A novel crack-free Ti-modified Mo alloy designed for laser powder bed fusion

A novel crack-free Ti-modified Mo alloy with good mechanical properties was fabricated successfully by laser powder bed fusion (L-PBF). The micro-Ti particles dissolve homogeneously into the Mo matrix. The homogeneous mixture of Ti in Mo does not allow the formation of any new secondary phases. The presence of Ti increases the resistance to deformation within the grains and hence, eliminates the formation of hot-tearing cracks between Mo grains. The presence of high compressive properties (compressive yield strength (656 ± 9 MPa) and fracture strain (18.2 ± 1.9%)) in the L-PBF Tiμm/Mo alloy sample may be attributed to the presence of a high degree of geometrically necessary dislocations (GNDs). The doping of Ti in Mo not only helps in the successful fabrication of L-PBF Mo but also improves their mechanical properties, which paves the way for the fabrication of high-performance Mo-based alloys by L-PBF via innovative alloy design. •Nearly full dense Tiμm/Mo alloy without cracks were fabricated by Laser powder bed fusion (L-PBF).•The alloy display nearly homogeneous microstructures and a single Mo phase.•The presence of Ti can increase geometrically necessary dislocations leading to the improvement of mechanical properties.•The alloy exhibits a high compressive yield strength (656 ± 9 MPa) and a good fracture strain (18.2 ± 1.9%).