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To study the precipitation mechanism of α-Cr phase in Inconel 718 alloy,the samples after long-time aging at 650 and 677°C were examined by microstructural observations and chemical phase analysis methods.Combining the thermodynamics and kinetics calculation results,α-Cr always precipitates in the vicinity of δ phase,because δ phase rejects Cr into the γ-matrix when growing.The selected area diffraction patterns confirm that the crystallographic relationships of α-Cr with δ phase are(010)δ//(1 10)α-Cr and [100]δ//[111]α-Cr.A graphic model is also presented to show the crystallographic relation between α-Cr and δ phases.
To study the precipitation mechanism of α-Cr phase in Inconel 718 alloy, the samples after long-time aging at 650 and 677 ° C were examined by microstructural observations and chemical phase analysis methods. Combining the thermodynamics and kinetics calculation results, α-Cr always precipitates in the vicinity of δ phase, because δ phase rejects Cr into the γ-matrix when growing. selected region diffraction patterns confirm that the crystallographic relationships of α-Cr with δ phase are (010) δ // (1 10) α-Cr and [100] δ // [111] α-Cr. A graphic model is also presented to show the crystallographic relation between α-Cr and δ phases.