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Flow processes at low temperatures in ultrafine-grained aluminum

Flow processes at low temperatures in ultrafine-grained aluminum
Flow processes at low temperatures in ultrafine-grained aluminum
Experiments were conducted to evaluate the flow behavior of pure aluminum at low temperatures. Samples were processed by equal-channel angular pressing (ECAP) to give a grain size of ~1.2 ?m and compression samples were cut from the as-pressed billets and tested over a range of strain rates at temperatures up to 473 K. The results show the occurrence of steady-state flow in these highly deformed samples and a detailed analysis gives a low strain rate sensitivity and an activation energy similar to the value for grain boundary diffusion. By using depth-sensing indentation testing and atomic force microscopy, it is shown that grain boundary sliding occurs in this material at low temperatures. This result is attributed to the presence of high-energy non-equilibrium boundaries in the severely deformed samples.
equal-channel angular pressing (ecap), grain boundary sliding, non-equilibrium boundaries, plastic deformation, ultrafine grains
0921-5093
326-334
Chinh, Nguyen Q.
8e075269-61a9-469c-8f71-3d52eb37dadc
Szommer, Péter
9408a7f4-810f-4822-a272-a3c0d41ef4e5
Csanádi, Tamás
58389466-20b4-4dd0-a00e-908e133a1528
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Chinh, Nguyen Q.
8e075269-61a9-469c-8f71-3d52eb37dadc
Szommer, Péter
9408a7f4-810f-4822-a272-a3c0d41ef4e5
Csanádi, Tamás
58389466-20b4-4dd0-a00e-908e133a1528
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Chinh, Nguyen Q., Szommer, Péter, Csanádi, Tamás and Langdon, Terence G. (2006) Flow processes at low temperatures in ultrafine-grained aluminum. Materials Science and Engineering: A, 434 (1-2), 326-334. (doi:10.1016/j.msea.2006.07.014).

Record type: Article

Abstract

Experiments were conducted to evaluate the flow behavior of pure aluminum at low temperatures. Samples were processed by equal-channel angular pressing (ECAP) to give a grain size of ~1.2 ?m and compression samples were cut from the as-pressed billets and tested over a range of strain rates at temperatures up to 473 K. The results show the occurrence of steady-state flow in these highly deformed samples and a detailed analysis gives a low strain rate sensitivity and an activation energy similar to the value for grain boundary diffusion. By using depth-sensing indentation testing and atomic force microscopy, it is shown that grain boundary sliding occurs in this material at low temperatures. This result is attributed to the presence of high-energy non-equilibrium boundaries in the severely deformed samples.

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More information

Published date: 2006
Keywords: equal-channel angular pressing (ecap), grain boundary sliding, non-equilibrium boundaries, plastic deformation, ultrafine grains
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 43693
URI: https://eprints.soton.ac.uk/id/eprint/43693
ISSN: 0921-5093
PURE UUID: d56e4866-fb16-4eab-ac53-56e64e0275db
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 26 Jan 2007
Last modified: 14 Mar 2019 01:45

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