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Flow behavior of aluminum-based materials at ultrahigh temperatures in the presence of a liquid phase

Flow behavior of aluminum-based materials at ultrahigh temperatures in the presence of a liquid phase
Flow behavior of aluminum-based materials at ultrahigh temperatures in the presence of a liquid phase
Experiments were conducted to determine the flow behavior of three materials at ultrahigh temperatures: an Al-6061 composite containing 20 vol% SiC whiskers and unreinforced Al-6061 and Al-1050 alloys prepared by casting. Tensile tests were performed at strain rates up to 5× 10-1 s-1 and over a range of ultrahigh temperatures up to and above the temperatures where there is a small amount of liquid phase. High strain rate superplasticity was achieved in the composite material but not in the unreinforced alloys. For all three materials, it is shown that the true activation energy for flow changes from values of <200 kJ mol-1 at the lower temperatures where there is no liquid phase to exceptionally high values in the presence of a liquid phase: these values are up to >1000 kJ mol-1 for the composite and the Al-1050 alloy. It is concluded that exceptionally high activation energies are an inherent feature of flow in materials containing a small amount of discontinuous liquid at temperatures immediately above the onset of partial melting.
high temperature deformation behavior, liquid phase, aluminum, superplasticity
1347-5320
501-509
Lou, B.Y.
e00aa433-5fc2-4dc3-8d32-0837b174f783
Wang, T.D.
dc8ff2c7-0262-46de-aed7-b360be9763ed
Huang, J.C.
d4a83517-c8ef-41e6-8531-c2a831fda0f3
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lou, B.Y.
e00aa433-5fc2-4dc3-8d32-0837b174f783
Wang, T.D.
dc8ff2c7-0262-46de-aed7-b360be9763ed
Huang, J.C.
d4a83517-c8ef-41e6-8531-c2a831fda0f3
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Lou, B.Y., Wang, T.D., Huang, J.C. and Langdon, T.G. (2002) Flow behavior of aluminum-based materials at ultrahigh temperatures in the presence of a liquid phase. Materials Transactions, 43 (3), 501-509.

Record type: Article

Abstract

Experiments were conducted to determine the flow behavior of three materials at ultrahigh temperatures: an Al-6061 composite containing 20 vol% SiC whiskers and unreinforced Al-6061 and Al-1050 alloys prepared by casting. Tensile tests were performed at strain rates up to 5× 10-1 s-1 and over a range of ultrahigh temperatures up to and above the temperatures where there is a small amount of liquid phase. High strain rate superplasticity was achieved in the composite material but not in the unreinforced alloys. For all three materials, it is shown that the true activation energy for flow changes from values of <200 kJ mol-1 at the lower temperatures where there is no liquid phase to exceptionally high values in the presence of a liquid phase: these values are up to >1000 kJ mol-1 for the composite and the Al-1050 alloy. It is concluded that exceptionally high activation energies are an inherent feature of flow in materials containing a small amount of discontinuous liquid at temperatures immediately above the onset of partial melting.

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More information

Published date: 2002
Keywords: high temperature deformation behavior, liquid phase, aluminum, superplasticity

Identifiers

Local EPrints ID: 23799
URI: http://eprints.soton.ac.uk/id/eprint/23799
ISSN: 1347-5320
PURE UUID: 6d3042ce-89c2-49b2-a14f-d10e2730216a
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 30 Mar 2006
Last modified: 23 Jul 2020 00:29

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Contributors

Author: B.Y. Lou
Author: T.D. Wang
Author: J.C. Huang
Author: T.G. Langdon ORCID iD

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