TY - GEN
T1 - Superplasticity in a coarse-grained 6061 Al and the liquid phase effect
AU - Nieh, T. G.
AU - Kaibyshev, R.
AU - Musin, F.
AU - Lesuer, D. R.
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 1998
Y1 - 1998
N2 - Over the last decade, superplasticity at high strain rates (>10-1 s-1) has been reported in many fine grain structural materials, including Al-base and Mg-base composites, mechanically-alloyed materials, and modified conventional alloys. Many recent experimental results suggest that the presence of a small amount of liquid phase at interfaces or grain boundaries not only enhances the strain rate for superplasticity, but also has a strong influence on the deformation mechanisms. In the present paper, high temperature properties of conventional 6061 Al (grain size approximately 200 μm) are examined. Tensile properties were evaluated at temperatures ranging from 500 to 610 °C, and at strain rate ranging from 10-5 s-1 to 2×10-2 s-1. Experimental results indicate that the ductility of the alloy depends upon both strain rate and temperature. The maximum strain rate sensitivity is about 0.7. The optimal tensile elongation (350%) was, in fact, obtained at 10-4 s-1 and 590 °C, slightly above the solidus temperature of the alloy (582 °C). The role of liquid phase on ductility is discussed.
AB - Over the last decade, superplasticity at high strain rates (>10-1 s-1) has been reported in many fine grain structural materials, including Al-base and Mg-base composites, mechanically-alloyed materials, and modified conventional alloys. Many recent experimental results suggest that the presence of a small amount of liquid phase at interfaces or grain boundaries not only enhances the strain rate for superplasticity, but also has a strong influence on the deformation mechanisms. In the present paper, high temperature properties of conventional 6061 Al (grain size approximately 200 μm) are examined. Tensile properties were evaluated at temperatures ranging from 500 to 610 °C, and at strain rate ranging from 10-5 s-1 to 2×10-2 s-1. Experimental results indicate that the ductility of the alloy depends upon both strain rate and temperature. The maximum strain rate sensitivity is about 0.7. The optimal tensile elongation (350%) was, in fact, obtained at 10-4 s-1 and 590 °C, slightly above the solidus temperature of the alloy (582 °C). The role of liquid phase on ductility is discussed.
UR - http://www.scopus.com/inward/record.url?scp=0031652670&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-0031652670&origin=recordpage
M3 - RGC 32 - Refereed conference paper (with host publication)
T3 - TMS Annual Meeting
SP - 137
EP - 144
BT - Superplasticity and Superplastic Forming
PB - Minerals, Metals & Materials Soc (TMS)
T2 - Proceedings of the 1998 TMS Annual Meeting
Y2 - 15 February 1998 through 19 February 1998
ER -