Abstract
The method of thin-foil transmission electron microscopy was used to examine phase transformations in the β-phase, representing the main heat-resistant component, of β/γ eutectics of the Ni-Co-Cr-Al system (mass %: 0-15 Co, 14-20 Cr, 8.5-10.5 Al). The martensitic transformation β(B2)→L1 0 took place in all the alloys, except those with 20 mass % Cr, when they were quenched in water from 1200°C. It was found for the first time that high-rank superstructures A 2 B (Ni 2 Al) and A 5 B 3 (Ni 5 Al 3 ) could be formed in a complex-alloyed β solid solution. Phase transformations L1 0 →A 5 B 3 , L1 0 →14M, L1 0 →B2→A 2 B, and L1 0 →B2→A 5 B 3 were observed in the β-component of the eutectics when isothermal annealing temperature was increased from 250 to 600°C. At a temperature of 400 °C and higher those transformations were accompanied by the decomposition of the β solid solution and the appearance of dispersed α-Cr particles. Structural features of the aforementioned phase transformations in heat-resistant quaternary eutectics were considered.
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