With TiB

2

particles added into ZL114 A aluminum alloy powder

TiB

2

/ZL114 A compound powders with different TiB

2

content of 1% and 2% were prepared by ball milling and TiB

2

/ZL114 A composites were fabricated by laser selective melting（SLM） technology. The results indicate that the density of SLM formed ZL114 A alloy specimen are enhanced from 98.2% to 99.1% by 1% TiB

2

particles with significantly pore reduction. The tensile strength and microhardness of the composites are increased from 315 MPa

109.2 HV to 366 MPa

118.6 HV

respectively

and the elongation is increased from 6.3% to 10.5%. After annealing of 320 ℃×2 h

the tensile strength and microhardness of specimen are reduced to 295 MPa and 84.3 HV

while the elongation reaches 19.8%. After 525 ℃×3 h+180 ℃×6 h solution and aging treatment

the tensile strength is decreased slightly to 331 MPa

while the elongation reaches 14.2%. The TiB

2

particles in the 2% TiB

2

specimen are agglomerated and grown

leading to a large number of pores and defects

where the relative density and mechanical properties of the specimens are significantly reduced.