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Compressive stress-strain curves and evolution of hardness: (a) Stress-strain curves of samples SPS-ed at 900 °C and heat-treated-perpendicular direction. (b) Stress-strain curves of samples SPS-ed at 900 °C and heat-treated-longitudinal direction. Stress-strain curves of samples SPS-ed at 1000 °C, 1100 °C, and heat-treated-perpendicular (c) and longitudinal (d) direction. (e) Evolution of hardness during heat treatment of sample SPS-ed at 900 °C.
