Effect of ECAP temperature on microstructure and mechanical properties of Al–Zn–Mg–Cu alloy
| Autor: | M.T. Salehi, M. Shaeri, Mahmoud Ebrahimi, S. H. Seyyedein, M.H. Shaeri |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Equal channel angular pressing Alloy Mechanical properties 02 engineering and technology engineering.material 01 natural sciences Indentation hardness Precipitation hardening 0103 physical sciences lcsh:TA401-492 General Materials Science General Microstructure Strengthening mechanisms of materials Diffractometer 010302 applied physics Strengthening mechanisms Metallurgy 021001 nanoscience & nanotechnology engineering lcsh:Materials of engineering and construction. Mechanics of materials Dislocation 0210 nano-technology Solid solution |
| Zdroj: | Progress in Natural Science: Materials International, Vol 26, Iss 2, Pp 182-191 (2016) |
| ISSN: | 1002-0071 |
| Popis: | The effect of equal channel angular pressing (ECAP) at different temperatures (room temperature, 120, 150 and 180 °C) on microstructure and mechanical properties of Al-7075 solid solution alloy was investigated. Microstructure of the specimens was examined using orientation imaging microscopy, transmission electron microscopy as well as X-ray diffractometer, and mechanical properties were measured by Vickers microhardness and tensile tests. Microstructural investigations showed that after 3 or 4 passes of ECAP, fine grains with average grain sizes in range of 300–1000 nm could be obtained at different ECAP temperatures. Increasing ECAP temperature from 120 to 180 °C caused a decrease in mechanical properties as a result of increasing grains and precipitates sizes, decreasing fraction of high angle boundaries and also transformation of η′ into η phase, while increasing ECAP temperature from RT to 120 °C leads to an increase in mechanical properties due to the formation of small η′ precipitates. So it can be concluded that ECAP process at 120 °C is the optimum process for attaining maximum mechanical properties. Quantitative estimates of various strengthening mechanisms revealed that the improvement of mechanical properties was mainly attributed to grain refinement strengthening, precipitation strengthening and dislocation strengthening. |
| Databáze: | OpenAIRE |
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