Muthanna Journal of Engineering and Technology
Volume (4), Issue (2), Year (30 December 2016), Pages (56-65)
DOI:10.52113/3/eng/mjet/2016-04-02/56-65
Research Article By:
Haider Tawfiq Naeem
Corresponding author E-mail: dr.haider.ta@mu.edu.iq
ABSTRACT
Productions of surfaces composites have high mechanical properties and altered microstructural is attracting considerable attention. One of the methods of fabricating composite surfaces of aluminium matrix alloys are the procedure of Friction Stir Process (FSP). In this investigation, the producing for the surface composites of Aluminum_Zinc_Magnesium_Copper alloy (7000 series) with the pulverizing particulates of (Al_5wt%Zn_2.5wt%Mg_1.5wt%Cu_4wt%, 6%, 8% Ni), as the reinforcement particles using FSP was discussed. The reinforcements were from Al_Zn_Mg_Cu particulates as well various nickel powder (mass percentages) synthesized using the high-energy, ball milling alloying process. Composites samples underwent for the homogenizing treatment through various temperatures. These samples have subjected the ageing treat with 120 °C for one day. Results showed a 70% decrease in the grain sizes of the surface of composites Al-alloys compared with as-received Al-alloy. The grain refinement and uniform dispersion of the reinforcements during the Al-matrix were obtained because of the optimized parameters of FSP. The intensity of precipitations intermetallic, which as reinforcements increased after heat treatments along with the phases of the precipitates. The effects of the grain reduction and intercompounds with the precipitation phases led to a valuable rise in the hardness property of surface of aluminium 7000 alloy reinforced composities.
Keywords: Strengthening intermetallic, mechanical alloying, FSP.