The mechanism of creep in polycrystalline magnesium oxide
The mechanism of creep in polycrystalline magnesium oxide
Polycrystalline magnesium oxide, nominally fully-dense (>99.8% theoretical), was tested in compressive creep at a temperature of 1200°C and under initial applied stresses of 3.44 × 108−13.76 × 108 dynes/cm2. The observed steady-state creep rates were independent of grain size in the range ~12–52μm, and proportional to σ3.3, where σ is the applied stress. The activation energy was determined as 51 ± 5 kcal/mole. The results show that the creep behavior of polycrystalline MgO is similar to that observed in many metals. An analysis of the data in terms of various creep theories suggests that a dislocation mechanism is rate-controlling, such as the climb of dislocations without accompanying glide.
505-510
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Pask, J.A.
3ce034cc-a379-4358-b35d-99ed154fb45c
May 1970
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Pask, J.A.
3ce034cc-a379-4358-b35d-99ed154fb45c
Langdon, T.G. and Pask, J.A.
(1970)
The mechanism of creep in polycrystalline magnesium oxide.
Acta Metallurgica et Materialia, 18 (5), .
(doi:10.1016/0001-6160(70)90137-9).
Abstract
Polycrystalline magnesium oxide, nominally fully-dense (>99.8% theoretical), was tested in compressive creep at a temperature of 1200°C and under initial applied stresses of 3.44 × 108−13.76 × 108 dynes/cm2. The observed steady-state creep rates were independent of grain size in the range ~12–52μm, and proportional to σ3.3, where σ is the applied stress. The activation energy was determined as 51 ± 5 kcal/mole. The results show that the creep behavior of polycrystalline MgO is similar to that observed in many metals. An analysis of the data in terms of various creep theories suggests that a dislocation mechanism is rate-controlling, such as the climb of dislocations without accompanying glide.
This record has no associated files available for download.
More information
Accepted/In Press date: 11 August 1969
Published date: May 1970
Identifiers
Local EPrints ID: 488206
URI: http://eprints.soton.ac.uk/id/eprint/488206
ISSN: 0956-7151
PURE UUID: 5ca256d3-e581-452c-97c4-94170e082748
Catalogue record
Date deposited: 18 Mar 2024 17:52
Last modified: 19 Mar 2024 02:37
Export record
Altmetrics
Contributors
Author:
J.A. Pask
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
