Microstructural evolution during superplastic deformation in large-grained iron aluminides
Superplastic behavior has been found in Fe{sub 3}Al and FeAl alloys with grain sizes of 100--600{micro}m. The large-grained Fe{sub 3}Al and FeAl alloys exhibit all deformation characteristics of conventional fine size superplastic alloys. However, superplastic behavior was found in large-grained iron aluminides without the usual pre-requisites for superplasticity of a fine grain size of large-grained iron aluminides decreased during superplastic deformation. Transmission electron microscopy (TEM) observations have shown that there were a great number of subgrain boundaries which formed a network and among which the proportion of low and high angle boundaries increased with increased strain. The observed superplastic phenomenon is explained by continuous recovery and recrystallization. During superplastic deformation, an unstable subgrain network forms and these subboundaries absorb gliding dislocations and transform into low and high angle grain boundaries. A dislocation glide and climb process accommodated by subboundary sliding, migration and rotation, allows the superplastic flow to proceed.
- Research Organization:
- Shanghai Jiao Tong Univ. (CN)
- Sponsoring Organization:
- National Natural Science Foundation of China (NNSFC)
- OSTI ID:
- 20001651
- Report Number(s):
- CONF-981104-; ISBN 1-55899-458-0; ISSN 1067-9995; TRN: IM0001%%88
- Resource Relation:
- Conference: High-Temperature Ordered Intermetallic Alloys VIII, Materials Research Society Symposium Proceedings, Boston, MA (US), 11/30/1998--12/03/1998; Other Information: PBD: 1999; Related Information: In: High-temperature ordered intermetallic alloys VIII. Materials Research Society symposium proceedings: Volume 552, by George, E.P.; Mills, M.J.; Yamaguchi, Masaharu [eds.], [600] pages.
- Country of Publication:
- United States
- Language:
- English
Similar Records
On deformation-induced continuous recrystallization in a superplastic Al-Li-Cu-Mg-Zr alloy
Dislocation model for continuous recrystallization during initial stage of superplastic deformation