International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Abstract. The structure and some properties of magnetostrictive powder materials of the Fe .Ga and .Fe-(Ga+Al) systems, obtained by sintering at a temperature of 1150 oC in a neutral Ar environment for 1 h, were studied. The structure and phase composition of the obtained materials were studied. Mechanical tests of the samples were carried out, corrosion resistance was determined and magnetostrictive properties of samples of the composition Fe-Ga and Fe-1.7Al-19.3Ga were evaluated as the most promising for use as magnetostrictive materials. An increase in hardness and level of compressive strength of the material of the composition Fe-1.7Al-19.3Ga compared to materials of the composition Fe-21.4Ga was revealed. In terms of corrosion resistance, these materials are corrosion-resistant materials (3-4 points on a 10-point scale of corrosion resistance). The highest level of magnetostriction is possessed by materials of the dual composition Fe 21.5 wt.%Ga (>210 ppm). The material with the composition Fe 19.3 wt. % Ga-1.75 wt. % Al, which had a lower level of compressive elasticity, also differed in a lower value of magnetostriction (130 ppm). The level of magnetostriction of the studied materials is within the requirements for commercial deformed Fe-Ga alloys (galfenols).

X-ray diffraction analysis of the Fe-35%FKh800-(0.38-2.2%)TiB2 system samples showed that a multiphase composition of materials is formed during the sintering process. The basis of the sintered composite is the ferrite α-Fe phase, which is a metallic ironchromium matrix, with γ-Fe, complex iron-chromium carbide (Fe,Cr)7C3, and carboboride phases in small amounts: borocementite – Fe3(B0.7,C0.3) with a rhombohedral lattice and carboboride Fe23(C,B)6 with a cubic lattice and a number of carbides (Cr7C3, Cr3C2). The research established the non-monotonic nature of the effect of the TiB2 additive content on the lattice parameters of the ferrite α-Fe and austenitic γ-Fe phases, as well as on the change in the intensity of the 111 line of the austenitic phase. According to the phase composition data and studies of the fine structure (substructure) of the sintered samples of the Fe-FKh800-TiB2 system materials, it can be noted that the components of the TiB2 alloying additive take an active part in the formation of the phase composition, as well as in the process of alloying the matrix phase, which is reflected in the numerical values of the substructure parameters.