Superior superplastic behavior in fine-grained Ti–6Al–4V sheet

The superplastic behavior of extremely fine-grained (300 nm) Ti–6Al–4V was studied by performing elevated temperature uniaxial tensile tests in the temperature range of 700–900 °C. The strain rate was varied from 10 −5 to 10 −1 s −1 to estimate the value of the strain rate sensitivity coefficient, m...

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Bibliographic Details
Published in:Journal of alloys and compounds 2002-10, Vol.345 (1), p.221-227
Main Authors: Patankar, S.N, Escobedo, J.P, Field, D.P, Salishchev, G, Galeyev, R.M, Valiakhmetov, O.R, Froes, F.H.(Sam)
Format: Article
Language:English
Subjects:
Mechanical properties
Microstructure
Transition metal alloys
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Summary:The superplastic behavior of extremely fine-grained (300 nm) Ti–6Al–4V was studied by performing elevated temperature uniaxial tensile tests in the temperature range of 700–900 °C. The strain rate was varied from 10 −5 to 10 −1 s −1 to estimate the value of the strain rate sensitivity coefficient, m. The ductility of the fine-grained Ti–6Al–4V specimens was compared with that of a control set of conventional superplastic Ti–6Al–4V specimens with an average grain size of 3 μm. The results obtained indicate that the fine grain sized materials should see application in commercial use, with the caveat that a 1-μm grain size is considered optimum in terms of the superplastic forming temperature and subsequent creep behavior at use temperature.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(02)00406-1