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).

Galvanic corrosion is a well-known phenomenon, which occurs when two different metals exposed to the same conditions exhibit differential corrosion rates. The corrosion process is accelerated by the exchange electrons between the metals. In this study, we created a novel layered structure of Cu and Al for efficient electron extraction through charge transfer. Using this Cu/Al laminated structure configuration and galvanic corrosion effect, an open-circuit voltage of approximately −160 mV was generated by measuring the difference in potential between the metal and a useful indicator of the electrochemical dynamics of the system. Furthermore, we effectively transmitted electrons between the metal in the layered structure, as demonstrated by the extraction of a charge of approximately 10−5 C. These results show the potential of using a laminated structure to take advantage of galvanic corrosion as energy generation and electrochemical sensing.