期刊
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
卷 39, 期 12, 页码 9039-9048出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s13369-014-1432-9
关键词
Al alloys; Mechanical alloying; Sintering SEM
资金
- University Malaysia Perlis (UniMAP) [9001-00338]
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 A degrees C for 24 h (T6). Subsequently, the compacts were retrogressed at 180 A degrees C for 30 min and re-aged at 120 A degrees 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.
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