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77-30569/330611 Investigation of the processes of laser doping of aluminum alloy surfaces
Engineering Education # 03, March 2012
This paper presents an analysis of scientific information on the experiments carried out in the field of laser doping of aluminum alloy surfaces with various components in a wide range of treatment modes with different types of lasers. The authors analyzed laser alloying of aluminum alloys with non-metallic components, laser alloying of aluminum alloys with metallic components and laser alloying of aluminum alloy with compounds. It was found that laser alloying of aluminum alloy with metal components, their mixtures and alloys increases surface performance. A distinctive feature of the structure formation of doped zones of aluminum alloys is high satiation of solid solution which exceeds solubility under equilibrium conditions as well as formation of intermetallic compounds. It is shown that there is a real possibility of laser hardening of aluminum alloys: by changing the parameters of the surface treatment with a pulsed or continuous laser beam one can control the characteristics of doped zones, such as size, concentration, saturation components, structure, and microhardness.
77-30569/330149 Laser cladding application for elimination of defects on titanium-alloy samples
Engineering Education # 03, March 2012
Experimental studies of bond strength using the standard method of GOST1497-84 on titanium alloy specimens (Ti6Al4V) were conducted. The crack was simulated on the samples, then it was cladded using laser treatment and determined the destructive load for each sample. According to test results the optimal cladding parameters were chosen so that mechanical properties of the specimen with a cladded crack practically did not differ from the intact sample (the value of the destructive load for cladded sample was Pmax = 62,8 kN, while for the intact sample Pmax = 63 kN). Failure occured far from the cladded area.
 
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