are called precipitates, and the materials featuring them, precipitation-strengthened alloys, 1 Examples are most Al alloys, [2][3][4] many Ni-based alloys [5][6][7] and some steels. [8][9][10][11] During conventional processing, these materials undergo two subsequent heat treatments.…”

Fusion‐Based Additive Manufacturing for Processing Aluminum Alloys: State‐of‐the‐Art and Challenges

“…Wang et al report on the successful fabrication of another 7xxx Al alloy by LBM in spite of significant losses of Zn and Mg through evaporation. Another form of alloy modification uses Sc that is known as a very potent grain refiner and that may also be responsible for a strong precipitation hardening by Al 3 Sc particles . An Al–2Sc alloy has been fabricated by wire‐feed EBM with promising results in an early study by Tomus et al More recently, Al–Mg (5xxx series) alloys modified with Sc additions, and particularly the new Al–Mg–Sc–Zr alloy known as scalmalloy ® , have attracted a lot of attention for processing by LBM …”

“…Thermal transfers during LC are dominated by convection and radiation, which are less efficient than conduction through the solid part and through the powder‐bed during LBM . As a consequence, heat often tends to accumulate in LC parts over the whole duration of the fabrication, resulting not only in generally coarser microstructures (compare Figure with Figure ), but also in large scale microstructural heterogeneities over the whole height of the build …”

Investigation on the Microstructure of Direct Laser Additive Manufactured Ti6Al4V Alloy

“…In this method, the shaped part is produced using a CAD file to move the nozzle in the XY-plane and the powder feed in three angles to Z-direction to add successive layers. Recently, a lot of studies have been done on the direct laser deposition which showed the significant effect of the laser parameters such as laser powder, scanning speed and duration time, etc [3][4][5][6][7][8] . Kruth et al 3 studied the processing window, including the selection of appropriate scan patterns, for a mixture of different types of metal powder particles.…”

“…Nowadays, there are several reports published regarding additive manufacturing of metals using powder, e.g. those from the Monash University 5 , University of Birmingham [6][7][8] , Northwestern Polytechnical University 9 , Beihang University 10 and NASA Langley Research Center 11 , etc. From these previously reported papers, it could be seen that these studies are mainly concentrated with the equipment, the laser software and the relationship between single laser parameter and the properties of materials.…”