Al-AlNi In Situ Composite Formation by Wire-Feed Electron-Beam Additive Manufacturing.

The regularities of microstructure formation in samples of multiphase composites obtained by additive electron beam manufacturing on the basis of aluminum alloy ER4043 and nickel superalloy Udimet-500 have been studied. The results of the structure study show that a multicomponent structure is formed in the samples with the presence of CrC carbides, solid solutions based on aluminum -Al or silicon -Si, eutectics along the boundaries of dendrites, intermetallic phases AlNi, AlNi, Al5CoNi, and AlCo, as well as carbides of complex composition AlCCr, AlSiC, of a different morphology. The formation of a number of intermetallic phases present in local areas of the samples was also distinguished.