The microstructural evolution during superplastic deformation in FeAl intermetallic compound
- Shanghai Jiao Tong Univ. (China). Dept. of Materials Science
The intermetallic compound FeAl has received a great deal of attention during the past few years because of its excellent oxidation resistance, retention of good strength to intermediate temperatures and its low density compared with most iron or nickel-based alloys. Superplasticity has been discovered in some intermetallics with fine grain size, such as Ni{sub 3}Al and Ni{sub 3}Si, Ti{sub 3}Al and TiAl. Recently, some work on the phenomenon of superplasticity in Fe{sub 3}Al and FeAl-based alloys has been reported. A FeAl based-alloy with a grain size of above 350 {micro}m exhibited an elongation of more than 150% at 900 {approximately} 1,000 C in air. The maximum elongation of 208% was obtained at 1,000 C under a strain rate of 1.39 {times} 10{sup {minus}2}/s. The index of strain rate sensitivity, the m value, was in a range from 0.25 to 0.42(4). In this paper the dislocation features in an FeAl-based alloy after superplastic deformation, which have been investigated by transmission electron microscopy (TEM), are presented and the microstructural evolution during superplastic deformation is discussed.
- OSTI ID:
- 205232
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 34; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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