Effect of Minor Er Additions on the Microstructures and Mechanical Properties of Cast Al-Cu-Mg-Ag Alloys
| Autor: | Juangang Zhao, Jing Cao, Zhiyi Liu, Guo Shuai, Linnan Ou, Lei Luo, Haoyu Xie, Song Bai |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science Scanning electron microscope Alloy Nucleation 02 engineering and technology engineering.material precipitation 01 natural sciences Article Er Phase (matter) 0103 physical sciences Ultimate tensile strength General Materials Science Composite material 010302 applied physics Microscopy QC120-168.85 QH201-278.5 Al-Cu-Mg-Ag alloy 021001 nanoscience & nanotechnology Microstructure Engineering (General). Civil engineering (General) Ω phase TK1-9971 Descriptive and experimental mechanics Vickers hardness test engineering Grain boundary Electrical engineering. Electronics. Nuclear engineering TA1-2040 θ′ phase 0210 nano-technology |
| Zdroj: | Materials Volume 14 Issue 15 Materials, Vol 14, Iss 4212, p 4212 (2021) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma14154212 |
| Popis: | The microstructures and mechanical properties of novel cast Al-Cu-Mg-Ag alloys with and without minor additions of Er (0.09 and 0.2 wt %) are investigated by Vickers hardness tests, tensile tests, optical metallographic examination, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The results reveal that the Er addition decreases the hardness value of peak-aged Al-Cu-Mg-Ag alloy but has little influence on the time required for achieving the peak aging condition. Meanwhile, the Ω phase is suppressed in Er-added alloys, leading to a lower tensile strength at room temperature, which causes the (Mg, Ag, Er, V, Ti)-rich phase in the matrix in Er-added alloys. This blocky phase consumes available Mg and Ag atoms for Ω nucleation, leading to the low number density of Ω plates. The strength properties of Er-added alloys at 300 °C are found to be enhanced, which benefits from the pinning effect of the Al8Cu4Er phase on grain boundaries. Meanwhile, the brittle fracture of Er-added alloys at room temperature is directly associated with the Al8Cu4Er phase and the blocky (Mg, Ag, Er, V, Ti)-rich phase, which acts as the source of microcracks during deformation. In addition, no obvious grain refinement effect can be observed in Er-added alloys. |
| Databáze: | OpenAIRE |
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