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The SEM micrographs at different temperatures of: (a–c) T = 350 °C; (d–f) T = 450 °C; and (g–i) T = 500 °C. Here, the micrographs of (b,c), (e,f) and (h,i) are the high-magnification analysis results of microstructure in the white box region of (a), (d) and (g), respectively.
