Superplastic Deformation of Aluminum Systems at 500-650 °C with or without Presence of Liquid Phase
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 267-272 |
Journal / Publication | Materials Science Forum |
Volume | 304-306 |
Online published | 23 Feb 1999 |
Publication status | Published - 1999 |
Externally published | Yes |
Link(s)
Abstract
Three aluminum base materials were studied over the high temperature range of 500-650 °C, in an attempt to examine the role of liquid phase on controlling deformation mechanisms based the observed m- and Q-values. For the two near-pure Al systems, the 1050 Al and AO, no solute-induced incipient partial melting was expected, and the solidus and liquidus temperatures should merge to near 655±5 °C. The m-values of these materials were consistently scattered with 0.1-0.25 up to the extrahigh temperature of 650 °C. The high activation energy in the AO material at T>600 °C is postulated to be related to the load transfer effect or bubble-induced stress reduction, but not the liquid phase role in explaining the deformation mechanism. In the 6061 Al, an appreciable amount of liquid should have been present at 590 and 610 °C. The low activation energy of 20 kJ/mole over the temperature range of 570-610 °C might reflect the transition of deformation mechanisms, though no pronounced increase in m-values was observed even at 610 °C. This result was controversial and needs future studies.
Research Area(s)
- Activation Energy, Aluminum Alloys, Aluminum Composites, Liquid Phase, Strain Rate Sensitivity, Superplastic Deformation
Citation Format(s)
Superplastic Deformation of Aluminum Systems at 500-650 °C with or without Presence of Liquid Phase. / Liauo, O.S.; Lou, B.Y.; Cheng, C.Y. et al.
In: Materials Science Forum, Vol. 304-306, 1999, p. 267-272.
In: Materials Science Forum, Vol. 304-306, 1999, p. 267-272.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review