Flow Behavior and Microstructure Evolution of Ti-46Al-6(Cr, Nb,Si,B) Alloy During Hot Compression
Flow behavior and microstructure evolution of the as-cast Ti-47. 5A1-6. 5(Cr,Nb, W,Si,B) (mole fraction, ％) alloy (G4 alloy) were studied through a Thermecmaster-Z simulator at 1050~125℃0 with the constant strain rate of 0. 001s-1～1. 0s-1 to a strain of 0. 6. True stress-strain curves and processing map were set up based on simulation datas. Microstructure evolution of the G4 alloy was invested by optical(OP) and transmission electron microscope (TEM). The stress-strain curves show that G4 alloy presents a hardening and softening characteristic at initial and subsequent stage of compression with the flow stress sensitive both to deformation temperature and strain rate. The processing map shows that G4 alloy can be well deformed at temperatures higher than 1150℃ with a lower than 0.1s-1 strain rate. Metallographic analysis results indicate that the deformation behavior of G4 alloy is attributed to work-hardening and dynamic recovery and recrystallization controlled by dislocation movement.
TiAl alloy flow behavior microstructure evolution dynamic recrystlization process map
Shi Puying Li Zhenxi Cao Chunxiao
Beijing Institute of Aeronautical Materials, Beijing 100095, China
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
1467-1470
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）