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In this study, single wire arc additive manufacturing (SWAAM) and multi wire arc additive manufacturing (MWAAM) were used to fabricate the TC11 alloy. Microstructure and mechanical properties of TC11 alloy were studied. The results showed that the microstructure of MWAAM TC11 alloy composed of α and β phase, and the proportion of β phase increased slightly than that of SWAAM TC11 sample. Compared with the SWAAM TC11 sample, the microhardness of MWAAM TC11 alloy sample increased from 382 to 407 HV, and average ultimate tensile strength of MWAAM TC11 alloy sample increased from 922.01 to 934.56 MPa. The results indicate that the addition of wires can significantly improve both manufacturing efficiency and mechanical properties of TC11 alloy components. [ABSTRACT FROM AUTHOR]

The microstructure, corrosion, and cavitation erosion behaviors of the thermo-mechanically affected zone (TMAZ) in a friction stir processed Ni-Al bronze were investigated. The TMAZ mainly contained elongated α, refined ?II, β', and a small portion of eutectoid microstructure α + κIII. In 3.5 wt% NaCl solution, both the corrosion and cavitation erosion resistance ranked in the order: the cast substrate < the TMAZ < the stirred zone (SZ). Compared with the cast substrate, the TMAZ suffered less severe corrosion as a result of the reduction of eutectoid microstructure, which was susceptible to corrosion, and it was less severely damaged under cavitation erosion because it possessed higher hardness and exhibited more plastic deformation behavior. The SZ was more corrosion and cavitation erosion resistant than the TMAZ because it had the most homogeneous microstructure. [ABSTRACT FROM AUTHOR]