Effects of Al on the mechanism of high temperature deformation of Mg-xAl alloys
| Autor: | Fubo Bian, Jianhua Zhong, Jun Qiao, Min He, Jiaxing Ji |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering 02 engineering and technology Strain rate 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Stress (mechanics) Creep Mechanics of Materials Solvent drag 0103 physical sciences Ultimate tensile strength Climb General Materials Science Deformation (engineering) Dislocation Composite material 0210 nano-technology |
| Zdroj: | Materials Science and Engineering: A. 772:138715 |
| ISSN: | 0921-5093 |
| Popis: | High-temperature tests were conducted to investigate the tensile behaviors of Mg–xAl (x = 2, 3, 4, 6, 9 wt%) alloys. The mechanisms of deformation were investigated by analyzing the microstructures, stress exponents and deformation activation energy values. The results show that with the increase in the temperature and the decrease in the logarithmic strain rate, the mechanism of deformation of the Mg–xAl alloys changes from dislocation climb creep to solute drag creep, differing from the pure Mg that is consistently controlled by dislocation climb creep. Three regions are classified based on the stress exponents of the Mg–xAl alloys, and it is found that the stress exponent decreases with the increase in the Al content in each region. The Mg–xAl alloys exhibit enhanced tensile ductility of greater than 100% at 450 °C and 1 × 10−3 s−1, which is attributed to the solute-drag creep with a lower stress exponent. |
| Databáze: | OpenAIRE |
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