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Magnetic Magnesium Alloys Based on MgZn and SmCo with Sensory Properties

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  • This research is sponsored by the German Research Foundation (DFG) within the subproject E2 “Magnetic Magnesium Alloys” of the Collaborative Research Center 653 “Gentelligent Components in their Lifecycle.” Gentelligent (genetically intelligent) components describe a new kind of machine parts which are capable of collecting, pre-processing, and storing information (e.g., temperature and forces during use of the component).

Abstract

In this article, manufacture of a magnetic magnesium alloy based on the known magnesium alloys AZ91 or ZEK200 together with samarium–cobalt is investigated. The objective of the investigations is to produce an Mg alloy by die casting, possessing both magnetic characteristics and satisfactory mechanical properties with the aim of obtaining an Mg alloy which can be utilized as a lightweight sensor material. Inverse magnetostriction (Villari Effect) is exploited in order to verify the instantaneous operating forces in lightweight structural components made from Mg such as a vehicle's stub axle. The magnetic properties subject to cyclic loading are determined with the aid of a harmonic analyze of eddy current signals. Results show that for an MgSmCoZn alloy, an unambiguous linear dependency exists between the applied mechanical loading and the harmonic's measured values. The mechanical properties of the MgSmCoZn cast alloy have a similar order of magnitude as those of Mg alloys employed in engineering, such as for example AZ91, and thus possess a good standard.

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