In this work, crack-free samples with a relative density of 99.5 ± 0.1% were produced from a gas-atomized Al–Cu–Ag–Mg–Ti–TiB₂ powder via laser powder-bed fusion. The homogeneous equiaxed microstructure without preferred grain orientation shows the α-Al grains’ mean size to be 0.64 μm ± 0.26 μm TiB₂ particles with sizes of several tens of nm up to 1.5 μm were observed in the as-built component. Small TiB₂ particles of up to approx. 200 nm are located within the α-Al grains, which show a semi-coherent interface to the α-Al phase. Larger TiB₂ particles of up to 1.5 μm accumulate in the liquid between the growing α-Al grains during solidification and inhibit grain growth. Al₂Cu phase is precipitated at the α-Al grain boundaries. Coarse Al₂Cu precipitates, which are slightly enriched with silver and magnesium, are also observed within the grains preferentially precipitated on small pores and TiB₂ particles. The novel fine-grained microstructure results in the as-built state in a tensile strength of 401 ± 2 MPa and total elongation at fracture of 17.7 ± 0.8%.

在这项工作中，通过激光粉末床熔融从气雾化的Al–Cu–Ag–Mg–Ti–TiB ₂粉末中生产了相对密度为99.5±0.1％的无裂纹样品。没有优选晶粒取向的均匀等轴显微组织表明，在铸态组件中观察到α-Al晶粒的平均尺寸为0.64μm±0.26μmTiB ₂颗粒，其尺寸在数十nm至1.5μm之间。TiB ₂小颗粒，最大约 200 nm位于α-Al晶粒内，这表示与α-Al相的半相干界面。凝固过程中，在生长的α-Al晶粒之间的液体中会积聚最大1.5μm的较大TiB ₂颗粒，并抑制晶粒生长。铝₂Cu相在α-Al晶界处析出。在优先沉积在小孔和TiB ₂颗粒上的晶粒内也观察到粗略的Al ₂ Cu沉淀，其中略微富含银和镁。新型的细晶粒微观结构在形成状态下的拉伸强度为401±2 MPa，断裂时的总伸长率为17.7±0.8％。