Abstract
The present study investigated the effect of zinc powder on the microstructure and mechanical properties of Al–Mg alloy friction surfaced on an AA5052 aluminum alloy substrate. The zinc powder was applied to the coating through insertion of the hole in the Al–Mg aluminum alloy consumable rod. The addition of Zn powder greatly increases the thermal stability of the coating and reduces kinetic of grain growth. Considering a linear approximation between the grain size and the heat treatment time, the grain growth rate in the coating containing Zn and Zn free is approximately 0.55 μm/h and 1.46 μm/h, respectively. Based on the XRD results in pre heat treatment condition of sample containing Zn powder, in addition to the iron-rich particles and Mg2Si, the MgZn and Mg7Zn3 particles formed. The longtime solid solution and aging treatment result in the AlMg4Zn11 precipitates in the coted sample. After 8 h heat treatment, the coating hardness reaches 70.14 BHN, which shows an increase of 14% as compared to before heat treatment.
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