Abstract
We have performed a study of the magnetic, magnetoelastic, and corrosion resistance properties of seven different composition magnetoelastic-resonant platforms. For some applications, such as structural health monitoring, these materials must have not only good magnetomechanical properties, but also a high corrosion resistance. In the fabricated metallic glasses of composition , the Fe/Ni ratio was varied (Fe + Ni = 73% at.) thus changing the magnetic and magnetoelastic properties. A small amount of chromium was added in order to achieve the desired good corrosion resistance. As expected, all the studied properties change with the composition of the samples. Alloys containing a higher amount of than do not show magnetic behavior at room temperature, while iron-rich alloys have demonstrated not only good magnetic properties, but also good magnetoelastic ones, with magnetoelastic coupling coefficient as high as for in the (the sample containing only but not ). Concerning corrosion resistance, we have found a continuous degradation of these properties as the content increases in the composition. Thus, the corrosion potential decreases monotonously from 46.74 mV for the , composition to −239.47 mV for the , composition .
Highlights
Wear, fracture, and corrosion are considered to be huge problems in engineering structures, which cause enormous economy loss, and great injuries provoked by the failure of structures and materials
The first result arising from the magnetic characterization is that, from the seven different compositions fabricated, only four (x = 0, 12, 24 and 36.5, where “x” indicates the Ni % at. content) showed ferromagnetic behavior at room temperature
In the search of innovative materials for Structural Health Monitoring applications, we have shown that metallic glasses of composition Fe73−x Nix Cr5 Si10 B12, with x < 36.5 show excellent magnetic, magnetoelastic and corrosion resistance properties that present them as ideal candidates for the aforementioned applications
Summary
Fracture, and corrosion are considered to be huge problems in engineering structures, which cause enormous economy loss, and great injuries provoked by the failure of structures and materials. The most striking examples concern the sudden and unexpected falling of concrete-made civil structures like houses or bridges, in which the reinforcing metallic inner structure turn out to be covered with concrete. This covering of the reinforcing metal makes it impossible to see the true working conditions (see Figure 1). Damage caused in thecaused structures could be of different kinds, such as kinds, such as changes related to(for the materials (forcorrosion example,processes) in corrosion processes) and/or geometric changes related to the materials example, in and/or geometric properties of properties thedefects system, defects or flaws
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