Effect of Laser Melting Process on a Modified AA7075 Alloy with Ti-B-Zr Modifiers

Using the Al-Zn-Mg-Cu alloys for the laser melting processes is a challenge due to the formation of hot cracks and pores in the fusion zone. This challenge can be solved by refining the grains, which was achieved in this study. The investigated alloy was modified with 0.5Ti + 0.1B and various Zr concentrations. The microstructure and hardness were studied in the as-cast and pulsed laser melt states (PLM). In the as-cast state, the grains size...