Work-softening and anneal-hardening behaviors in fine-grained Zn–Al alloys
| Autor: | Chih-Fu Yang, Jiun-Hung Pan, Te-Hao Lee |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Astrophysics::High Energy Astrophysical Phenomena Mechanical Engineering Metallurgy Metals and Alloys Critical value Grain size Condensed Matter::Materials Science Mechanics of Materials Materials Chemistry Hardening (metallurgy) Grain boundary Softening Grain boundary strengthening |
| Zdroj: | Journal of Alloys and Compounds. 468:230-236 |
| ISSN: | 0925-8388 |
| Popis: | In this study work-softening and anneal-hardening behaviors were explored and compared in fine-grained Zn–22 Al and Zn–22 Al–0.3 Cu alloys. It was found that the work-softening behavior is enhanced by a decrease in grain size and an increase in the relative amount of high-angle boundaries. A model based on the absorption of dislocation pile-up by grain boundary is proposed to explain the work-softening behavior in these alloys. When subjected to a grain-coarsening heat treatment, ultra-fine-grained Zn–Al and Zn–Al–Cu alloys exhibit an unusual anneal-hardening behavior. But once their grain size exceeds a critical value, the Zn–Al and Zn–Al–Cu alloys resume the normal anneal-softening behavior. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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