Temperature-dependent strain hardening, precipitation and deformation-induced microstructure evolution in AA 6061
| Autor: | Ernst Kozeschnik, Johannes Kreyca |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Precipitation (chemistry) Mechanical Engineering Metallurgy Alloy 02 engineering and technology Strain hardening exponent engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Mechanics of Materials visual_art 0103 physical sciences Aluminium alloy visual_art.visual_art_medium engineering General Materials Science Deformation (engineering) Composite material Dislocation 0210 nano-technology Softening |
| Zdroj: | Materials Science and Engineering: A. 708:411-418 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2017.10.027 |
| Popis: | The effect of β ′′ precipitation on strain hardening and yield stress evolution in an A6061 aluminium alloy is studied experimentally and through thermokinetic computer simulation. Samples were deformed by compression at temperatures from 25 to 500 °C to strains of about 0.4 and three different precipitation states. Simulations on the thermal stability of β ′′ are conducted on an equivalent model Al-Mg-Si alloy resulting in an explanation for the experimentally observed softening at intermediate temperatures. EBSD micrographs confirm that different dislocation storage and annihilation mechanisms are operative at low and high temperatures. The low temperature microstructure correlates very well with the subgrain structures typically observed during stage IV strain hardening. |
| Databáze: | OpenAIRE |
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