Структурa і властивості магнітострикційних матеріалів систем Fe-Ga та Fe-Ga-Al

• Date: 2025
• Main Authors: Goncharuk, D. A., Baglyuk, G. A., Khomenko, О. І.
• Format: Article
• Language: Ukrainian
• Published: Physico- Technological Institute of Metals and Alloys of the NAS of Ukraine 2025
• Subjects: Fe; Al; Ga; мікроструктура; фазоутворення; мікротвердість; механічні характеристики на стиснення
• Online Access: https://momjournal.org.ua/index.php/mom/article/view/2025-1-1
• Journal Title: Metal Science and Treatment of Metals

The article presents the results of studies of the structure and phase composition of powder materials of two- and three-component systems Fe –Ga and Fe –Ga – Al, and determines some of their properties. Samples for research were obtained from a mixture of previously obtained and crushed ligature of composition Fe – 44.9 wt.% Ga (50 at. % Ga), with iron powders (sprayed) and aluminum (pulverized). 7 batches of different compositions of mixtures were produced, which had either only two components, namely Fe – 17.5 wt.% Al and Fe – 21.5 wt.% Ga, or all three components with gradual replacement of Al by Ga. The mixtures were compacted under a pressure of 700 MPa in the form of cylindrical pressings, which were then sintered at a temperature of 1150 oC for 1 h in a neutral environment of pure Ar (99.99 % Ar). The structure and phase composition of the obtained materials were studied. Mechanical tests were conducted under uniaxial compression conditions, corrosion resistance was determined, and magnetostrictive properties of samples from materials that are most promising for use as magnetostrictive materials were evaluated. An increase in hardness and level of compressive strength of the material composition (% wt.): Fe –1.7Al – 19.3Ga compared to the material composition Fe – 21.5 wt. %Ga was found. In terms of corrosion resistance, both of these materials belong to corrosion-resistant materials (3 – 4 points on a 10-point scale of corrosion resistance). To study magnetic properties, the method of comparative assessment of magnetostriction relative to the standard, which was a sample of pure powdered iron, was used. The experiments used specially designed equipment to observe the dynamics of the processes of remagnetization of the material in an alternating magnetic field. It was found that the highest level of magnetostriction is possessed by materials of the dual composition Fe – 21.5 wt. %Ga (> 210 ppm, ppm=10-6). The material of the composition Fe – 19.3 wt. %Ga – 1.75 wt. %Al, which had a lower level of elasticity in compression, was also distinguished by a lower value of magnetostriction ( >  130 ppm). The level of magnetostriction of the studied materials is within the requirements for commercial deformed alloys Fe – Ga (galphenols).