Partitioning behavior and lattice misfit γ/γ′ phases in Ni-based superalloys with different Mo addit

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A low-density single crystal (LDS) alloy with the composition of high Mo content was designed.The extra 1.5 wt% Mo was added in the Alloy A with the composition of Ni-6.5Al-8.0Mo-2.4Cr-6.2Ta-4.9Co-1.5Re-(0.01-0.05)Y (wt%) to study the influence of Mo on the lattice parameter and partitioning behavior.Scanning electron microscope (SEM) with energy-dispersive spectrometer (EDS),transmission electron microscopy (TEM) and high-temperature X-ray diffraction (HT-XRD) were used to observe the microstructure,analyze the elemental content and measure the lattice parameter of the alloys.The natural lattice misfit was calculated by lattice constants which were measured by HT-XRD at the temperature from 25 to 1150 ℃,and the results showed that the lattice misfit would be more and more negative with temperature increasing.It was found that 1.5 wt% addition of Mo will increase the absolute value of the lattice misfit of γ/γ′phases and the volume fraction of γ′,and at the same time,influence the elemental distribution in γ and γ′ phases,especially Re and Cr.Re has a higher partitioning ratio (k) after the addition of Mo.
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