WELDING ALUMINIUM ALLOYS REFRACTORY MODIFIERS TREATMENT – THE EFFECTIVE METHOD FOR CHARACTERISTICS INCREASING

The effect of modification by refractory dispersed compositions on the grain structure and properties of welded aluminium alloys is determined. Aluminium alloys of the Al-Mg-Mn system of chemical composition were studied: 4.8-6.0% magnesium, 0.3-0.5% manganese; 0.45 – 0.90% iron; aluminium - base. The iron content corresponded to the pre-eutectic and post-eutectic compositions of the aluminium-iron system. Titanium carbide (TiC) modifier powders with a dispersion of 1-5 microns obtained by the method of plasmachemical synthesis. The microstructure of the alloys was studied using MIM-8 and Neophot-2 optical microscopes. The strength properties of the alloys were determined using the MUP-20 machine. Production of samples was carried out according to GOST 1497-84 and GOST 9454-80. Fluidity was determined by the spiral sample method. The properties of alloys before and after modification were investigated. Improved technological properties of aluminium alloys after modification. Increased fluidity in AMg5 and 1420 alloys by 1.5% and 6%, respectively. The obtained homogeneous dispersed structure of aluminium alloys after modification. The strength properties of modified alloys are increased by20 %. Experiments were conducted on the effect of the charge type on the structure and properties of technically pure aluminium and aluminium alloys AMg5 and 1420. The advantage of solid charge in the smelting of aluminium ingots in reducing porosity and grinding grain in comparison with the use of liquid charge is established. The effective effect of the refractory modifier of titanium carbide on the properties of aluminium alloys is proved.

Obtaining Spherical Powders of Grade 5 Alloy for Application in Selective Laser Melting Technology

In this paper, the process of obtaining a spherical powder of titanium alloy of the “Grade 5” brand using inductively coupled argon-helium plasma has been studied. The structure of titanium alloy was studied before and after the spheroidization process. The results of particle size and X-ray fluorescent analysis were also obtained. As a result of the analysis of the structure, it was concluded that the crystallite sizes and microstress values change. Keywords: additive technology, plasmachemical synthesis, spheroidization, titanium alloy, grade 5.