Journal
ADDITIVE MANUFACTURING
Volume 38, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.addma.2020.101751
Keywords
Electron beam powder bed fusion; Copper-based alloys; High strength; High ductility; Isotropic properties
Funding
- National Basic Research Program of China (973 Program) [2014CB046705]
- National Natural Science Foundation of China (NSFC) [51721092, 51805183, 51875227, 51475190]
- Key Grant Project of Science and Technology Innovation Program of Hubei Province of China [2017AAA001]
- Fundamental Research Funds for the Central Universities [2020kfyXJJS0]
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This study reports the additive manufacturing of nickel-aluminum-bronze alloys using electron beam powder bed fusion technology, achieving a relatively homogeneous microstructure and exceptional mechanical properties, including high strength and ductility.
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.
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