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- W4309773935 abstract "Of the various metal additive manufacturing methods, wire-arc directed energy deposition (DED) enables processing large components at relatively high deposition rates with low raw material costs and has the ability for in-situ alloying materials to achieve chemical gradients. Here, we investigate micro and mesostructure, and corresponding mechanical properties, of a compositionally-graded Al-Si alloy that has been processed using commercially available AlSi5 and AlSi12 feeding wires in a dual-wire arc DED system. Microstructure characterization shows a chemical gradient from about 6.5–9.5 wt% Si along the build direction that correlates with increasing hardness values ranging from ∼ 40 HV0.5 to ∼ 65 HV0.5 and increasing tensile strength in both orthogonal orientations. While sample ductility is affected by testing orientation, the micro and mesostructure impart negligible anisotropy to the fracture resistance. Both strength and failure characteristics are associated with a mismatch in local strain deformation capacity between the α-Al dendrites and the eutectic Al-Si regions that affect the melt pool boundaries and the interior of melt pools differently. As a result, anisotropic tensile ductility results are controlled by the initiation of failure at the melt pool boundaries while the constant fracture toughness values for different orientations are mainly controlled by decohesion of the two phases and subsequent crack bridging with crack extension." @default.
- W4309773935 created "2022-11-29" @default.
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- W4309773935 date "2022-12-01" @default.
- W4309773935 modified "2023-10-05" @default.
- W4309773935 title "Strength and fracture resistance of in-situ alloyed compositionally-graded Al-Si processed by dual-wire arc directed energy deposition" @default.
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- W4309773935 doi "https://doi.org/10.1016/j.addma.2022.103291" @default.
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