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Microstructural Evolution during Superplastic Deformation in Large-grained Iron Aluminides

Published online by Cambridge University Press:  10 February 2011

Dongliang Lin  and
Yi Liu
Dongliang Lin
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University Shanghai 200030, P. R. China
Yi Liu
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University Shanghai 200030, P. R. China
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Abstract

Superplastic behavior has been found in Fe3A1 and FeAl alloys with grain sizes of 100–600μm. The large-grained Fe3Al 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 and grain boundary sliding. The metallographic examinations have shown that the average 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

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK8.21.1
Copyright
Copyright © Materials Research Society 1999

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References

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