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SEM fracture surface view after testing the toughness of WM created by the electrode No.1.2: (a) (t = + 20°C), ductile fracture with tiny pits containing deposited particles; (b) (t = −40 °C), mixed-mode fracture, which is predominantly transcrystalline; (c) (t = −60 °C), transcrystalline brittle fracture with the presence of microvoids in the middle of WM.
