Understanding creep mechanisms of a Cu-Cr-Nb alloy by testing under constant structure conditions
| Autor: | J. C. Gibeling, M. Zhang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Alloy Metals and Alloys 02 engineering and technology Activation energy engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Stress (mechanics) Deformation mechanism Creep Mechanics of Materials 0103 physical sciences engineering Climb General Materials Science Dislocation Composite material 0210 nano-technology Constant (mathematics) |
| Zdroj: | Scripta Materialia. 190:131-135 |
| ISSN: | 1359-6462 |
| DOI: | 10.1016/j.scriptamat.2020.08.036 |
| Popis: | Stress reduction creep tests conducted on a Cu-Cr-Nb alloy (GRCop-84) at 923 K have confirmed local dislocation climb to be the rate-controlling deformation mechanism. The activation energy of creep was measured to be consistent with that of self-diffusion in Cu matrix. An internal back stress of approximately -9 MPa was identified to act on the rate-controlling dislocations, which is believed to be the sum of the back stress for dislocation-particle interaction and the forward stress for dislocation-dislocation interaction. This back stress, however, does not lead to a true threshold in the framework of thermally activated dislocation motion. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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