When solution treatment was carried out at 1 553 K, a rafting structure formed even above the dissolution temperature of the gamma' phase in a liquid metal cooling directionally solidified nickel-based superalloy. This abnormal coarsening behavior may be induced by the phase transformation stress due to the dissolution of non-uniform distribution of the gamma/gamma' eutectic. Electron backscatter diffraction and transmission electron microscopy were employed to analyze the stress.
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