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Characterization of hot deformation behavior of as-forged TiAl alloy.
- Source :
-
Intermetallics . Dec2014, Vol. 55, p66-72. 7p. - Publication Year :
- 2014
-
Abstract
- The deformation behavior of as-forged Ti–43Al–9V–Y alloy was investigated by hot compression tests in the temperature range of 1100–1225 °C and strain rate range of 0.01–0.5 s −1 . The results show that the alloy exhibits negative temperature sensitivity and positive strain rate sensitivity. The stress exponent ( n = 3.02) and the apparent activation energy ( Q = 342.27 kJ/mol) of the present alloy are lower than that of previous reported TiAl alloys, which suggests that the as-forged Ti–43Al–9V–Y alloy exhibits better deformability at low temperatures and high strain rates. A processing map for hot working was developed on the basis of a dynamic material model. The deformation mechanisms were analyzed by the processing map. The optimum processing condition at the strain of 0.6 is 1180–1210 °C/0.01–0.05 s −1 . A crack-free Ti–43Al–9V–Y sheet was prepared by hot rolling at these optimized parameters. EBSD results show that dynamic recrystallization is more likely to occur for γ phase. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09669795
- Volume :
- 55
- Database :
- Academic Search Index
- Journal :
- Intermetallics
- Publication Type :
- Academic Journal
- Accession number :
- 98145259
- Full Text :
- https://doi.org/10.1016/j.intermet.2014.07.010