Microstructure and Mechanical Properties of TiC-Reinforced Al–Mg–Sc–Zr Composites Additively Manufactured by Laser Direct Energy Deposition

In order to refine the microstructure and improve performance of direct energy deposited (DED) additively manufactured Al–Mg–Sc–Zr alloy, TiC-modified composites were prepared by DED effect TiC content on was studied. absence particle, alloy consisted fine grains with average size 8.36 μm, well-dispersed nano-Al3(Sc,Zr) particles inside Mg2Si phase along grain boundaries. With addition 1 wt% TiC, TiC/Al–Mg–Sc–Zr became finer apparently compared that without TiC; while further increase 3 wt%, coarser appearance a new kind needle-like (Ti,Zr)5Si3 phase. Also, decreased porosity DED. Simultaneously, after tensile strength increased from 283.25 MPa 344.98–361.51 MPa, elongation 3.61% 9.58–14.10%. The potential mechanism evolution improvement discussed. This research will provide insights into available metal matrix laser additive manufacturing (LAM).