The Effects of Nickel Additions on Microstructural and Hardness of Ball Milled of Al-6wt%Zn-3wt%Mg-2wt%Cu Alloys Underwent the Artificial Aging

Haider Tawfiq Naeem

Journal of Asian Scientific Research, 2016, vol. 6, issue 12, 158-168

Abstract: High-energy ball milling was employed to synthesize Al-Zn-Mg-Cu alloy (7000 series) with high weight percentage ‎of nickel from its elemental powders via mechanical alloying mechanisms. The mixed powders underwent 15 hrs of ‎milling time, 380 rpm speed and 12:1 balls/powder weight ratio. The milled powder samples were cold compacted ‎and sintered thereafter. The sintered compacts which were homogenized at 450°C for 1.5 h and aged at 124 °C for ‎‎24 hrs. The milled powders and heat-treated Al alloy products were characterized via scanning electron microscopy, ‎and energy dispersive spectroscopy. The results ‎revealed that optimum milling time of ‏‎15 ‎hrs has led to the ‏formation of solid solutions of Al‎-‎Zn‎-‎Mg‎-‎Cu ‎with Ni. The mechanical alloying mechanism allows for the ‎attainment of Al solid solutions with ‎‎‎ ‎amount of nickel and‎ dopants Zn, Mg, and Cu at a concentration that exceeds ‎their equilibrium ‎solubility compared with melting and crystallization in conventional processes‎. ‎The outcomes ‏showed ‏‎ ‎that‏ ‎the hardness of the sintered Al-Zn-Mg-Cu-Ni alloys compacts was enhanced following the artificial ‎aging treatment.‎

Keywords: Milling alloying; Al-7xxx alloys; Al-Ni compounds; Heat treatment; Hardness; SEM. (search for similar items in EconPapers)
Date: 2016
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