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Fifty years of Harper-Dorn creep: a viable creep mechanism or a Californian artifact?

Fifty years of Harper-Dorn creep: a viable creep mechanism or a Californian artifact?
Fifty years of Harper-Dorn creep: a viable creep mechanism or a Californian artifact?
Fifty years ago, in a series of classic creep experiments conducted at the University of California in Berkeley, Harper and Dorn obtained unique experimental data revealing the possibility of a new and heretofore unrecognized flow process occurring in pure aluminum when tested at low stresses and at temperatures very close to the melting temperature. This flow mechanism, subsequently designated Harper–Dorn creep, has been the center of much argument and speculation in the ensuing years. The present paper looks back over the last half-century and charts the various developments in attempts to obtain a more detailed understanding of whether Harper–Dorn creep is (or is not) a viable creep process. Examples are presented for both metals and non-metals. It is concluded that, although it appears Harper–Dorn creep may occur only under restricted conditions associated with high purity materials and low initial dislocation densities, nevertheless there is good evidence supporting the validity of this creep mechanism as a viable and unique flow process.
0022-2461
409-420
Kumar, Praveen
6061332b-68e8-46ec-92ce-8ec6025748af
Kassner, Michael E.
44ea4d79-4e98-4160-b3d4-40335133fe9a
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kumar, Praveen
6061332b-68e8-46ec-92ce-8ec6025748af
Kassner, Michael E.
44ea4d79-4e98-4160-b3d4-40335133fe9a
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Kumar, Praveen, Kassner, Michael E. and Langdon, Terence G. (2007) Fifty years of Harper-Dorn creep: a viable creep mechanism or a Californian artifact? Journal of Materials Science, 42 (2), 409-420. (doi:10.1007/s10853-006-0782-4).

Record type: Article

Abstract

Fifty years ago, in a series of classic creep experiments conducted at the University of California in Berkeley, Harper and Dorn obtained unique experimental data revealing the possibility of a new and heretofore unrecognized flow process occurring in pure aluminum when tested at low stresses and at temperatures very close to the melting temperature. This flow mechanism, subsequently designated Harper–Dorn creep, has been the center of much argument and speculation in the ensuing years. The present paper looks back over the last half-century and charts the various developments in attempts to obtain a more detailed understanding of whether Harper–Dorn creep is (or is not) a viable creep process. Examples are presented for both metals and non-metals. It is concluded that, although it appears Harper–Dorn creep may occur only under restricted conditions associated with high purity materials and low initial dislocation densities, nevertheless there is good evidence supporting the validity of this creep mechanism as a viable and unique flow process.

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More information

Published date: January 2007
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 48867
URI: http://eprints.soton.ac.uk/id/eprint/48867
ISSN: 0022-2461
PURE UUID: d1cced81-3491-4485-aa9d-2db2c582678a
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 16 Oct 2007
Last modified: 16 Mar 2024 03:28

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Contributors

Author: Praveen Kumar
Author: Michael E. Kassner

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