Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7972543 | Materials Science and Engineering: A | 2018 | 14 Pages |
Abstract
The microstructure characteristics of GH4169 alloy aged with electric-pulse treatment (EPT) at 800â¯Â°C were investigated and tensile properties were examined at high temperature. The tensile test results indicate that the ultimate stress, yield stress and fracture elongation increase simultaneously in the alloy aged with EPT compared with that of normal aged alloy. The vacancy concentration of the alloy aged with EPT increases proved by positron annihilation spectrometer compared with that of normal aged alloy. Vacancy concentration increase leads to increasing of yield stress at the initial stage of tensile deformation. Farther, vacancy induces ultrafine nm-sized γâ²â² phase to precipitate during tensile deformation at high temperature, which is the key factor on strength and ductility improvement. Meanwhile, EPT induces parts of γâ²â² phase (precipitating during aged treatment) to precipitate around dislocation which impedes dislocation motion.
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Authors
Jinlan An, Lei Wang, Xiu Song, Yang Liu, Zeyu Gai, Xingzhong Cao,