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The temperature dependence of the  γ  –  γ′  lattice misfit (d) between precipitates and matrix in three modified CMSX4-type nickel-base superalloys was investigated. The effect of the so-called standard heat treatment and of the addition of elements like Nb, Ti and Re on d was also monitored. The misfit was measured by  in situ  high-resolution X-ray diffraction (up to 1375 K), and the microstructure was investigated by means of optical and transmission electron microscopy. It was found that with the addition of Nb the microstructure becomes more sensitive to thermal treatments, while the presence of Ti strongly influences the lattice misfit  δ . Re also influences the value of  δ , but in combination with other elements. A standard CMSX4 alloy shows relatively less influence of the thermal treatments on the misfit values and the microstructural properties. For all samples investigated, the misfit is negative at all temperatures.

Lattice misfit in CMSX4-like nickel-base superalloys and its temperature dependence