Microstructural evolution and thermal stability of 1050 commercial pure aluminum processed by high-strain-rate deformation
| Autor: | Qingming Zhang, Yang Yang, Ren Rong Long, Ya Dong Chen, Hai Bo Hu, Tie Gang Tang |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Annealing (metallurgy) Mechanical Engineering Triple junction Metallurgy chemistry.chemical_element Split-Hopkinson pressure bar Condensed Matter Physics Microstructure Indentation hardness chemistry Mechanics of Materials Aluminium Transmission electron microscopy General Materials Science Lamellar structure |
| Zdroj: | Journal of Materials Research. 30:3502-3509 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.2015.341 |
| Popis: | Microstructural and property evolution of 1050 commercial pure aluminum subjected to high-strain-rate deformation (1.2–2.3 × 103 s−1) by split Hopkinson pressure bar (SHPB) and subsequent annealing treatment were investigated. The as-deformed and their annealed samples at 373–523 K were characterized by transmission electron microscopy (TEM) and microhardness tests. TEM observations reveal that the as-deformed sample is mainly composed of a lamellar structure, whose transverse/longitudinal average subgrain/cell sizes are 293 and 694 nm, respectively. The initial coarse grains are refined significantly. The initial lamellar grain structures are subdivided into pancake-shaped subgrains due to a gradual transition by triple junction motion at 473 K, and then a dramatic microstructural coarsening is observed at 523 K. It is suggested that annealing behavior of this dynamic loading structure is better considered as a continuous process of grain coarsening or continuous recovery. |
| Databáze: | OpenAIRE |
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