Deformation behavior of high Nb containing TiAl based alloy in α + γ two phase field region. (15th January 2016)

• Record Type: Journal Article
• Authors: Zhang, S.Z.; Zhang, C.J.; Du, Z.X.; Hou, Z.P.; Lin, P.; Kong, F.T.; Chen, Y.Y.
• Is Part Of: Materials & design. Volume 90(2016)
• Page Start: 225
• Page End: 229
• Publication Date: 2016-01-15
• Subjects: Titanium aluminum -- Microstructure -- Deformation mechanism; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2015.10.080
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Hot deformation behavior of high Nb containing TiAl based alloy with a nominal composition of Ti–44Al–8Nb–0.2W–0.2B–0.1Y at 1225 °C and 1275 °C is investigated. The deformation mechanism of α phase is dynamic recovery at 1275 °C, whereas γ phase is mainly dynamic recrystallized. It is revealed that α phase is softer and easier to be deformed when the alloy is deformed at 1275 °C. The reasons of the different deformation behavior between 1225 °C and 1275 °C, as well as the different deformation behavior between α phase and γ phase are analyzed. A multistep deformation process at gradually lowered temperature is proposed to eliminate the adverse influence of remnant lamellar structure on mechanical properties. Graphical abstract: EBSD map of Ti–44Al–8Nb–0.2W–0.2B–Y alloy deformed at 1275 °C. Highlights: α lath plastic deformed and hardly dynamic recrystallized at 1275 °C. The deformation mechanism of γ phase is dynamic recrystallization. A multistep deformation process at gradually lowered temperature is proposed.