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Grain refinement of pure nickel using equal-channel angular pressing

Grain refinement of pure nickel using equal-channel angular pressing
Grain refinement of pure nickel using equal-channel angular pressing
Nickel of 99.9% purity, with an initial grain size of ~80 ?m, was subjected to equal-channel angular pressing (ECAP) to a strain of ~8 at room temperature. After ECAP, there was a homogeneous microstructure of very fine grains separated by high-angle boundaries. The average grain size was measured as ~0.30 ?m. Annealing of samples after ECAP revealed an abrupt increase in the grain size, to ~4–5 ?m, at temperatures in the range of 473–573 K: it is shown this behavior is analogous to conventional recrystallization. The results for pure Ni are compared with data obtained when ECAP is applied to pure Al and pure Cu. It is concluded that pure Ni is an ideal model material for use in ECAP because the stacking fault energy, which is intermediate between that of pure Al and pure Cu, leads to a much smaller grain size than in pure Al but a more homogeneous microstructure than in pure Cu.
equal-channel angular pressing, grain refinement, hardness, nickel, recrystallization
54-58
Neishi, Koji
b1382443-5df8-4465-9a29-0affb8f9fea3
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Neishi, Koji
b1382443-5df8-4465-9a29-0affb8f9fea3
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Neishi, Koji, Horita, Zenji and Langdon, Terence G. (2002) Grain refinement of pure nickel using equal-channel angular pressing. Materials Science and Engineering, 325 (1-2), 54-58. (doi:10.1016/S0921-5093(01)01404-6).

Record type: Article

Abstract

Nickel of 99.9% purity, with an initial grain size of ~80 ?m, was subjected to equal-channel angular pressing (ECAP) to a strain of ~8 at room temperature. After ECAP, there was a homogeneous microstructure of very fine grains separated by high-angle boundaries. The average grain size was measured as ~0.30 ?m. Annealing of samples after ECAP revealed an abrupt increase in the grain size, to ~4–5 ?m, at temperatures in the range of 473–573 K: it is shown this behavior is analogous to conventional recrystallization. The results for pure Ni are compared with data obtained when ECAP is applied to pure Al and pure Cu. It is concluded that pure Ni is an ideal model material for use in ECAP because the stacking fault energy, which is intermediate between that of pure Al and pure Cu, leads to a much smaller grain size than in pure Al but a more homogeneous microstructure than in pure Cu.

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More information

Published date: 2002
Keywords: equal-channel angular pressing, grain refinement, hardness, nickel, recrystallization

Identifiers

Local EPrints ID: 23852
URI: http://eprints.soton.ac.uk/id/eprint/23852
PURE UUID: d4ac9dd0-0c10-4bf1-9591-9b703c0d1cd4
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 24 Mar 2006
Last modified: 10 Dec 2019 01:47

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