Effects of temperature on the superplastic characteristics of a powder metallurgy pure aluminum

The effects of rolling temperature and testing temperature on the superplastic characteristics of 1N90 pure aluminum fabricated by a P/M method were investigated. The following results were obtained. Hot rolling > 723K has a refining effect to develop a fine grained microstructure in 1N90 pure Al...

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Bibliographic Details
Published in:Scripta materialia 1996-11, Vol.35 (10), p.1189-1193
Main Authors: Imai, T, Kojima, S, L'Esperance, G, Hong, B D, Jiang, D, Nieh, T G
Format: Article
Language:English
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Summary:The effects of rolling temperature and testing temperature on the superplastic characteristics of 1N90 pure aluminum fabricated by a P/M method were investigated. The following results were obtained. Hot rolling > 723K has a refining effect to develop a fine grained microstructure in 1N90 pure Al. When it is hot-rolled < 673K it has an elongated and coarse grained microstructure. 1N90 pure Al hot-rolled > 773K exhibits a strain rate sensitivity (m value) of 0.40-0.47 and a total elongation of 200-400% at 913K and at strain rate range of 0.015-0.05 s exp -1 . 1N90 pure Al hot-rolled at 903K and deformed at 893Kapprox913K exhibits a m value of 0.4approx0.47 and a total elongation of approx400% in the strain rate range from 0.01-0.02 s exp -1 , which indicates that the 1N90 pure Al could produce relatively high strain rate superplasticity.
ISSN:1359-6462
DOI:10.1016/1359-6462(96)00288-6