Han, B.Q. and Langdon, T.G.
Significance of microstructural thermal stability in an Al-2219 alloy processed by severe plastic deformation.
Zhu, Y.T., Langdon, T.G., Mishra, R.S., Semiatin, S.L., Saran, M.J. and Lowe, T.C. (eds.)
Ultrafine grained materials II.
2002 TMS Annual Meeting and Exhibition
The Minerals, Metals & Materials Society.
Full text not available from this repository.
A commercial Al-2219 alloy was subjected to severe plastic deformation by processing through equal-channel angular pressing (ECAP) at room temperature. Ultrafine grains having an average size of about 0.2 ?m were present after totals of 8 and 12 passes through the ECAP die. Tensile testing of the as-pressed samples revealed no evidence for superplasticity at temperatures from 573 to 673 K. Careful microstructural examination showed that, although ?? or ? precipitates are present in the microstructure of the Al-2219 alloy, these precipitates are not sufficiently strong to prevent extensive grain growth at these elevated temperatures. It is concluded that thermal stability of the microstructure following severe plastic deformation is an important requirement in achieving superplastic ductilities at elevated temperatures.
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