中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 10 October 2025 |
（1. Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China;
2. Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, China）
Abstract:Compressive mechanical behavior and microstructure evolution of Ti-5.7Al-2.9Nb-1.8Fe-1.6Mo- 1.5V-1Zr alloy under extreme conditions were systematically investigated. The results show that strain rate and temperature have a significant influence on the mechanical behavior and microstructure. The alloy exhibits a positive strain rate sensitivity and negative temperature sensitivity under all temperature and strain rate conditions. The hot- rolled alloy is composed of a bimodal structure including an equiaxed primary αp phase and a transformed β phase. After compression deformation, the bimodal deformed structural features highly rely on the temperature and strain rate. At low temperature and room temperature, the volume fraction and size of αp phase decrease with increasing temperature and strain rate. At high temperature, the volume fraction of the α phase is inversely correlated with temperature. A modified Johnson-Cook constitutive model is established, and the predicted results coincide well with the experimental results.
Key words: titanium alloy; extreme condition; mechanical behavior; microstructure; modified Johnson-Cook constitutive model
