Fig. 1 True stress-true strain curves of the Cu-Cr-Zr alloy deformed at different strain rates: a \(\dot{\varepsilon }\) = 0.001 s-1, b \(\dot{\varepsilon }\) = 0.1 s-1, c \(\dot{\varepsilon }\) = 1 s-1, d \(\dot{\varepsilon }\) = 10 s-1

Fig. 2 Relationship between the peak stress and deformation temperature under different strain rates

Fig. 3 Relationships between \(\ln \dot{\varepsilon }\) and ln σ a, \(\ln \dot{\varepsilon }\) and σ b According to Eq. (8), the plots of \(\ln \dot{\varepsilon } - \ln [\sinh (\alpha \sigma )]\,{\text{and}}\,\ln [\sinh (\alpha \sigma )] - 1/T\) at different temperatures are shown in Fig. 4a, b, respectively. Consequently, the values of n and S can be calculated by means of linear regression analysis, and then the value of Q can be determined as Q = RnS = 392.48 kJ/mol.

Fig. 4 Relationship between \(\ln [\sinh (\alpha \sigma )]\) and \(\ln \dot{\varepsilon }\) a, \(\ln [\sinh (\alpha \sigma )]\) and 1000/T b

Fig. 5 Zener-Hollomon parameter, Z, as a function of the flow stress

Fig. 6 Strain hardening rate variation of the Cu-Cr-Zr alloy under different deformation temperature at the true strain of 0.001 s-1

Fig. 7 Processing maps for the Cu-Cr-Zr alloy deformed at the true strain of 0.3 a, 0.4 b, 0.5 c

Fig. 8 Optical micrographs of the microstructure of the hot compressed specimens deformed at different temperatures and strain rates: a 650 °C, 0.1 s-1; b 700 °C, 0.1 s-1; c 750 °C, 0.001 s-1; d 800 °C, 0.01 s-1; e 800 °C, 0.001 s-1; f 850 °C, 0.001 s-1

Fig. 9 SEM images showing cracks in the compressed specimen at different temperatures and strain rates: a 650 °C, 10 s-1; b 700 °C, 10 s-1

Fig. 10 TEM micrographs of the Cu-Cr-Zr alloy deformed at different temperatures and strain rates: a 650 °C and 10 s-1; b 700 °C and 0.1 s-1; c 700 °C and 0.001 s-1; d 800 °C and 0.001 s-1; e selected-area diffraction pattern from d