Simultaneously improving the strength and ductility of an Al-5.5Mg-1.6Li-0.1Zr alloy via warm multi-pass ECAP
| Autor: | Cheng Li, Yuchun Yuan, Yuna Wu, Jinghua Jiang, Ting Yuan, Aibin Ma |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Pressing Materials science Mechanical Engineering Alloy chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences chemistry Coupling effect Mechanics of Materials Aluminium 0103 physical sciences Ultimate tensile strength engineering General Materials Science Composite material Elongation 0210 nano-technology Ductility |
| Zdroj: | Materials Characterization. 151:530-541 |
| ISSN: | 1044-5803 |
| DOI: | 10.1016/j.matchar.2019.03.043 |
| Popis: | Overcoming the ductility inadequacy while maintaining relatively high strength of Al Li alloys is in urgent need for developing new low-density and high-performance aerospace aluminum alloys. In this research, a warm multi-pass equal-channel angular pressing (ECAP) process was developed to simultaneously improve the strength and ductility of an Al-5.5Mg-1.6Li-0.1Zr alloy. The effects of the process on the microstructure evolution, plastic deformation and strengthening mechanism were also investigated. Results show that the ultimate strength (UTS) and elongation to failure (EL) of ultrafine-grained (UFG) alloy after 16 ECAP passes at 300 °C reach up to 476 MPa and 21.6% respectively, about 74% and 108% higher than those of the as-cast sample with coarse grains. The great improvement can be attributed to the coupling effect of the UFG microstructure and uniform distribution of large number of precipitates. |
| Databáze: | OpenAIRE |
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