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Sensors 2013, 13(1), 106-118; doi:10.3390/s130100106

Influence of Cobalt on the Properties of Load-Sensitive Magnesium Alloys

* ,
Institut für Werkstoffkunde (Institute of Materials Science), Leibniz Universität Hannover, An der Universität 2, D-30823 Garbsen, Germany
* Author to whom correspondence should be addressed.
Received: 1 November 2012 / Revised: 12 December 2012 / Accepted: 19 December 2012 / Published: 21 December 2012
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Germany 2012)
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In this study, magnesium is alloyed with varying amounts of the ferromagnetic alloying element cobalt in order to obtain lightweight load-sensitive materials with sensory properties which allow an online-monitoring of mechanical forces applied to components made from Mg-Co alloys. An optimized casting process with the use of extruded Mg-Co powder rods is utilized which enables the production of magnetic magnesium alloys with a reproducible Co concentration. The efficiency of the casting process is confirmed by SEM analyses. Microstructures and Co-rich precipitations of various Mg-Co alloys are investigated by means of EDS and XRD analyses. The Mg-Co alloys’ mechanical strengths are determined by tensile tests. Magnetic properties of the Mg-Co sensor alloys depending on the cobalt content and the acting mechanical load are measured utilizing the harmonic analysis of eddy-current signals. Within the scope of this work, the influence of the element cobalt on magnesium is investigated in detail and an optimal cobalt concentration is defined based on the performed examinations.
Keywords: physical sensors; magnetic materials; load-sensitive materials; Villari effect; magnesium; cobalt physical sensors; magnetic materials; load-sensitive materials; Villari effect; magnesium; cobalt
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Klose, C.; Demminger, C.; Mroz, G.; Reimche, W.; Bach, F.-W.; Maier, H.J.; Kerber, K. Influence of Cobalt on the Properties of Load-Sensitive Magnesium Alloys. Sensors 2013, 13, 106-118.

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