Effects of Excessive Zr Content and Ultrasonic Treatment on Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Alloy
| Autor: | Longfei Liu, Shusen Wu, Lanqing Xia, Shulin Lü, Jianyu Li, Cheng Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
lcsh:TN1-997
Materials science squeeze casting Al-Zn-Mg-Cu alloy Alloy chemistry.chemical_element 02 engineering and technology engineering.material 01 natural sciences Phase (matter) 0103 physical sciences ultrasonic treatment composition segregation General Materials Science lcsh:Mining engineering. Metallurgy Refining (metallurgy) 010302 applied physics Zirconium Metallurgy Metals and Alloys 021001 nanoscience & nanotechnology Microstructure Grain size chemistry engineering Ultrasonic sensor 0210 nano-technology Material properties |
| Zdroj: | Metals Volume 11 Issue 4 Metals, Vol 11, Iss 632, p 632 (2021) |
| ISSN: | 2075-4701 |
| Popis: | The Zr element is one of the important grain refiners for 7xxx series Al-Zn-Mg-Cu alloys, but the effect of Zr content more than 0.15 wt.% needs to be deeply investigated under the action of ultrasonic vibration. In this study, the effects of Zr contents (0.1 to 0.25 wt.%) on microstructure and mechanical properties of Al-Zn-Mg-Cu alloy were studied. The results showed that Zr element could refine grains, but when the Zr content was greater than 0.15 wt.%, the grain size was not uniform, the number of second phase particles increased, and the segregation of components became more serious. It was found that after ultrasonic treatment, the grain-size inhomogeneity was greatly improved, and the Zr content could be added up to 0.2 wt.%. When the Zr content is equal or lower than 0.2 wt.%, ultrasonic treatment can effectively improve the mechanical properties of materials by refining grains and weakening segregation. However, when the Zr content is up to 0.25 wt.%, the effect is getting worse. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|