Microstructure evolution and hot deformation behavior of Cu–3Ti–0.1Zr alloy with ultra-high strength
(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
3. Key Laboratory of Non-ferrous Metal Materials Science and Engineering, Ministry of Education,
Changsha 410083, China)
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
3. Key Laboratory of Non-ferrous Metal Materials Science and Engineering, Ministry of Education,
Changsha 410083, China)
Abstract: The hot compression deformation behavior of Cu-3Ti-0.1Zr alloy with the ultra-high strength and good electrical conductivity was investigated on a Gleeble-3500 thermal-mechanical simulator at temperatures from 700 to 850 °C with the strain rates between 0.001 and 1 s-1. The results show that work hardening, dynamic recovery and dynamic recrystallization occur in the alloy during hot deformation. The hot compression constitutive equation at a true strain of 0.8 is constructed and the apparent activation energy of hot compression deformation Q is about 319.56 kJ/mol. The theoretic flow stress calculated by the constructed constitutive equation is consistent with the experimental result, and the hot processing maps are established based on the dynamic material model. The optimal hot deformation temperature range is between 775 and 850 °C and the strain rate range is between 0.001 and 0.01 s-1.
Key words: Cu-3Ti-0.1Zr alloy; hot deformation; constitutive equation; recrystallization; hot processing map