Linear wireless strain sensor using FeAlB and Metglas

Summary form only given. In this work we investigate a wireless strain sensor where a polycrystalline FeAlB alloy has been used for the transducer. Fe80Al20 with about 2% B has been shown to have a magnetostriction of about 80 ppm at room temperature2. In the FeAlB materials, the magnetostriction is a function of the relative proportions of the α-FeAl and Fe3Al phases, as mediated by the Fe2B phase. The materials used for the sensor were commercially available Metglas 2826MB3 (resonator) which had received a transverse field anneal as described previously1 and a FeAlB alloy for the transducer.