Abstract
The phase equilibria in the nickel-phosphorus (up to 35% P) and nickel-phosphorus-carbon systems in the area of nickel-rich alloys were investigated by methods of differential thermal, metallographic, and x-ray diffraction analyses. The formation of the phosphides Ni3P, Ni9P2, Ni12P5, Ni2P, and Ni5P4, was confirmed. The melting points of the phases, the eutectics, and the peritectics were determined more accurately and the temperatures of the polymorphic transformations in Ni5P2 and Ni12P5 were determined for the first time. A non-variant four-phase equilibrium at 860°C was observed in the ternary system. It was established that the addition of phosphorus to alloys of nickel with carbon reduces the temperature of the start of melting from 1318 to 860°C.
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