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The ordering reaction in the newly developed Ni-Cr-W-Ti alloy aged at 700°C has been investigated using atom probe tomography and transmission electron microscopy. The results reveal that the existence of titanium in the superalloy induces and stabilizes the DO22 superlattices, which cannot precipitate in the ternary Ni-Cr-W superalloy. The stoichiometry of the DO22 phase has been determined to be...
It is demonstrated for the first time that a nanoscale superlattice with a DO22 structure can precipitate in an Ni–Cr–W alloy by means of a simple ageing treatment at 700°C. The existence of tungsten in the superalloy stabilizes the DO22 superlattices, which are transient metastable phases in Ni–Cr–Mo alloy. Because of the fine, spherical and dispersed precipitates in the Ni–Cr–W matrix, the microhardness...
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