This work reports additive manufacturing of nickel-aluminum-bronze alloys by electron beam powder bed fusion (EB-PBF), with a relatively homogeneous microstructure at the micro- to meso-scale and exhibiting an exceptional combination of tensile strength and ductility — well surpassing that of conventionally wrought counterparts. The attainment of both high yield and ultimate tensile strength are attributed to collective effects of uniformly distributed precipitates, near-equi-axed grains, and a high fraction of high-angle grain boundaries. High tensile ductility originates from a sustainable work-hardening ability via dislocation-dislocation and dislocation-precipitate interactions, enhanced by moderate twinning, stacking faults, and back-stress hardening. Significantly, the EB-PBF alloys exhibit near-isotropic tensile properties in directions parallel and vertical to the build direction due to high-density precipitates enabled by equi-axed grains.

这项工作报告了通过电子束粉末床熔合（EB-PBF）进行的镍铝青铜合金的增材制造，在微观到中观尺度上具有相对均一的微观结构，并具有抗张强度和延展性的出色组合-远远超过常规锻造的同类产品。高屈服强度和极限抗拉强度的获得都归因于均匀分布的析出物，近等轴晶粒和高比例的高角度晶界的共同作用。高拉伸延展性源自位错-位错和位错-沉淀物相互作用的可持续工作硬化能力，并通过适度的孪晶，堆垛层错和背应力硬化得到增强。重要的是