Влияние армирования TiC и TiB2 на свойства и структуру алюминиевого сплава АМг2

Abstract

The paper presents the results of a study devoted to studying the effect of the type of reinforcing phase on the structure and properties of an aluminum matrix composite material (AMCM) obtained by the method of self-propagating high-temperature synthesis (SHS) in a melt. In the course of the research, an analysis was carried out and a choice was made to use titanium carbide and titanium diboride as reinforcing phases. During the experimental synthesis of SHS in the melt, composite materials AMg2 – 10 % TiC and AMg2 – 10 % TiB2 were obtained. In the course of further studies, microstructural, micro-X-ray spectral and X-ray phase analyzes were carried out, according to the results of which it was revealed that the technology used leads to the formation of the target TiC phase in the AMg2 – 10 % TiC composite and TiB2, Al3Ti phases in the AMg2 – 10 % TiB2 composite. On the synthesized samples of composite materials, an assessment was made of physical and mechanical characteristics: hardness, porosity and electrical conductivity. It was found that the hardness of AMCM obtained by the SHS method based on the industrial alloy AMg2 reinforced with titanium carbide is higher than the hardness of AMCM reinforced with titanium diboride by 44 MPa. Also, the porosity of the AMg2 – 10 % TiC composite is lower than that of the AMg2 – 10 % TiB2 composite by 6 %. This paper also shows the effect of heat treatment on the physical and mechanical properties of AMg2 – 10 % TiC and AMg2 – 10 % TiB2 composite materials. Carrying out additional heating leads to an increase in the hardness values of composite materials, as well as to a decrease in porosity. According to the results of a complex of studies, the use of titanium carbide is recommended as a reinforcing phase.