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SEM images of the fracture surface of Ni 99.99 and Ni99.79 deformed at different temperatures: (a) Ni99.99 HPT@ −196 °C, (b) Ni99.99 HPT@ −196 °C, (c) Ni99.99 HPT@ 25 °C, (d) Ni99.99 HPT@ 25 °C, (e) Ni99.99 HPT@ 200 °C, (f) Ni99.99 HPT@ 200 °C, (g) Ni99.99 HPT@ 400 °C, (h) Ni99.99 HPT@ 400 °C.
