Work-Hardening and Recovery Studies of Pure Aluminium.
The effects of work-hardening and recovery on the strength of pure aluminium have been investigated. The modes of interaction of these two processes during creep deformation were closely examined. The Bailey-Orowan equation was derived without recourse to a mechanical equation of state. This new met...
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| Formato: | Tesis |
| Lenguaje: | inglés |
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Obafemi Awolowo University
2014
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| Acceso en línea: | http://localhost:8080/xmlui/handle/123456789/3536 |
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| _version_ | 1810764576579387392 |
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| author | Ojediran, Surajudeen Oluwafemi |
| author2 | Ajaja., O. |
| author_facet | Ajaja., O. Ojediran, Surajudeen Oluwafemi |
| author_sort | Ojediran, Surajudeen Oluwafemi |
| collection | DSpace |
| description | The effects of work-hardening and recovery on the strength of pure aluminium have been investigated. The modes of interaction of these two processes during creep deformation were closely examined. The Bailey-Orowan equation was derived without recourse to a mechanical equation of state. This new method of derivation clearly showed that the Bailey-Orowan equation is applicable only to steady-state but not to transient creep deformation.
The results of recovery tests performed on prestrained samples showed that the flow stress decreased with recovery time, eventually approaching an asymptotic value which was appreciably higher than the flow stress of the annealed sample. It was demonstrated that the recovery rate was not a unique function of the instantaneous dislocation density.
Stress increment and stress removal (state recovery) tests performed on the creeping samples showed the generation of appreciable instantaneous plastic strains during the stress hike, and high strain rates following recovery. Both of these observations are consistent with the promise that creep is recovery-controlled in this material. |
| format | Thesis |
| id | oai:ir.oauife.edu.ng:123456789-3536 |
| institution | My University |
| language | English |
| publishDate | 2014 |
| publisher | Obafemi Awolowo University |
| record_format | dspace |
| spelling | oai:ir.oauife.edu.ng:123456789-35362023-05-13T11:11:40Z Work-Hardening and Recovery Studies of Pure Aluminium. Ojediran, Surajudeen Oluwafemi Ajaja., O. Aluminium work-hardening Bailey-Orowan equation transient creep deformation asymptotic value recovery rate The effects of work-hardening and recovery on the strength of pure aluminium have been investigated. The modes of interaction of these two processes during creep deformation were closely examined. The Bailey-Orowan equation was derived without recourse to a mechanical equation of state. This new method of derivation clearly showed that the Bailey-Orowan equation is applicable only to steady-state but not to transient creep deformation. The results of recovery tests performed on prestrained samples showed that the flow stress decreased with recovery time, eventually approaching an asymptotic value which was appreciably higher than the flow stress of the annealed sample. It was demonstrated that the recovery rate was not a unique function of the instantaneous dislocation density. Stress increment and stress removal (state recovery) tests performed on the creeping samples showed the generation of appreciable instantaneous plastic strains during the stress hike, and high strain rates following recovery. Both of these observations are consistent with the promise that creep is recovery-controlled in this material. 2014-08-26T13:59:40Z 2018-10-29T11:21:06Z 2014-08-26T13:59:40Z 2018-10-29T11:21:06Z 1985 Thesis APA http://localhost:8080/xmlui/handle/123456789/3536 en pdf application/pdf Obafemi Awolowo University |
| spellingShingle | Aluminium work-hardening Bailey-Orowan equation transient creep deformation asymptotic value recovery rate Ojediran, Surajudeen Oluwafemi Work-Hardening and Recovery Studies of Pure Aluminium. |
| title | Work-Hardening and Recovery Studies of Pure Aluminium. |
| title_full | Work-Hardening and Recovery Studies of Pure Aluminium. |
| title_fullStr | Work-Hardening and Recovery Studies of Pure Aluminium. |
| title_full_unstemmed | Work-Hardening and Recovery Studies of Pure Aluminium. |
| title_short | Work-Hardening and Recovery Studies of Pure Aluminium. |
| title_sort | work hardening and recovery studies of pure aluminium |
| topic | Aluminium work-hardening Bailey-Orowan equation transient creep deformation asymptotic value recovery rate |
| url | http://localhost:8080/xmlui/handle/123456789/3536 |
| work_keys_str_mv | AT ojediransurajudeenoluwafemi workhardeningandrecoverystudiesofpurealuminium |