The influence of microstructure on superplastic behaviours of {gamma}-TiAl alloys
In this work, superplastic behaviors in Ti-33Al-3Cr-0.5Mo (wt%) {gamma}-TiAl alloys with two different initial microstructures of near gamma (NG) and duplex (DM) structure were investigated with respect to the effect of testing temperatures and strain rates. At 1,050 C and a strain rate of 8 x 10{sup {minus}5} s{sup {minus}1}, a maximum elongation of 570% was observed for NG-TiAl and a maximum elongation of 467% for DM-TiAl. The relations of flow stress and strain rate sensitivity vs. strain rates at different temperatures were also determined by incremental strain rate tests. The results showed that the value of strain rate sensitivity is higher and the flow stress is lower for NG than those for DM at the same condition. The microstructural evolution during superplastic deformation was examined and correlated to the mechanical properties for these two alloys. The influence of microstructure on the superplastic behaviors of {gamma}-TiAl alloys, and possible superplastic deformation mechanisms were finally discussed.
- Research Organization:
- Shanghai Jiao Tong Univ. (CN)
- Sponsoring Organization:
- National Natural Science Foundation of the People Republic of China
- OSTI ID:
- 20001646
- Report Number(s):
- CONF-981104--; ISBN 1-55899-458-0; ISSN 1067-9995
- Country of Publication:
- United States
- Language:
- English
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