Characteristics of Al–Zn–Mg–Cu Alloys with Nickel Additives Synthesized via Mechanical Alloying, Cold Compaction, and Heat Treatment
| Autor: | Haider T. Naeem, Azmi Rahmat, Kahtan S. Mohammad, Khairel Rafezi Ahmad |
|---|---|
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Arabian Journal for Science and Engineering. 39:9039-9048 |
| ISSN: | 2191-4281 1319-8025 |
| DOI: | 10.1007/s13369-014-1432-9 |
| Popis: | Mechanical alloying was employed to synthesize Al–Zn–Mg–Cu alloys with nickel additives from elemental powders via high-energy ball milling. The milled powders were cold compacted and sintered thereafter. The sintered compacts underwent homogenization treatments at various temperature conditions and aged at 120 °C for 24 h (T6). Subsequently, the compacts were retrogressed at 180 °C for 30 min and re-aged at 120 °C for 24 h (RRA). The milled powders and heat-treated products were characterized via X-ray diffraction (XRD), scanning electron microscopy, and energy-dispersive spectroscopy. The crystallite sizes and micro-strains of the alloy powder were estimated with the broadening of XRD peaks by using the Williamson–Hall equation. The results show that Zn, Mg, and Cu atoms are soluble in the Al matrix after milling for 5 h. The Vickers hardness of Al alloys was enhanced following retrogression and re-aging treatments. The addition of nickel influenced the hardness of the compacted powders. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|