Abstract
The early evolution of the δ phase and coarse γ´´ phase in aged Inconel 718 alloy was studied by transmission electron microscope. The results show that the needle-like δ phase first nucleates at the grain boundary and then grows into the grain interior. It is found that two δ phases with different orientations were combined to form one δ phase as the ageing time extended to 4 h. In addition, the δ phase maintains a good orientation relationship with the matrix during ageing. The coarse γ´´ phase nucleates at the dislocation, and the increase in size leads to the loss of coherence with the matrix, in which the strengthening effect is not obvious.
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