Deformation mechanisms of Al0.1CoCrFeNi at elevated temperatures
| Autor: | Peter K. Liaw, Yugang Wang, Z. Tang, Robert J. Carroll, Tengfei Yang, Gongyao Wang, Yanwen Zhang, Xie Xie, Karin A. Dahmen |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metallurgy 02 engineering and technology Work hardening Strain rate 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Deformation mechanism Mechanics of Materials 0103 physical sciences Ultimate tensile strength General Materials Science Composite material Elongation Dislocation 0210 nano-technology Necking |
| Zdroj: | Materials Science and Engineering: A. 684:552-558 |
| ISSN: | 0921-5093 |
| Popis: | Deformation mechanisms of a high-entropy alloy with a single face-centered-cubic phase, Al0.1CoCrFeNi, at elevated temperatures are studied to explore the high temperature performances of high-entropy alloys. Tensile tests at a strain rate of 10−4 s−1 are performed at different temperatures ranging from 25 to 700 °C. While both yield strength and ultimate tensile strength decrease with increasing temperature, the maximum elongation to fracture occurred at 500 °C. Transmission electron microscopy characterizations reveal that, at both 25 and 500 °C, most of deformation occurs by dislocation glide on the normal face-centered-cubic slip system, {111}〈110〉. In contrast, numerous stacking faults are observed at 600 and 700 °C, accompanied by the decreasing of dislocation density, which are attributed to the motion of Shockley partials and the dissociation of dislocations, respectively. According to the Considere's criterion, it is assumed that the dissociation of dislocations and movement of Shockley partials at higher temperatures significantly decreases the work hardening during tensile tests, promoting the early onset of necking instability and decreasing the high-temperature ductility. |
| Databáze: | OpenAIRE |
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